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Alpine KTP-445A Power Pack

Compact upgrade amplifier for your Alpine receiver — 45 watts RMS x 4

198 Reviews | 42 questions - 83 answers

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Overview

Our take on the Alpine KTP-445A Power Pack

Alpine Authorized Online Dealer

More power for your Alpine receiver

Want a simple way to kick up the power of your Alpine receiver? Alpine's "Power Pack" amplifier increases your Alpine receiver's power output to 45 watts RMS power by 4 channels — plenty of power to drive high-performance speakers or keep up with a big subwoofer amplifier.

Product Highlights:

Alpine's power pack is aptly named. It is relatively small but provides dramatic power to your audio system. It was extremely easy to install and place within my dash, out of sight. I Highly recommend you buy one. You won't be disappointed.

David, Pataskala, OH

What's in the Box:

  • Head Unit Power Pack (15A fuse installed)
  • 39" Amp-to-receiver harness (male 16-pin connector on each end)
  • 31" Amp-to-vehicle harness (male 16-pin connector on one end and a female 16-pin connector on other end)
  • 2 Brackets
  • 4 Screws
  • 4 Wire-ties
  • Installation Diagram
  • Online Product Registration
  • Limited Warranty Information
Reviews

Alpine KTP-445A Power Pack Reviews

Average Customer Review(s):

(198 Reviews)

Great product given the application

Anonymous from Fargo, ND on 8/21/2017

Crutchfield Customer Review (What's this?)

I purchased this to power some JBL club speakers in my 2011 Xterra. They sounded good with just the head unit but this really powers them. I didn't spec a high powered system, but this amp definitely made it easy to increase the power going to the speakers. I zip tied it under the dash to one of the supports, the long cables made it pretty easy to free up some room behind the head unit. It was a simple install as well in terms of wiring and not tearing up my interior. Ultimately, if you want an amp for some easier to power speakers in a very convenient package and an alpine deck is what you want, get this.

Pros: Small Versatile

Cons:

Buy it!

David from Pataskala, OH on 8/16/2017

Crutchfield Customer Review (What's this?)

Alpine's power pack is aptly named. It is relatively small but provides dramatic power to your audio system. It was extremely easy to install and place within my dash, out of sight. I Highly recommend you buy one. You won't be disappointed.

Pros: size, ease of install.

Cons: nada

great product

bill from long island, NY on 8/14/2017

i have a 2004 Honda S2000. if your not familiar with the car its a small convertible 2 seater with only door components (no rear speakers), with that being said i wanted something that was small and gave plenty of power/volume with the top down and doing 55+ mph...well this did BOTH...i bouth the alpine UTE-62BT deck a few months ago and while it did an ok job, the wind at highway speeds would leave me desiring more from my music. I installed this and it worked beautifully, plug and play to my deck and added the power i needed to make my music stand out over the wind noise.

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Alpine KTP-445A Power Pack

Anonymous from Dedham, MA on 8/6/2017

Crutchfield Customer Review (What's this?)

It's awesome so small and easy to use and my highs are crisp

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Alpine KTP-445A Power Pack

Anonymous from Cincinnati, OH on 7/30/2017

Crutchfield Customer Review (What's this?)

WOW! This thing is great! Hard to believe so much power comes out of such a compact unit. And the sound is CLEAN and distortion free. I will use it for all my cars. LOVE IT, LOVE IT, LOVE IT!

Pros:

Cons:

Clarity at High Volumes

Fred from Ashburn, VA on 7/24/2017

Crutchfield Customer Review (What's this?)

The KTP-445A power Pack gives fuller Mids and clearer highs than my Alpine Head Unit did at 18 Watts. What struck me the most is the clarity at higher volumes the Power Pack gives. It took me about an hour to install as I mounted the amp on the floor under the center console. In my 2003 Dodge Ram 1500 Hemi there is a plastic piece that covers it. The time consuming part was running the wires from the floor board up to the Alpine Head unit. Once complete it looks flawless! As always, Crutchfield got the Amp to me in 2 days with excellent instructions.

Pros: Price. Compatibility with existing Alpine unit. Clarity of Sound.

Cons: A bit tedious running wires in my ride.

Alpine KTP-445A Power Pack

Anonymous from Richmond, VA on 7/18/2017

Crutchfield Customer Review (What's this?)

I love this thing. So much easier than having to deal with an amp and all the wiring. Just plug and play.

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Great upgrade to an Alpine head unit!

Roger from Jonesboro, AR on 7/1/2017

Crutchfield Customer Review (What's this?)

What can you say with plug and play! Just very simple to connect and get going. Connected to an older CDE-9843 and it really makes it sing.

Pros: Simple install, plug and play

Cons: None yet

Nice for the Price

William from New Orleans, LA on 6/25/2017

This amp replaced a Focal that died a year after its 1 year warranty expired. The Alpine is 1/4 the price, a little smaller, easier to install - and ....drumroll....I really think my system sounds better using it than the Focal Amp. (Maybe I had a bad Focal Amp- I will never know - and Focal never answered my email inquiring about my options on their just off warranty amp). I prefer the harness that plugs into the Alpine amp, rather than screwing in each individual wire (it does take a little soldiering to prep it - but once done it is nice and idiot proof). I have a Wrangler with entry level Focal speakers (that's why I originally went with the Focal compact amp) 40 RMS in front and 60 RMS in the rear (near perfect match for this amp's power). They sound awesome using the Alpine amp - a big improvement over the Focal - and I do not know why. I read another review about limited room to mount an amp in a Wrangler - which is correct. Compact amps (Focal/Alpine/Rockford Fosgate) will fit easily on the wall to the left of the clutch pedal - and all your speaker wire from the sound bar comes out at spot anyway. And although I am upset that my expensive Focal amp died so quickly and that Focal did not answer my email about it, Focal speakers (even these entry level ones) are the best speakers I have ever put into my cars - and I have done this a lot).

Pros: Price, simplicity and design

Cons: Soldiering all your wires to it's plug in harness takes a little time (but once done, it is so much easier to install, uninstall and use).

Nice simple upgrade

Keith from Powell, OH on 6/22/2017

Crutchfield Customer Review (What's this?)

Really wakes up the system.

Pros: Super easy to install. Compact size.

Cons:

That was easy

Sean from Colorado Springs, Co on 6/5/2017

Crutchfield Customer Review (What's this?)

That was easiest amp I have ever installed. I needed a small amp that wouldn't take up a lot of space in my Wrangler and this matched up with my Alpine H/U perfectly. Had to put it in my glove box due to space in the dash but it was worth it.

Pros: Small, powerful...

Cons: None yet

Great amp to add some boost to a factory stereo

Sean from Cold Spring, NY on 5/21/2017

Great little amp and easily tucked away.. My only complaint is that the input leads if your not using RCA's the wire length is way too short.. I had to add wire to the input side so i could tuck the amp away in the dash..

Pros: Small easily hidden... Output side connectors have plenty of length.

Cons: Input side connectors are way too short to allow them to easily tuck the amp away..

Alpine KTP-445A Power Pack

Anonymous from San Juan ca on 5/21/2017

Crutchfield Customer Review (What's this?)

Great plug and play

Pros: Easy to install

Cons:

Stellar product from Alpine

Jeffry A from Longview, WA on 5/9/2017

Crutchfield Customer Review (What's this?)

Just added this to my Alpine CDE-163BT head and it really "made" my sound system. With the Sound Ordinance powered sub and Alpine type R speakers in my Conversion van, I just needed a little more headroom (clean Watts) in my front and rear channels and this very easy to install power amp / booster worked perfectly. My overall car stereo system is now way louder than I'll ever need and clear, without distortion or amp clipping: even if I do turn it up really loud.

Pros: Clean, clear power to drive decent speakers, easy install, cost-effective, no amp clipping: even at high volumes, keeps up with my modest sub woofer.

Cons: None that I can think of.

Amazing!

Cornelius from Pearl, MS on 4/26/2017

Crutchfield Customer Review (What's this?)

I ordered the Power Pack along with the top of the line Alpine receiver. I installed both in my 2004 Grand Marquis and my 11 year-old son and I was blown away at the detail, clarity, and volume that it gave the factory speakers. I can wait until I install my JL Audio front and rear speakers that I have not heard yet.

Pros: x

Cons:

Alpine KTP-445A Power Pack

Marvin from IA on 4/23/2017

Crutchfield Customer Review (What's this?)

A must have

Pros: Smooth hidden install

Cons: None

Alpine KTP-445A Power Pack

Anonymous from Tucson, AZ on 4/20/2017

Crutchfield Customer Review (What's this?)

I can't believe how great my stereo sounds.

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Alpine KTP-445A Power Pack

Anonymous from Columbia, TN on 4/2/2017

Crutchfield Customer Review (What's this?)

Excellent price for what you get. Really pumped up my audio and I love it!

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Alpine KTP-445A

Anonymous from Sanford, FL on 3/30/2017

Crutchfield Customer Review (What's this?)

Has a lot of power for what it is. Plug and play with alpine head unit.

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Nice power, clean sound

John from Florida on 3/17/2017

Crutchfield Customer Review (What's this?)

The unit provides nice clean power and fits easily in the dash with the double din head unit. The wiring harness has plenty of length to give you many placement options.

Pros: Small and easy to install in my Chevy Cruze. This small amp added nice punch to my dash and door speakers. Great bang for the buck! I would highly recommend the Alpine power pack..

Cons: None

Alpine KTP-445A Power Pack

Anonymous from Universal City, TX on 3/16/2017

Crutchfield Customer Review (What's this?)

Excellent product from Alpine. Easy to install. Big bang for your money.

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Alpine KTP-445A Power Pack

Rick from Blacksburg, VA on 3/8/2017

Crutchfield Customer Review (What's this?)

My new Alpine CDE-SM145BT is awesome! But as an afterthought I purchased and installed this amp. It absolutely brought my system to life! No fancy wires to connect and levels to adjust. It's plug and play. Installation took about 5 minutes. I highly recommend this and all Alpine car stereo equipment.

Pros: Simple installation. Great price. Amazing performance

Cons: Absolutely None!

Alpine KTP-445A Power Pack

Brian from Ft Worth, TX on 3/5/2017

Crutchfield Customer Review (What's this?)

Great product! Easy interface.

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Great upgrade

Mike from Missoula, Montana on 2/22/2017

Crutchfield Customer Review (What's this?)

Easy install and works as advertised. Adds some clarity to my Polk Audio speakers.

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Alpine KTP-445A Power Pack

TImothy from Kenosha, WI on 2/16/2017

Crutchfield Customer Review (What's this?)

Lots of Volume, crystal clear louder than my ears can handle. very easy connection with the Alpine 143BTE reciever.

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Alpine KTP-445A Power Pack

Anonymous from Virginia Beach, VA on 2/16/2017

Crutchfield Customer Review (What's this?)

Forget the included instructions...call Crutchfield Tech support and they will give you easier step-by-step instructions. After installation, the amp did exactly what I was hoping it would do...increasing the sound out of the new receiver amazingly!

Pros:

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Alpine KTP-445A Power Pack

Anonymous from Stow, OH on 2/14/2017

Crutchfield Customer Review (What's this?)

When paired with my Alpine 62BT it REALLY brings the music to life. More clean tones and no distortion. Super simple install is just plug and play with an Alpine headunit and tucks nicely in or behind the glove box.

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Worthless

Marc from Auburn, CA on 1/31/2017

Crutchfield Customer Review (What's this?)

Did not notice a difference what so ever

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Crutchfield response on 2/1/2017 Marc, whenever you encounter a problem with anything you purchase from Crutchfield, please contact our tech support team right away. They can help you solve the problem or set up a return within 60 days of purchase. Lifetime tech support comes with every Crutchfield purchase.

Alpine KTP-445A Power Pack

Steve from Boiling Springs, SC on 1/11/2017

Crutchfield Customer Review (What's this?)

Best addition to my Alpine head unit ever! Easy installation, and stout performance! Money well spent!

Pros: Crisp, clean output

Cons:

loud highs, stronger lows

Isaac from Fargo, ND on 1/9/2017

Crutchfield Customer Review (What's this?)

Works great and powers my 6.5" coaxial and 4x6" plate speakers very well. most definitely gained a ton of deposition and much stronger lows. Volume control keeps gaining sound after level 18 without distortion. Seems like 45w rms is accurate

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Alpine KTP-445A Power Pack

Anonymous from Suffolk, VA on 11/28/2016

Crutchfield Customer Review (What's this?)

Works as advertised, just unplugged the harness from the back of my old Alpine head unit, plugged that into the amp, then plugged the amp into the head unit. Since then I upgraded my head unit to a newer Alpine, works just as easy with the new one. Definitely notice the additional power!

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Alpine KTP-445A Power Pack

Anonymous from Woodbridge, VA on 11/24/2016

Crutchfield Customer Review (What's this?)

Excellent addition To the stero in my boat.Well worth the money I paid it .Thank you.

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Alpine KTP-445A Power Pack

joseph from millville, NJ on 11/23/2016

Crutchfield Customer Review (What's this?)

excellent, with an alpine head unit it just plugs in. for the price this can not be beat. easy easy install. artie was most helpful i

Pros: everything

Cons: none

Alpine KTP-445A Power Pack - 2006 4Runner

Kevin from Oklahoma City, OK on 11/21/2016

Crutchfield Customer Review (What's this?)

I totally agree with the other reviews, this is a no brainer! Installed the Alpine KTP-445A Power Pack with the Alpine CDE-W265BT. I would not even include it as a separate step in the installation process, it was so easy. Love the extra kick!

Pros: Too easy to install to not add to the Alpine CDE-W265BT, add just enough kick

Cons: N/A

Alpine KTP-445A Power Pack

Vincent from Angola,new york on 11/6/2016

Crutchfield Customer Review (What's this?)

This little amp really makes a difference

Pros: Easy install

Cons: None

Alpine KTP-445A Power Pack

Anonymous from Pell Lake, Wi on 11/2/2016

This is a no brainer. There is no substitute for WATTS. These are plug and play. This is the second vehicle I have installed these in. Alpine quality is excellent.

Pros: simplicity and quaulity

Cons: they should be cheaper

Alpine KTP-445A Power Pack

Caleb from Tucson, AZ on 11/1/2016

Crutchfield Customer Review (What's this?)

Added great depth of sound, easy install would buy again

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Alpine KTP-445A Power Pack

David from Forest, VA on 11/1/2016

Crutchfield Customer Review (What's this?)

Perfect size for behind dash install and really packs the power for highs. I paired this unit with the Alpine CDE-153BT and couldnt be hapier.

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Great product

Scott from Harmony, NC on 10/30/2016

Crutchfield Customer Review (What's this?)

Perfect size to conceal behind the dash. Seems to work as it should and wiring was simple.

Pros: Nice sleek design, well made.

Cons: It would be nice if there was a power indicator light showing that it is working.

Alpine KTP-445A Power Pack

Aaron from Salem, OR on 10/17/2016

Crutchfield Customer Review (What's this?)

Can't go wrong with alpine!

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Awesome sound system

Terry from Peoria, AZ on 10/14/2016

Crutchfield Customer Review (What's this?)

Back in April 2016 I purchased the Alpine CDE-W265BT along with the Alpine 500KTP445A, Polk 107MM571 front speakers, and Polk 107MM691 rear speakers. I love this combination. Using the EQ adjustments and the fader control of the CDE-W265BT and the awesome frequency response of the Polk speakers (deep solid bass, smooth midrange, and clear crisp yet smooth highs) I have been able to cause a four speaker system sound like it has a high power sub bass included. This 4 speaker system has the same deep rich sound quality as the Alpine powered 5 speaker system (45W x 4 head unit, 200W bridged sub bass) I have in another vehicle.

Pros: I am very pleased with every thing about these components.

Cons: None

Awesome little amp

michael from Lowville,ny on 10/9/2016

Crutchfield Customer Review (What's this?)

Wish I would have got this sooner so easy to hook up plug and play pretty much wish alpine made bigger amps like this

Pros: Ease of hook up small fits anywhere

Cons: None

Alpine KTP-445A Power Pack

T from Lees Summit, MO on 9/25/2016

Crutchfield Customer Review (What's this?)

Just plug and play with a late model Alpine HU. Great and easy upgrade.

Pros: Super easy installation. Just plug and play with Alpine HU.

Cons: None yet

Clear audio

Carlton from Baltimore, MD on 9/21/2016

Crutchfield Customer Review (What's this?)

The Alpine KTP-445A was just what I need to power my aftermarket speakers. After the easy amp install my music library came to life.

Pros:

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This little unit packs a punch!!

Ed from Merrimack NH on 9/19/2016

Installed this unit in my 2014 elantra, 4 new kickers, componets in front doors. Kept factory head unit, as i wanted to keep my sirris sat radio intact without changing antenna. Wasnt easy install, but wasnt too bad either, had to solder all speakers in as oem head unit had no pre amp out . All that said, been using this setup for about 4 months now, no problems, and this power unit can pump it out very good. I am in my 50's and listen to lots of older stuff, all modes sound good, sat radio, cd , and itouch itunes. Did take some time adjusting the front componets, but have gotten used to them. Anybody that gets in and i crank it up will comment on how clear the sound is. Gonna add to my f350 and think i will use this amp/power pack too.

Pros: can stuff it into small places in dash, dont need pre-amp out from head unit

Cons: None yet

Dang

Corey from 805, CA on 9/15/2016

Crutchfield Customer Review (What's this?)

Was skeptical about buying this but I thought I would give it a chance. This power pack is pretty awesome. For me it was a night and day sound after adding it to my vehicle. I recommend the power pack.

Pros: Loud. I don't have to turn my volume up too high. Sounds great. Very easy to install, plug and play.

Cons: None

Great sounding small package

Mike from Texas on 8/28/2016

Crutchfield Customer Review (What's this?)

I bought this to go along with a head unit that I bought new install on a 94 Corvette very little I'm really happy with the sound and the ease of installation

Pros: Small-size lots of sound easy plug-and-play perfect match to an Alpine head unit

Cons: None

Alpine KTP-445A Power Pack / Polk Audio db651 / Polk Audio db5251

Ot from Orland, CA on 8/2/2016

Crutchfield Customer Review (What's this?)

Ordered this Amp along with Polk Audio db5251 Component Speakers for the Fronts and Polk Audio db651 to match my Alpine 143bt Head Unit for the Rear of my 2003 Toyota Sequoia, showroom condition w/ 45,000 miles. The installation was a bear I had read. I am a perfectionist and spent 4 days running all new wire and bypassing the OEM Loom. It was necessary to remove all door panels and center console, door sills etc along with a very creative Front Speaker installation. Once completed the results were fantastic. Rarely had I heard the OEM Rears and very non responsive OEM Tweeters. The addition of the Alpine Amp was smooth as glass once the interior as well as the Console were removed. The combination of all was dramatic. The Polks sound great, the tweeters were very easy to mount in the Factory position and And the Rears were a piece of cake to install. The front Bass Speakers took quite some time, thought and customization. The outcome was incredible. The Polks along with the Amp and HU brought out the best of everything be it BT, Thumb Drive etc. I am now hearing the finer highs and the Bass after minor HU adjustments made the Interior sound like my home theater. A great pairing of products.

Pros: Excellent sound quality, easy install ( excluding the modifications to the OEM speaker brackets ). Extremely Happy with my purchase from Crutchfield which is the norm. If you haven't dealt with Crutchfield before do yourself a favor and go for it. Superior customer service and support.

Cons: Tough installation only due to OEM brackets.....other than that Plug and Play and Enjoy.

Great bank for the buck!

Dana from Sioux Falls, SD on 7/8/2016

Crutchfield Customer Review (What's this?)

It really couldn't get an easier than this. The amp took about 30 seconds to install. Sounds great and adds a little punch to your system.

Pros: Easy to install

Cons: None

Plug and Play

Chuck R. from Walnut Creek, CA on 7/6/2016

Crutchfield Customer Review (What's this?)

Love it. Too easy to install. No amp wiring kit necessary. Crutchfield supplies the wiring harness and installation is a snap. Unit pushes four 5X7's in my Freestyle full bandwidth perfectly with no heat issues at all. Fits perfect with my Alpine head unit and the sound is very well balanced.

Pros: Small Easy install (too easy) No amp wire kit needed (saves money and work neede to install = none) Plug and play Sounds awesome

Cons: None

Great product

Carl W. from Hixson, TN on 6/20/2016

Crutchfield Customer Review (What's this?)

Great products, receiver, amp and speakers

Pros:

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The difference is night and day.

Brian from Cape Coral, FL on 6/12/2016

I am beyond pleased with this amplifier. I'm running an Alpine ilx-007 deck, and a set of type R 6 3/4's. The sound was good off of the alpine deck, but this little amp has fully filled out the sound in my car. No distortion at any volume, and I have substantially more mid bass than without it. Everything just sounds clearer. I can't recommend this little amp enough.

Pros: Dramatic improvement is sound quality, and performance from my speakers. It's small, so it even fit behind my alpine head unit.

Cons: The length of the wiring harnesses is very long. This is good if you have to run it somewhere other than right behind your head unit. For me, it was a bit of a challenge to cram all that cable into an already tight space.

great upgrade

William from Asheboro, NC on 6/9/2016

Crutchfield Customer Review (What's this?)

Great upgrade to give better, clearer sound

Pros: ease of installation

Cons: none

Alpine KTP-445A with the Alpine CDE-163BT CD Receiver

David from Highlands Ranch, CO on 5/24/2016

Crutchfield Customer Review (What's this?)

I initially bought the Alpine CDE-163BT CD Receiver with two sets of the Infinity REF-8602cfx 6"x 8"/5" x 7" 2-way Speakers to replace my stereo. I knew that down the road that I would end up buying a sub as well just to complete it. After the initial installation of the receiver and the speakers the sound was so much better than the factory. I expected that it would be but I just did not know that the difference would be that great. With that said I was wanting to be able to put a little more power to those door speakers both for now and then when I get the amp. This would give me better clarity now and to also ensure that I don't drown them out down the road with the installation of the sub since the power pack will provide extra power to the door speakers. Well I was definitely not disappointed. The sound quality that was already great only got better once this was installed. I wish that I would have bought it when I purchased the receiver to begin with.

Pros: Excellent addition to the Alpine Receiver Installation was plug and play Sound quality is amazing

Cons: None that I have seen

Nice

Quarrytech from Shippensburg, PA on 5/24/2016

Crutchfield Customer Review (What's this?)

Worked like I expected, not a big amp but gives you that little extra needed to push speakers. Nice being able to hide under the dash and not having to run wires.

Pros:

Cons:

Easy Install in my Camper.

Mark from Land O Lakes, FL on 5/22/2016

Crutchfield Customer Review (What's this?)

Easy Install, "plug and play", as long as the circuit is at least 15 amps.

Pros: Easy Amp Upgrade, often, no wiring required. Always check your fuse. If it is less than 15 amps you need to rewire a new 12v connection to your battery or fuse box.

Cons: This is not a major upgrade. I would say this is almost needed to drive standard Alpine Speakers. OEM speakers would be just fine without this upgrade.

Alpine Amp.

Terry from Willcox AZ on 5/15/2016

Crutchfield Customer Review (What's this?)

Easy install,and preforms great good clear sound and steady power to the speakers

Pros: Can be installed under the dashboard easily

Cons: None

Flat Awesome!

Greg from Peachtree City, GA on 5/12/2016

Crutchfield Customer Review (What's this?)

I combined this with an Alpine 148BT and it took good sound and made it great! I have Polk Audio 651s in the doors, 401's in the dash and 2 351's in each headrest. This was easy to install and brings everything to life. I would highly recommend if you need a good 4 channel amp.

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Nice little amp

Loren from Englewood, CO on 5/11/2016

Crutchfield Customer Review (What's this?)

Truly plug and play with an Alpine head unit, couldn't be easier.

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Alpine KTP-445A Power Pack

Mike O from Hamilton IL on 5/9/2016

Crutchfield Customer Review (What's this?)

I purchased and installed an Alpine head with 4 Infinity speakers to replace the stock system and the difference was night and day. The clarity was the difference that I was looking for and it did the trick. However it was a little short on kick. My advisor recomended the Alpine KTP-445A for its ease of installation and increased volume. I am very happy with the results. There was plenty of room under/behind the head to mount it and the intallation was a snap. The output is much louder yet still sound just as crisp. Don't get me wrong, this won't blow out the windows but your neighbors will hear you comming! If you have already installed your head with the kit the Crutchfield team provided, use 2 butter knives and gently pry around the edges to remove it. This makes the amp intall a breeze.

Pros: More output VERY easy to install

Cons: none

Compact Amazing Amp

Tanner from Green Bay, WI on 4/22/2016

Crutchfield Customer Review (What's this?)

This product works perfect. I have it paired with my alpine head unit and it really makes my aftermarket door speakers shine. So much more clear at louder volumes and a small increase in mid bass as well. pair with any aftermarket door speakers that can handle 40-50 watts rms and your golden.

Pros: quick and easy install. very powerful for how small it is

Cons: Due to limited area behind stereo unit i had to mount it in the glove box. thus it takes up half of my glove box

Big sound

Roch from Hatboro, Pa on 4/9/2016

Crutchfield Customer Review (What's this?)

These power packs work quite well, coupled with my new CDE-152 Alpine Car Stereo it RIPS !!!!! I highly recommend this combination. I plan on replacing all of my speakers with Alpine's as well at a later date.

Pros: big sound

Cons: none

Great amp

Brandon from Atlanta,Ga on 4/8/2016

I just recently purchased this product I was unsure about adding an amp to my car cause all I really need to do was update my speakers in my car and the head which I have done in my past cars which have been Toyota Camry. So when I updated to Memphis speakers and alpine head unit I heard it without and decided why not just try the amp for the first time. So I went back and got the amp installed and it really brought the sound in my Memphis speakers I was very impressed with it. So I recommend if u want something to bring out the sound in speaker this unit work. Also it's a much easier connection if u do it with an alpine head unit as well

Pros: Really bring out the clarity of your speaker

Cons: None

Too many issues to recommend

Tyler from Chico, CA on 4/7/2016

Crutchfield Customer Review (What's this?)

The amp is a great idea, and when it works, works well. Unfortunately, I've had nothing but issues with multiple units. The first unit had a bad wiring harness/socket which cause it to kill power to the headunit at random times. Crutchfield replaced the first unit, and the second unit had the same issue months down the line. Now I'm just out of warranty with a useless amp.

Pros: Simplified wiring, good bump in power to the speakers, small size.

Cons: Reliability.

Great amp!

Kevin B from Gray, GA on 4/6/2016

Crutchfield Customer Review (What's this?)

I am very happy with this little amp. I have had a sound system in every car I've owned since the late 80's This one was by far the easiest to install. In fact, you will spend more time taking everything apart to get your radio. The same day I installed the Amp I covered both my doors with damping material. Mid-bass was much improved on the Kicker KS60 6-1/2" 2-way car speakers I have in the doors. You simply can not go wrong with this amp.

Pros: Easy install Great sound Can hide anywhere It's a Alpine

Cons: I have not experienced any negatives with this amp.

Just Okay for a cheap plug and play amplifier.

John from worcester, MA on 3/19/2016

Crutchfield Customer Review (What's this?)

The concept of this amplifier is great but the sound quality is just ok. The specifications are not all that great but considering the price I paid, its not bad. I'm comparing this to the previous Sony MEX-XB100BT I had in this car until it stopped working so the Sony is the baseline. I have this Alpine Power pack running off an Alpine CDE-163BT CD reciever. They both make my Pioneer TS-A874M come alive and get the best sonic reproduction out of them. The Alpine has 45 watts a channel RMS and 90 watts max and the Sony has a built in 40 watts a channel RMS and 100 MAX so they are pretty evenly powered. To me the Sony seems to have a better S/N Ratio because I couldn't hear any noise floor with the Sony but I can with the Alpine when the music isn't playing. Its a very low in volume sort of background hiss that is there when everything is quiet. I did however run separate 10 gage power and grounds for this amplifier. Its nice not to have to adjust the gain to the radio because Alpine already did this for you and with the exception of the separate power and ground wires, its truly a plug and play unit with no splicing and running separate speaker wires. It also is small enough that you can find a place behind the dash to store it. Mine is above the glove box stuck to the inside of the dash with double sided tape.

Pros: Small, plug and play with Alpine HU. Powerful and makes speakers sound noticeably better than just with the Alpine 163bt built in amplifier.

Cons: S/N Ratio allows noise floor to be heard during non play with amplifier on.

great option for basic decks

Andrew from bellevue, NE on 3/16/2016

Crutchfield Customer Review (What's this?)

Great upgrade to any alpine deck. Especially ones with very few pre outs

Pros: Easy to install. Plug and play did it myself in just 15 minutes

Cons:

Great little amp

Michael from KY on 2/16/2016

Crutchfield Customer Review (What's this?)

Great amp for what it does. Easy plug and play for alpine receivers... Comes with a good amount of wires so that you can hide the power pack somewhere in the dash area. I had to run a better power cable for mine to power the HU at higher volumes. This little amp will really bring your speakers to life.

Pros: Size, easy install

Cons: None.

another great alpine product

O Mansfield from kennewick, WA on 2/7/2016

Crutchfield Customer Review (What's this?)

This amp works great with my alpine cde 123. Now I don`t have to turn volume up to distortion levels.

Pros: love the size. makes mounting options many.

Cons: none for me

Incredible Sound!

Kelly from Ft. Lauderdale, FL on 2/5/2016

Crutchfield Customer Review (What's this?)

I purchased this product after being dissatisfied with my factory stereo connected to aftermarket speakers I had purchased and installed from Crutchfield. There was simply not enough volume or bass coming from my factory receiver. So, I purchased the Alpine UTE-52BT Digital Media Receiver in combination with the Alpine KTP-445A Head Unit Power Pack 45W x 4 Car Amp, in hopes of improving the quality and volume from my car's sound system. Wow! What an incredible difference this made! Night and day difference! I lost any distortion I was experiencing before with the factory receiver. I'm very happy with this purchase and would highly recommend it for those on a budget and not interested in competition level sound systems. This set up is more the adequate for my needs! My only negative is that this install was NOT really plug and play as so many other reviewers have stated. You still must strip plastic sleeves from wires coming off of connectors from the Power Pack and splice together the wires coming off of the connector attached to your car and use black electrical tape to make sure they stay connected. This was a very time consuming process and took a couple of hours for me to complete. I have zero experience doing this and I was very apprehensive and seriously considered hiring a professional installer. However, after speaking on the phone with Crutchfield tech support, they walked me through the process and eased my concerns of not being qualified to complete the install.

Pros: Night and day sound difference. It sounds incredible and I highly recommended the upgrade for anyone on a budget!

Cons: It is NOT truly plug and play as other reviewers have stated. There is still many wires to splice, connect and tape. Very time consuming and intimidating but, with Crutchfield's tech support, you can do it! I did! Also your iPhone or iPod requires a wired, USB connection. It will NOT work through Bluetooth. This was very disappointing.

Alpine KTP-445A power pack

PaulG from South Carolina on 1/11/2016

Crutchfield Customer Review (What's this?)

This amp power pack made some serious sound attached to my Alpine CD on my Harley Davidson. The 4 5.25 speakers never sounded so good until now. Highly recommended source of small clean power.

Pros: Very compact. Clean sound. Good value.

Cons: None

Easy Peasy!

JScott from Mississippi on 1/6/2016

Crutchfield Customer Review (What's this?)

Very pleased with this amp matched up with an Alpine CDE-SXM145BT installed in a 2012 Kia Soul. This amp tucked perfectly into the dash once the factory unit was removed. Didn't even need to drill any mounting holes! It gave my son a great lesson on why power is a good thing.

Pros:

Cons:

Massive Improvement

Mitchell B from Fresno, CA on 11/30/2015

I have Alpine SPC 610C speakers in the front and 610's in the back, plus a great pioneer sub and an Alpine deck. This little amp has boosted the overall performance of my car stereo to great heights. If you want to be rocking out this is the way to go. It was super easy to install and it fits inside the dash so you don't even have to worry about it being stolen or in the way. Basically I have a fantastic stereo and my truck looks OEM, with this amp being a big part of it. 100% would recommend for anyone looking to add a boost to there stereo.

Pros: Size, Ease of instillation, Power, Quality

Cons: none

Best Decision ever

sarge from Washington on 11/11/2015

Crutchfield Customer Review (What's this?)

Quite possibly the best decision i have ever made in car stereo installation is to get one of these power packs installed with an Alpine head unit!! My Infinity Speakers are rocking off the charts, the RMS wattage per channel definitely helps to offset the giant bass I am producing with my amp and sub, no matter how loud I turn the Sub up I can still hear the crystal clear Highs and Mids produced by my speakers. Don't get me wrong, you do not need this if you do not update your stock speakers in your car, but if you do, you definitely need this product to meet their full potential.

Pros: Amazingly easy to install, easy to hide, fits perfectly behind dash

Cons: None... Even converting my standard fuse from 10amp to 15amp was extremely easy, these should be a bundle option with every alpine stereo sold!!

Nice!

Anonymous from Indiana on 10/21/2015

Crutchfield Customer Review (What's this?)

Good product.Nice easy install,plug n play no need for running miles of wiring.Not looking for a competition block shaking system so this is a nice addition.Cleans up and improves already good sound from Alpine HU.Driving 6x9s and 6.5s nothing monstrous,sounds good!

Pros: Everything

Cons: Nothing unless you are lookinf to build a system with monster subs.Good enough for normal coaxes.

Sounds great

wkc from North Carolina on 10/14/2015

Crutchfield Customer Review (What's this?)

I put this in my 2004 Jeep Wrangler along with an Alpine Head unit (Alpine CDE-HD149BT CD Receiver) and I made the unit sound great. It is not going to "thump" the neighbor's house but it will help you hear the radio when the top is off the jeep. Easy to install, hard to find a place to hide in a wrangler. As of right now it lives in the glove box. I am looking for any ideas on where to mount it, and how, on this year jeep.

Pros: Easy install, sounds great.

Cons: None so far

Must have for the money

Brad from Illinois on 9/28/2015

Crutchfield Customer Review (What's this?)

Great idea Alpine!

Pros: Easy installation, plenty long wire leads for remote location, small and powerful

Cons: none

Great buy!

PMartin from Clayton, North Carolina on 9/15/2015

Crutchfield Customer Review (What's this?)

A Great addition to my alpine ilx-007 unit. Powerful with clear sound.

Pros: Very easy and quick installation. small enough to fit behind the head unit.

Cons: None, very happy with this power pack unit.

Yes - Love it!

Matt L. from Pennsylvania on 9/4/2015

Crutchfield Customer Review (What's this?)

Alpine - I love this! No more power wires to the battery to amp your internals. I Really didn't think this little power pack would live up to its ratings. I had a 4 channel Memphis amp 50 x 4, and I feel I get better sound quality (New Alpine deck probably helps as well) out of this little dash mounted 45 x 4 power pack. I will never run a full 4 channel amp again!!

Pros: Easy to wire, hides in the dash, no wire to the battery needed. Worth every penny

Cons: Haven't found one

Love it !

Jwalenta from Michigan on 8/30/2015

Crutchfield Customer Review (What's this?)

Made a huge improvement on the boat. 5 minute install. I'm surprised how much cleaner the sound is at moderate volume, which is our typical level. Worth twice the price.

Pros: Super simple install Much improved sound Takes up very little space

Cons: None so far

Nice compact amp

Scott from Pennsylvania on 8/19/2015

Crutchfield Customer Review (What's this?)

Clean sound, easy install.

Pros: compact size, plug and play

Cons:

Perfect fit

RollN1 from Boulder, CO on 8/17/2015

Crutchfield Customer Review (What's this?)

When I first got the amp I honestly was surprised how small it was. It's so small that the bundle of wires that comes with it are actually bigger than the amp itself haha. I installed it into my 85 4Runner tucked under the head unit. Once you tuck in the wires it can literally fit almost anywhere you could imagine. Currently I have it pushing a pair of Kicker 4" in the front and kicker 5 1/4 in the rear. Without the compact sub reggae, rock and classical sound amazing though rap and other genres that have a lot of bass need the additional sub to really enjoy the beat. I installed a Kenwood ksc-sw11 under the front passenger seat and the system sounds amazing, exactly what I wanted thanks to Crutchfield!

Pros: Super small and powerful and its easy to mount/hide.

Cons: Hiding the wires was the only problem I ran into other than that the product is solid.

Alpine KTP-445A Power Pack

Charles from Kentucky on 7/28/2015

Crutchfield Customer Review (What's this?)

Easy to hook it up plug and play. I would buy this again with my Alpine deck.

Pros: Make my JL speakers sound great in my Ford F250 2005 Crew Cab

Cons: None

alpine ktp-445a

Mike from roseville, MI on 6/20/2015

This amplifier is amazing. The sound quality with the cde-164bt, type r car speakers front spr -6.34 and spr -68 in the back. Would never expect anything less from alpine.

Pros: Brings out the full quality sound from the cde-164bt and the speakers sound nothing short than awesome.

Cons: Not a one

Big difference in small package

RayMan from Oregon on 6/14/2015

Crutchfield Customer Review (What's this?)

So, amping up is the way to go with any deck installation. Remember to look at the RMS on the head unit and not the peak watts. I paired this with an Alpine HU with 18 W RMS and it's a pair of Kicker 6 3/4 2 way speakers and what a big difference to the sound. You can't install nice speakers and expect the HU to power it. Amp up and this amp is super easy to install and it is hidden behind my HU out of view.

Pros: Portable. Easy install. Good length of wiring to stash the unit somewhere behind your dash.

Cons: None.

Super easy install

BenW from California on 5/31/2015

Crutchfield Customer Review (What's this?)

This is probably one of the easiest car audio installs I have ever done. It took me way more time to find the space to put the amp in the dash of my MINI Cooper. It is literally plug and play. Nice improvement in sound quality at all volumes. I've had my Alpine head unit for a while, which I love for the iPod integration; I'm able to have a huge part of my music library right in my car. I have upgraded the speakers in my MINI and added a Bazooka subwoofer, but have been reluctant to add an amp due to the limited space and lack of willingness to tear apart my interior to install under the seats. Then I read about this amp and all the great reviews and knew I had to give it a try. With the limited space of a MINI I knew it would be a challenge to find someplace in the dash but it fit behind and above the head unit just fine with a little manipulation. I just used some zip ties for the amp and the extra wire and it is in there pretty securely. Anyone who has an Alpine head unit or contemplating upgrading to one should just get one.

Pros: Easy install, nice sound improvement for an Alpine head unit

Cons: None

worth every penny

TaosFly from Napa CA on 5/24/2015

Crutchfield Customer Review (What's this?)

Installed it yesterday. It is very easy to do. Have a 98 4runner with stock speakers. I couldn't beleive the difference it made in sound quality. It is worth every penny.

Pros: Easy install. Takes about 15 minutes. Don't need a bulky amp in your trunk. Sounds great.

Cons: Can't control the gains. So you can't tinker with it.

Alpine KTP-445A Power Pack

Anonymous from Auburn, IN on 5/11/2015

Crutchfield Customer Review (What's this?)

Just what I needed! Perfect plug-n-play with the Alpine head I already installed on my harley last year. Fits right on top inside the fairing and really made a difference. Just enough power to hear the music clearly over my obnoxious pipes.

Pros:

Cons:

A nice unit

Alex from Maine on 4/11/2015

Crutchfield Customer Review (What's this?)

A great way to increase power, quickly and easily. This is a great idea from alpine a tiny plug in amp for their headunits to boost power. The amp definitely boosts power and is very clean sound. The only bad thing is that your alpine headunit has no clue that it is connected to this, which makes it so that any level is louder and unfortunately you have no way to adjust parameters like you would in a true 4 channel amp. I love to setup my amps so that at max volume on the headunit there is no distortion from the amps. Giving me the entire volume range.

Pros: Superfast installation, decent power with much better overhead than factory unit.

Cons: No adjustments.

Alpine KTP-445A

Anonymous from Elmwood Park, NJ on 3/30/2015

Crutchfield Customer Review (What's this?)

Great amp. Plug in and play. Makes my stereo and speakers sound great in my 2010 Jeep Wrangler JK.

Pros: Simple to use and install .

Cons: None

Good sound

99 max from Shannon, AL on 3/22/2015

Crutchfield Customer Review (What's this?)

Sounds very good for such a small package

Pros: Fits anywhere

Cons: None

Make Mine ALPINE

Mark from Texas on 3/8/2015

Crutchfield Customer Review (What's this?)

With the Alpine head unit, Alpine R series speakers, This amp is just what is needed to make the sound come together, Keep in mind the system is in a Kenworth W900l And sounds great, Thank you Crutchfield

Pros: Plug and Play

Cons: none

added power to my 52BT

KJ from Nc on 3/7/2015

Crutchfield Customer Review (What's this?)

Great add on power. Really makes the sps-517 in the doors jump.

Pros: Easy to add

Cons: Zip

So easy!

Reuben from Boston, MA on 2/16/2015

Crutchfield Customer Review (What's this?)

This thing is such an easy addition to improve your car audio. I've installed several larger amp set ups of varying complexity in mine and my friends cars over the years but I gotta say, I don't think I'll be doing it again anytime soon. This class D amp does a great job for its size and its ease of installation. Literally, all I had to do was splice an Alpine wire harness to the car head unit harness, find a clever place for it and the job was done. So easy and I'm honestly amazed at how much power is produced, I don't even run this thing close to full volume and it bumps the car.

Pros: Easy Sufficient power

Cons: Would be difficult to add a sub

Super simple

Ken K from New Mexico on 2/9/2015

Crutchfield Customer Review (What's this?)

This amp is a great addition for those of us that have small cars and who may not want to run additional wires. This really boosted the sound quality of my Alpine head unit. The sound isn't super crisp on the highs but it is warm overall. I think that you sacrifice some quality for the easy installation and use.

Pros: easy to install, small form factor

Cons: Not super crisp highs but its good for what it is.

Alpine KTP-445A

maui808 from Kaneohe, HI on 1/26/2015

Crutchfield Customer Review (What's this?)

Bought this along with the Alpine CDE-154BT. They work great together and makes my 6x8's come to life.

Pros: Plug and play. No more RCA's, power or ground to run. Super compact and everything fit behind my head unit in my 2001 Tacoma.

Cons: Extra long wire harness. But I just stuffed it all behind my HU.

Alpine KTP-445A

M Byrd from Anchorage, AK on 1/24/2015

Crutchfield Customer Review (What's this?)

Installed this power pack with my Alpine digital head unit and Alpine SPR-68 and it all sounds perfect.

Pros: Very easy installation and fits nicely in my dash behind the head unit.

Cons: No cons. Absolutely love it.

Alpine KTP-445A Power Pack

EN from CA on 1/20/2015

Crutchfield Customer Review (What's this?)

Just installed new speakers before adding this amp. The sound before adding the amp was good, but when I plugged in this amp the sound was great. And when I say plugged in it was just that easy to hook up, I spent a total of about 20 minutes and most of it was to find a location for the amp.

Pros: super simple install, Great little amp adds some needed punch

Cons: none

Great addition to your Alpine HU order

Chumly from San Diego on 1/3/2015

I ordered this w/ the 154BT HU & 6.5" S-model components for a '95 Miata. I test ran just the HU and speakers then put the top down and went for a spirited drive. Muttered, "decent", then went back for the amp install. Amazing and instant improvement! My install wasn't plug-n-play as it should be; I'm complicated. The Miata doesn't give you much space and the wires are quiet long. I cut the harnesses down and soldered and heatshrinked so it wasn't so cluttered and stuffed. I'm sure it'll get warm. I also put the OEM adapter on this amp instead of the HU, again less clutter. I ran a fused 14G wire from the yellow to the battery in the trunk. It takes 10min and easier than getting to my fuse block just to see if it's 15A or not. There is a 15A fuse on the amp, a 10A on the HU, & I used a 20A on the bat run so they are individually protected. NA Miata owners, this fits nicely behind the metal bracket behind the HU, like it was meant to be there.

Pros: -Must have with any Alpine HU install w/ aftermarket speakers. Install "can" take 30 minutes max and really is plug-n-jam. -Priced very fairly given other options can easily double the cost once installed and done.

Cons: -Don't know what the 2 hold-down brackets are for. No hardware for them and instructions just show how to plug it in. -Connectors are TIGHT. They do secure nicely but takes a lot of effort. Do this part before working in tight spaces.

Alpine KTP-445A Power Pack Reviews

james from New Jersey on 12/31/2014

Crutchfield Customer Review (What's this?)

works great easy to install

Pros: easy to install

Cons: none

Clean sound in a small packae

JH3 from New York on 12/29/2014

Crutchfield Customer Review (What's this?)

Very easy to install in with a new alpine ine-w940, just plug and play. Greatly improved the sound in a complete car stereo upgrade. Installed in 4th gen 4runner in the small compartment inside the glovebox.

Pros: easy to install, sounds great.

Cons:

Alpine KTP-445A Power Pack

Anonymous from jonesboro on 12/24/2014

Crutchfield Customer Review (What's this?)

Plug n play...more than enough power for my little system

Pros:

Cons:

Impact

RichOne from Louisville,Kentucky on 12/15/2014

Crutchfield Customer Review (What's this?)

Added a little more depth and clarity to the sound.

Pros: Easy to hook up

Cons: About 30 dollars less on two other sites

Alpine KTP-445A Power Pack

greg from charlotte nc on 12/7/2014

Crutchfield Customer Review (What's this?)

The Alpine KTP-445A Power Pack was .

Pros: Worth every penny and was super easy to install.

Cons: None

Alpine KTP-445A

Larry from Kauai Hawaii on 11/15/2014

Crutchfield Customer Review (What's this?)

very easy to mount and simple connect to the Alpine 149BT receiver..Boosts as it's advertized..When I got the 149BT Radio/CD player I was dissapointed at the low wattage...it barely tickled the JBLs in my truck. this unit should have been built into the alpine receiver for the cost of it.

Pros: Nice unit

Cons:

Definitely the "secret sauce" in my vehicles

doa70 from NJ on 10/16/2014

This has just enough punch to take your base head unit that does less than 20w RMS and adequately feed speakers capable of handling over 80w RMS. Sound quality is excellent, it's not loud, just a great, full sound. I've added this to two all Alpine systems now and it is definitely the key piece of gear that brings it all together.

Pros: Size, good heat dissipation, not over powering, price

Cons: None yet!

Nice punch for the price

Aaron from Albany, NY on 10/8/2014

Crutchfield Customer Review (What's this?)

Added a good deal of punch and volume to my system. A good complement to my Alpine deck, and well worth the price. Installation was easy and straightforward. I was even able to mount it in the dash behind the stereo, though it was fairly tight.

Pros: Good value. Easy install.

Cons: None

Alpine KTP-445A Power Pack Review

Ben from Manchester, CT on 10/6/2014

Crutchfield Customer Review (What's this?)

It sounds great. Its small and will fit in a lot of places. I dont have a lot of room in my truck so this fits well. As a kid I always wanted some alpine gear, now I have some, now I am happy. I have it paired with alpine 6.75s and alpine 5.25s.

Pros: Fits behind my head unit in the dash of my 02 dodge dakota. Its small, stays cool, it doesnt overheat and shut off due to being inside my dash. You could mount this easily in a glove box or small console.

Cons: None really. Check your system, it required a larger power source then the 10a power source dodge provided. My alpine head unit and this require at least a 25a fuse.

Couldn't Be Any Easier

Lee from Bonners Ferry, ID on 9/17/2014

Crutchfield Customer Review (What's this?)

I purchased this amp to compliment the Alpine CDE-143BT I purchased to replace a older Alpine head unit. Installation could not have been any easier. The wiring harness only connects one way, so mixing up the wiring is not a concern. Alpine supplies more than enough wiring to place this nearly anywhere in your dash and its compact size is perfect. I did however, go back and forth between having the speakers driven by this amp and just the head unit and did not noticed a huge difference. That may be due to the speakers (4 Pioneer TS-G1644R 6.5"'s), although they are rated at 40 watts RMS and this amp is rated at 45 watts RMS, which should be pushing them quite well. just wish I knew how to test the actual wattage at my speaker connections to ensure the amp is working correctly.

Pros: Easy to install, no need for extra wiring as with other amps. Compact size easily fits inside of my dashboard. Lots of length to the wires for ease of placement. Ample power to push most entry level speakers.

Cons: Cannot tell if amp is on or not as there is no indicator light. I guess that is because it's intended to be installed out of sight in your dash.

Decent and seamless with alpine HU

bkelly from ATL on 9/15/2014

Crutchfield Customer Review (What's this?)

I bought this to add a bit of oomph to the Alpine CDE147BT HU I bought last year (this model is discontinued). I like that it's compact and has seamless connectivity to my HU. I was able to easily place it behind the temp control panel in my 4Runner-- it has little heat generation so you can stuff it pretty much anywhere. The power it adds is not substantial-- ~4db overall-- but i didn't want it to blast music, I just wanted to have my factory speakers push it out in all ranges a bit more at lower volumes. This amp it does. I'm happy with the sound-- if I wanted improvement I'd have to replace the factory speakers, which I'm unlikely to do with this vehicle. In general it has added depth and clarity to what is already a great sound from this head unit. I can't vouch for its overall power for those looking to blast the neighborhood from their car-- if I tried that I'd likely blow my factory speakers. But if that's what you're looking for, I'd start shopping for hearing aids since you're gonna need them, boyo. Installation was a breeze-- it's completely plug and play with alpine head units.

Pros: Easy to install Price Very small footprint Decent power boost for existing HU

Cons: None experienced at this point (1-2 months in)

Easy Upgrade

momule from Rural Eastern Missouri on 8/28/2014

Crutchfield Customer Review (What's this?)

Installation was as simple as plugging the amp in. The results far outweigh the cost and make my 4 Polk 6X9 speakers shine. The length of the provided wiring made it possible for me to place the amp in the glovebox which was not ideal but space behind the dash on my 02 Ranger is very limited. The improvement in sound is enough to make me hesitate to spring for a subwoofer.

Pros: Too easy to install - plug and play and forget This one is matched to many Alpine head units - do your homework Best for those who want better sounds in the car...maybe not for those who need to rattle rivets and spot welds loose.

Cons: zero cons...this is just a good deal

Alpine KTP-445A Power Pack

kevin m from oakdale, ca on 8/19/2014

Crutchfield Customer Review (What's this?)

excellent amp, plug and play for alpine head units

Pros: good clean sound. doesn't get hot

Cons: none

Great compact Amp

Kevin from South Carolina on 8/19/2014

Crutchfield Customer Review (What's this?)

Really makes my Polks sing out loud in my jeep.

Pros: Easy to install, just plug and play, its that easy.

Cons: none

Sounds great

CaptainWinter from Seattle, Wa on 8/15/2014

Crutchfield Customer Review (What's this?)

Sounds Good, it really does. My car is a Honda Civic Si (2005) with an Alpine Stereo, and factory-installed speakers. My friend has since warned me that the new Power-Pack thing might damage my speakers down the line, something to do with the speakers receiving more power than they are designed for, even if I don't blast the volume. I've had the system in my car a few days now now and it sounds really good. If you don't think about it, or you're concentrating on stirring conversation with whoever else is in your car, you might not notice at first, but when you put on music that was recorded with quality, it sounds great. I should note that I'm listening to music through my ipod, which is connected to the Alpine stereo's USB jack.

Pros: Not expensive for audio equipt Sounds good.

Cons: If your car stereo gets stolen, it's an extra bummer. Not a night-and-day contrast to the factory install.

Great upgrade for 2004 Miata

Eric from Fresno, CA on 8/8/2014

Crutchfield Customer Review (What's this?)

This is a beefy little mighty-mite. I shortened the wiring harnesses (using solder and heat-shrink tubing) and padded and mounted the unit to some of the dashboard framing to the left of the glovebox in my 2004 (non-Bose) Miata. I connected the unit to an Alpine UTE-52BT head unit and ran the yellow battery lead over to a vacant 20-amp "audio amp" fuse socket in the under-dash fuse panel using an Add-a-Circuit adapter from Pep Boys, for power. This thing really woke the stock speakers up; they play loudly and with excellent bass. Absolutely no complaints at all.

Pros: Compact and powerful. Easy to connect.

Cons: Not required, but to save space and lower impedances I chose to shorten the wiring harnesses to make it fit better, but that was no big deal.

Great when paired with X008U Headunit!

kelbyv from Lubbock, TX on 8/7/2014

Crutchfield Customer Review (What's this?)

Adds great sound quality to any Alpine headunit. Easy to install! Makes the radio sound that much better! Who doesn't like louder, better quality sound?

Pros: Easy install. Inexpensive compared with other 4-channel amps.

Cons: None!

Alpine KTP-445A Power Pack

Kevin from Fort lauderdale, Florida on 8/4/2014

Crutchfield Customer Review (What's this?)

This is the perfect amp to seriously upgrade your system. It was simply plug and play with my alpine head unit. Up and running in under 10 minutes. This is not for thumping the trunk but for serious and very clean can only hear the music sound!

Pros: everything....its just right!

Cons: None, its just amazing.

Alpine KTP-445A Power Pack

mtrops from Wrightwood, CA on 7/28/2014

Crutchfield Customer Review (What's this?)

Perfect for my truck, gives my new Alpine stereo just the right amount of punch and makes the music much more dynamic. Reasonable price

Pros: Ease of installation and being able to hide it behind the dash

Cons:

Very easy to install. reasonable price for the output.

Anonymous from Oklahoma City, OK on 7/26/2014

Crutchfield Customer Review (What's this?)

Very user friendly and helpful instructions. Makes install a Breeze.

Pros: Good price. Great product.

Cons: No Cons

So easy it scared me..

DJ Puppy from Kalamazoo Mi on 7/25/2014

Crutchfield Customer Review (What's this?)

Way to easy to get the additional sound out of my Alpine CDE W235BT unit. I have a very basic install with 4 Alpine speakers so I was not sure the Amp would make a big difference. Wow it really does. I need to turn it up a tad to get full effect but not a problem. The first one I got with the head and speakers had issues. One phone call, 3 minutes on the phone and a new was delivered a day and a half later with return shipping stuff. Then came the reinstall....5 minutes back in business.

Pros: Easy to plug into Alpine Head. Great clean sound. Small with long wires for each side; easy to bundle or leave long for remote install. Oh and the great Crutchfield service and support. Basic simple instructions.

Cons: none....

awesome system option

Michael from Harrisonburg, VA on 7/22/2014

This was a great purchase and would recommend this to anyone wanting to upgrade their stereo system.

Pros: Plug and play, easy to install. No headaches that come with a lot of products.

Cons:

Really adds Punch!

Paul V from Sierra Vista,AZ on 7/19/2014

Crutchfield Customer Review (What's this?)

Really adds punch to your music, simple plug-in connections makes for easy installation. Very reasonable price for amount of watts.

Pros: Simple and powerful

Cons: None

Alpine KTP-445A Power Pack

Seth from Richmond, VA on 7/16/2014

Crutchfield Customer Review (What's this?)

Sounds great and love the simple installation...just plug and play.

Pros: Sound quality and ease of installation...

Cons: none

not just plug n play

jack from trevose,pa on 6/30/2014

Crutchfield Customer Review (What's this?)

I added the Alpine power pack amp to my alpine HD radio HU , with four new Polk audio 6.5 coaxial speakers the new sounds in my 1999 camaro are impressive for the little amount of money invested,even with the top down I still get rich powerful sound, I think a sub woofer will be my next move to add that deep bass richness we all desire.the only con to the install was the fact that it wasn't an easy plug and play as advertised, if you own a camaro with the factory Monsoon stereo you have to remove the factory amp and run all new speaker wires it was a lot more work than I anticipated ,worth it but still a lot of work!

Pros: Nice sound ,minimum investment.

Cons: Not an easy plug n play install

Powerful Amp

Clark from Searcy, AR on 6/15/2014

Crutchfield Customer Review (What's this?)

This amp connected easily to my new Alpine UTE-52BT. It is great not running the amp to the battery through the firewall. It makes a big difference in the clarity and power of the sound. I do wish it had a gain control. Works great though.

Pros: Easy installation and really boosts sound.

Cons: I think the amp would benefit from having a gain control on it.

Alpine Power pack KTP-445A

Gutierrez from Longview, Texas on 6/8/2014

Crutchfield Customer Review (What's this?)

Great addition to my CDE-151 receiver, much better sound quality, easy to install, easy to understand wiring diagram, need to replace oem rear speakers on my truck now to get full benefit of power pack, Will be getting back to you guys on rear speakers. Thanks Crutchfield.

Pros: ease of installation, great instructions, sound quality and power, great buy for the money

Cons: used double sided tape on mine also to mount directly under dash on floor board. Purchased plastic flexible conduit to cover excess wire to unit, much better look and protection of wires.

Alpine KTP-445A Power Pack

WWB III from 70774 on 6/5/2014

Crutchfield Customer Review (What's this?)

Great product, easy install, long harness came in handy to remote mount

Pros:

Cons:

Alpine Ktp-445A

Michael from Hartford City, IN on 5/28/2014

Crutchfield Customer Review (What's this?)

Adds a great punch to my system at an affordable pirce.

Pros: Super easy and fast installation.

Cons:

Easy to use plug and play

Wildcat1 from Paducah, KY on 5/24/2014

Crutchfield Customer Review (What's this?)

Plug and play can not get any easier. Really brings life to your speakers

Pros: Plug and play, not very big

Cons: None

Small Amp With A Lot Of Punch!

Mike S. from Fayetteville, NC on 5/23/2014

Crutchfield Customer Review (What's this?)

Great addition to my Alpine CDE-153BT radio purchase. The long wiring harnesses actually assisted in my installation. Without the extra length of these harnesses, I would have had to add extension wires to my H/U wiring harness. The power and clarity my H/U produces is amazing! I wish I had installed the H/U without the amp attached first so I could compare the output of the H/U before and after attaching the amp.

Pros: Quick connects are very convenient for installing harnesses. Small footprint made installing amp in hidden location quick and easy.

Cons: Including some double sided tape with this unit would have been handy. I could not figure out how to use the enclosed brackets so I purchased some thick double sided tape and taped the unit down in its final location.

Good Stuff !

Brian H from Bluffton SC on 5/22/2014

Crutchfield Customer Review (What's this?)

Easy hook up, good power, excellent value. Wires are wayyyy too long but no big deal. All Alpine stuff makes it real easy and very inexpensive for what you get.

Pros: Good power, Easy connection.

Cons: A sub channel would be nice.

Awesome upgrade

Greg from Charlotte, NC on 5/13/2014

Crutchfield Customer Review (What's this?)

Excellent addition to my alpine radio. Runs a set of JL audio component speakers in the doors. Night and day difference. Really made these speakers shine. A must have for alpine radios to get the most out of your speakers.

Pros: Small. Mounts nearly anywhere. Just the right amount of power. Great value IMO

Cons: Got nothing

Good value amp

Gil928 from Kemah, TX on 5/6/2014

Crutchfield Customer Review (What's this?)

decent value for the money.. Don't buy this amp if you're looking for a high performance competition sound.. It did, however, upgrade my stock stereo to a very satisfactory level.. I would purchase again.

Pros: install was a snap with plug and play (paired with Alpine UTE52BT)

Cons: For my application, way too much wire. I did not want to cut and splice, so I've bundled them all together behind the dash.

Would buy again without thinking twice!

g_boy91 from Brownsville, TX on 5/5/2014

Crutchfield Customer Review (What's this?)

I took a leap of faith in ordering this little amp. I had previously upgraded all my speakers and added a subwoofer in my '02 Ram single cab. I already had a 750w RMS amp, so I didn't feel like adding another one and doing all the wiring and use power and ground distribution blocks. It's just more work and way more expensive that way. Instead I decided to add the KTP-445A to my CDE-102 headunit and I am glad I did. My rear cabin speakers are rated at 45 watts and sound great. My door speakers are underpowered by 55 watts, but sound way better than they did before. I noticed things in some songs that I hadn't heard before. I used to play my music at 21 of 35, but now I keep it at 19. It sounds punchier and louder, but clear. Once I adjusted my crossovers and other settings, my speakers blended in perfectly with my sub. Had I known about this before I would've done it sooner. I didn't know what to expect, but now I can honestly recommend this to anyone. Hardest part is figuring out where to mount the amp. Crutchfield had a great price and I recieved the package on time as promised.

Pros: Ease of installation, Reasonably priced, Convenient, Build quality, Sound quality, Compact, Noticeable improvement

Cons: Harnesses are a little tricky to plug in. You just have to play with them and wiggle them until they click.

Good power, small size.....really?

EMTJJP from Dalton, MA on 4/21/2014

Crutchfield Customer Review (What's this?)

Bought this Power Pack to go with my 143BT for the reason that I did not want to install another large amp in the back of my 4Runner (due to storing my mountain bike in the back). I will admit, I had a hard time believing that this little package was going to supply enough power to make my Infinity components sound good. Heck, I come from the days where the heat sink on your amp was twice the size of the amp itself! No more, this unit delivers the clean and efficient power that I need to keep up with my JL audio 10" DVC sub. The connection was simple, and the wires were sufficient length. My only gripe is that the connections require a little "push" to ensure they are seated. Make sure you push in until you hear the "click".

Pros: Small size, good power, easy install.

Cons: Loose connector if you don't take the time to ensure you "click" them in. No gain control on the amp. Like I said, I am old school, and am used to adjusting my amp gains. I just need to get used to not having one. Not a big deal.

Perfect amp for an Avalanche

Blaze from Morgantown, PA on 4/15/2014

Crutchfield Customer Review (What's this?)

I have a 2013 Chevy Avalanche and the back seats lay down extending the length of the truck bed which is great but does not provide any room for amps or sub woofers in the back seat. There is very little space under the front seats so this little Alpine amp fit perfectly under the center console.

Pros: It is small and easy to fit in places with little space. The harnesses were plug and play with the Alpine head unit and the custom harness that came with the Alpine head unit from Crutchfield. Wiring literally took 20 seconds. The sound range and output levels were impressive for such a small package. A definite pro is that you don't have to run separate fused power to the battery like the bigger units.

Cons: Power is 45x 4 which is not heavy duty but for the average audiophile, it is sufficient.

Nice power

lcseds from Durham, NC on 4/4/2014

Crutchfield Customer Review (What's this?)

Matched this up with an Alpine CDE-SXM145BT in my 2013 Mustang. Super install with just a few plugs. No splicing needed. This really lit things up. Good, strong power without having the normal distortion on the low end. Seems to me that as easy as this is to install, it's a no brainer to buy this for your Apline. I did not need to change any fuses either. Car electrical circuit runs this without issue.

Pros: Really adds some punch

Cons: None!

Alpine KTP-445A Power Pack

Anonymous from United States on 4/4/2014

Crutchfield Customer Review (What's this?)

Works pretty good. But at higher volumes it will make the type s speaker scream and start distorting even though they are suppose to be rated up to 75 watts rms.

Pros: Install is a breeze just plug and play only connections are to factory adapter plug which is also plug in after you are done. Size is micro small for an amp

Cons: No adjustments at all. None.

Nice addition 5 stars

David G from Odebolt IA on 3/31/2014

Crutchfield Customer Review (What's this?)

Just the right kick for my Alpine CDE-143BT. Small and easy to hide. Plug and play at it's finest

Pros: Long leads for easy locating just about anywhere under the dash.

Cons: Haven't found a con.

WORTH EVERY PENNY!!!

WarrenW from New Jersey on 3/28/2014

added to Alpine 143bt pushing Kicker KS5.25 speakers...the sound clarity is BRILLIANT. perfect upgrade for my 99 Wrangler. everything just comes alive...still can't believe the sound...just WOW

Pros: easy install plug and play small unit easy to hide easy 45 watts per channel perfect upgrade for those who want a nice little boost

Cons: none that I can think of

Little power pack

Falcon3 from Atwater, CA on 3/19/2014

Crutchfield Customer Review (What's this?)

Lot of clean power in a compact package

Pros: Compact size, real clean power, easy to wire up

Cons: None

Great Sound

F from Dallas on 3/12/2014

Crutchfield Customer Review (What's this?)

Purchased two units, one for my car and one for my daughter's car. Sound quality is excellent. Installation very easy. Had to return one of the units for a low level hum that developed after it was powered on about 10 minutes that could be heard when the volume was lowered to zero. Crutchfield replaced it with free shipping - awesome customer service! I have owned many Alpine products through the years and this is the first problem I have ever had - plan continue to buying Alpine products in the future.

Pros: Great sound, build quality - awesome customer service from Crutchfield.

Cons:

Awesome unit

Anonymous from Battle Mtn, Nv on 3/4/2014

Crutchfield Customer Review (What's this?)

If your alpine is new enough to use the power pack buy it! Well worth the money, I would buy it again with out a second thought, it has just enough power to keep the door speakers up with a sub, and its clean power and such a easy install!

Pros: Easy install, lots of power for such a small unit, plug and jam lol!

Cons: None if your thinki,g about it just get it, no regrets here!

Little amp good sound

Michael from Canyon Tx on 2/28/2014

Crutchfield Customer Review (What's this?)

I needed just a little more power out of my Alpine head unit but I am very limited on space in a jeep TJ. This fit the bill perfect

Pros: Small size, easy to install

Cons: Included harness is a little long

Alpine KTP-445A Power Pack

mark ny from Poughkeepsie, NY on 2/24/2014

Crutchfield Customer Review (What's this?)

Great little amp more than twice the power my head unit was putting out. .really helped the bass out...just plug in and go doesn't get any easier than that

Pros:

Cons:

Couldn't have been a better product for what I needed

Josh from San Diego on 2/17/2014

Crutchfield Customer Review (What's this?)

Great product for my needs. I just needed a small amp to power the speakers I installed in my wrangler and this was perfect. I'm no car audio expert so the plug and play set up was ideal, and the result in the sound was well worth the money. It's small in size so you can easily conceal it, and the wiring is plenty long to put it in just about any location.

Pros: Plug and play, size, performance, and the price is reasonable.

Cons: It would be nice if it was a little more powerful

Love the Amp

Chrisafd from Averill Park, NY on 2/14/2014

Crutchfield Customer Review (What's this?)

Love how the amp help the sound of the system

Pros: Simple to install Great sound Wiring very simple

Cons: Wish that the price was lower

Alpine Power Pack

Randy from Chapel Hill, NC on 2/10/2014

Crutchfield Customer Review (What's this?)

Easy install. Great sound

Pros: Subtle music quality improvement. Easy hook-up. Very nice to not deal with extra batt.- power wire. Or ground!

Cons: Too much and too long wiring harness's for placing behind head unit. Almost did not fit cause of bulky wire overlapping.... Optional short wires would be appreciated !

Alpine KTP-445A Power Pack

Aloha808 from Hawaii on 2/4/2014

Crutchfield Customer Review (What's this?)

Very satisfied with product, got this pushing alpine type s components in the front and coaxials in the rear and they scream....

Pros:

Cons:

awesome little power pack!!

Jerry from Mount Vernon, Ohio on 2/3/2014

I have to say it packs a nice little punch for running your basic speakers in your system,

Pros: easy to install, supplies plenty of power for your highs

Cons: none

Install A Snap

Don R. from Columbia on 1/21/2014

Crutchfield Customer Review (What's this?)

Great little amp for adding some umph to you music. Install is a snap! " Snap here snap there Done! Now I have to upgrade my Alpine HU to take advantage of the low pass high pass crossover.

Pros: Increase in sound clarity. Easily to install.

Cons: None

GREAT SPEAKERS

JODY from MENDENHALL,MS on 1/19/2014

Crutchfield Customer Review (What's this?)

GREAT DEAL

Pros: EXCELLENT

Cons: NONE

Please read

ACE from Muscle Shoals, AL on 1/18/2014

I installed this with an alpine 149bt. The 1st unit from alpine was doa. The second had a high pitch whine that I'm certain is picking up noise from the fan in the alpine head unit. It sounds fine but cuts out well before clipping. The head unit power is cleaner all the way up to distortion. I tried running extra power and ground but nothing helped. I think this unit would work better with a lower powered head unit. I have been installing for years and love alpine, but this one didn't work out for me. Will install a normal 4 channel amp from alpine. Just dread the wiring. Ugh.

Pros: Very simple installation

Cons: Did not match well with the alpine 149bt

Little extra Oomph

A Mitchell from Long Island NY on 1/17/2014

Crutchfield Customer Review (What's this?)

Competent piece of equipment. Not going to shake the car apart. Will help at highway speeds and loud metro areas. Made idiot proof ( note oem radio fuse MUST be 15 amp) , install takes no time at all, just wire routing in dash.

Pros: Simple, Simple install. Small form factor. Long wires (con to some)

Cons: None

Easy Upgrade

RO from Rockford, IL on 1/10/2014

Crutchfield Customer Review (What's this?)

Easy to install and hide. Adds much better power to my Alpine head. It's not a 'monster' amp, but I was not expecting it to be either. I read many of the reviews here prior to purchase and had a pretty good idea what to expect. Of course now it has me thinking I should add a small sub in my truck.........

Pros: Economical, easy to install, nice power boost

Cons: none

Easy as pie.

MDS from San Luis Obispo, CA on 1/2/2014

Crutchfield Customer Review (What's this?)

Easy to install, easy to hide. This is a sweet way to bring a bit more boom to a basic installation for a minimal investment!

Pros: So easy a caveman can do it.

Cons: none?

Great amp

Anonymous from Navarre, Florida on 1/1/2014

Crutchfield Customer Review (What's this?)

Excellent amp combined with an alpine unit. Fits in a small space and wires into the radio with ease. Makes the alpine unit sound better than a new high end car radio.

Pros: Small, good sound quality.

Cons: Amplifies some white noise.

Alpine KTP-445A amp

Brandon B from Charlottesville, VA on 12/28/2013

This was purchased for me as a Christmas present at the Crutchfield store in Charlottesville. The new store is pretty cool with basically a touchscreen version of the website on every display table. It makes it really easy to compare product specs. The salesmen are attentive but not too pushy. My only knock of the store are that it doesn't come close to displaying all their available items, and you can't test most of the stuff (including speakers) out. Installation of the amp went pretty well. It's as easy as pulling out your head unit, unplugging it from the car, finding a good spot for the amp, then wiring the amp between the head unit and the car. It took me about 30 minutes total. 20 minutes of that was spent wedging the amp into a very tight spot behind the dash. Installers beware - the plugs on the wiring harnesses do not fit securely, that is, they don't "click" in, I had everything reassembled after testing only to find that my signal was going in and out due to a poorly connected harness. The sound is a huge improvement over my HD137BT's internal sound. I guess my speakers were actually capable of much more. The sound is richer, the bass fuller and less prone to distortion. The best part is how much better it sounds at low volume. I found myself turning up the volume before just to get more bass. Not necessary now. Overall, I'd say the power pack is a great value, especially if you don't want to get into a much more complex install involving a traditional amp.

Pros: Ease of installation Small Size Ample supplied wiring clean sound

Cons: Connectors do not click like you would expect

Easy

John F from Stratford CT on 12/20/2013

Crutchfield Customer Review (What's this?)

easy to hook up.

Pros: Plenty of power for me.

Cons: none

Alpine Power pack Amp

DanF from Charlotte, NC on 12/20/2013

Crutchfield Customer Review (What's this?)

Already had Alpine receiver in so connection was incredibly easy. Added power makes the Polk Audio 6.5" speakers perform well.

Pros: Easy install. Instant power increase over factory receiver.

Cons: Nothing wrong with product or directions. Feel like better tech support after purchase of Alpine receiver would have eliminated this purchase.

Alpine KTP-445A Power Pack

klus from tamaqua pa on 12/17/2013

Crutchfield Customer Review (What's this?)

great addition to unit

Pros: none

Cons: none

Fantastic Little Amp

NickS from San Clemente, CA on 11/15/2013

Fantastic little amplifier; Installed with the Alpine CDE-143BT in a 2010 Ford Focus SE running the stock speakers (no stock sub). I didn't test the setup without the amp, but at the moment I only need to turn the receiver up to about 10 volume wise to achieve great sound, at a volume loud enough to distinguish vocals from outside the car with the doors closed. I had to run the this through a PAC C2R-FRD1 before outputting to the speakers, but so far the adapter has had no compatibility issues and runs perfectly.

Pros: Small, Mountable virtually anywhere, 45Wx4 with no connections other than to the back of the radio!

Cons: There is at least a foot, possible more of spare wire on each side, but in some cases this may be a pro.

Alpine KTP-445A Power Pack

Anonymous from Torrance, CA on 11/11/2013

Crutchfield Customer Review (What's this?)

Great amp for being small. Very easy to install and hide

Pros: adds a lot of sound for a small amp. Small, easy to install

Cons:

Alpine KTP-445A Power Pack

J from Tyler, Texas on 11/4/2013

Crutchfield Customer Review (What's this?)

Works great with a nice clean sound. I hide the amp under the dash of a Jeep Wrangler JK.

Pros: I attached this to a Alpine head unit. I could not have been easier to install.

Cons: None

Alpine KTP-445A Power Pack

Mike F. from Temecula, California on 10/28/2013

Crutchfield Customer Review (What's this?)

Easy install... plug and play!

Pros: Plug and play with supplied wiring harness. Powerful wattage driving to your speakers.

Cons: None so far!

Alpine KTP-445A Power Pack

Eric M. from Lincoln Ne. on 10/27/2013

Crutchfield Customer Review (What's this?)

Stupid easy to install!!!!!!!!!

Pros: Provides plenty of power without pissing off the neighbors because your rattling their pictures on the wall.

Cons: Now I have to come up with the money to buy a set of 8 inch low profile subwoofers to put under the front seats of my 04 Dodge Dakota club cab

Great little amp!

Richard from New York, NY on 10/14/2013

Crutchfield Customer Review (What's this?)

Great little amp! I was in the market to upgrade my factory sound system in my car and didn't want to go crazy with amp wiring, etc, etc. Upon opening the box I was still shocked at how small this amp was. Due to this I was able to easily locate it on the inside drivers side part of my Civic's dash board with zip ties. I did not want to use the little mounting brackets because they just weren't the best option for me. Powering 4 Polk 6.5 coaxials this little amp works these speakers out! Sound is great!

Pros: Small package, great sound, easy installation.

Cons: None for me

A little more...oomph!

PurplePTGT from White Lake, MI on 10/8/2013

Crutchfield Customer Review (What's this?)

I installed a CDE-HD149BT head unit and initially I was going to send this amp back because I thought it wasn't needed. Then I decided to try it and well, it's a keeper. It doesn't add appreciably to the noise or distortion and it provides about 3dB more output than the head unit alone. This is just what I needed to get that little extra oomph. The installation couldn't be easier. It's literally plug and play...LOUDER! lol

Pros: Reasonable cost and a no-brainer installation.

Cons: No nits to pick here.

Good product

Anonymous from Mn on 9/29/2013

Crutchfield Customer Review (What's this?)

Good amp for its size works only draw back is high inputs makes it sensitive volume

Pros: Easy to hook up convenient amp

Cons: None

Works as expected

CRD from MS on 9/21/2013

Crutchfield Customer Review (What's this?)

Easy to install. I hid mine behind the carpet in the passenger floorboard up near the dash. I didn't try out the Alpine 143BT head unit before installing this so I am not sure of the amount of improvement. The sound is nice and full.

Pros: Plug and Play

Cons:

All alpine

EDDENTON from KANSAS on 9/20/2013

Crutchfield Customer Review (What's this?)

Compact amplifier is simple to install and works great. Uses the same power as the Alpine receiver. Not overly powerful (45 Watts/channel) but adds a lot of dimension to the sound. I get much more out of my MOMO speakers.

Pros: Super easy to install. Made to work with many Alpine receivers.

Cons: Low power. No "thumping" bass (but I don't really need that anyway, not trying to wake up the neighborhood).

great sounding amplifier

RandyT from Tupelo, MS on 9/10/2013

Crutchfield Customer Review (What's this?)

Super simple installation with plenty of wire length. Absolutely clear sounding with plenty of amplification.

Pros: Ease of installation. Clear sound. Great amplification.

Cons: None.

Alpine's KTP-445A

Mike from Sanger, CA on 9/5/2013

Crutchfield Customer Review (What's this?)

Makes my Alpine CDE-147BT sound that much better. I tested first by having my HU powering all my Alpine speakers in my Silverado, and then adding this plug-n-play pack. I hear the difference. Sounds louder at a lower volume level, and when I turn it up- the sound is clean and much clearer than just powering my speakers off of the HU. I know it's do to the fact that my aftermarket speakers need more RMS power, and this unit does it. But amplifying your speakers with an external amp(other brand) doesn't guarantee that they'll sound good. With this addition, it reassures me that I'm getting the best sound out of my speakers. An I can say that, because I can tell. An yes, I'm sure the sound coming out of the HU would of been fine, but adding this power pack makes my music experience that much better! Also , the cost to amplify the sound out of your speakers with this unit is less expensive than to have to buy: a amp(costs more), wiring kit, RCA cables, and maybe a new battery terminal to connect the power gauge wire to the amp from the battery. An at the end- the headache of installing and running power wires to a amp with a vehicle that might not be so installer friendly.

Pros: 45 watts RMS power by 4 channels, with very easy installation. Clean sound at any volume level. If you can install a reciever in your vehicle, you can install this!

Cons: Depending on where you going to install this unit, you might find that you have way more provided cable than needed. Zip tie and tuck rest of the wiring out of the way. Funny, because it's the only "con" I could think of.

Alpine KTP-445A Power Pack

Anonymous from wilson nc on 9/4/2013

Crutchfield Customer Review (What's this?)

great little amp easy install

Pros:

Cons:

big sound, little box!

JoeyW from Dallas, TX on 9/2/2013

Crutchfield Customer Review (What's this?)

I thought my alpine unit (CDE-145 BT) had good sound with my speakers (Kenwoods in the front Infinity Reference) in the back, but this little baby gave those same speakers some pop! Now I don't have to crank them up just to hear subtle notes bot when I want to crank it, I got clean, crisp, clear rockin' sound. This little baby will NOT disappoint.

Pros: easy to install, plugs right in the Alpine units; no extra wiring; long enough wiring to remote mount.

Cons: none I can think of

Great product!!

Anonymous from East Wenatchee on 9/2/2013

Crutchfield Customer Review (What's this?)

The size is great. Fits just about any where. Plug and play makes it super easy.

Pros: Size and plug and play

Cons: None

Alpine KTP-445A Power Pack

chuck m from nevada on 8/24/2013

Crutchfield Customer Review (What's this?)

I bought the alpine head unit cde-143bt to replace an old pioneer deck and wanted to try a little more power to push my 6 polk speakers that didn't have good sound quality with my sub. this small unit was everything I dreamed of without buying a big amp.. this little amp has brought my polks alive !!! the sound is perfect even pushing 6 spkers. the polks have punch to them now and beautiful sound quality. I am done !!! I have an suv with 2 dash spkers and 4 61/2 door spkers. I also have an amp and 12 inch ported sub. I'm 58 and a music lover and this is the best sounding unit I have ever had ! the great sound comes through with any kind of music! the power is there now. thank you for the great service and all the advice over the phone. your advisors need to listen a little better though. I had to splice my new deck in because he said I shouldn't need anything since I had a pioneer being replaced. no problem though. the install went great and I am very pleased. thanks again.

Pros: drives 6 polks with no problem. power and sound quality is great

Cons: way to much wires to stuff up in my dash, but I see why alpine has it.

This amp rocks.

Kevin from Kerrville, TX on 8/21/2013

Crutchfield Customer Review (What's this?)

I decided on this amp because I wanted something that would give me a good boost in sound, with minimal hassle. This amp does exactly what you'd think. It gives me clear, distinct sound from my front & rear aftermarket speakers. The separation between channels is great, the bass and highs are much more vibrant than before at both low and high volumes. If you're looking for a nice addition from a great company at minimal cost, I would definitely recommend this amplifier.

Pros: Cost, ease of installation, Alpine name, Sound quality.

Cons: None

Awesome

vlovell@verizon.net from Ashburn, Va on 8/21/2013

Crutchfield Customer Review (What's this?)

Easiest amp I have ever installed

Pros: Nice power as soon as you turn it on. Easy pass through install.

Cons: nothing!

Alpine KTP-445

Gb from Maryland on 8/20/2013

Crutchfield Customer Review (What's this?)

I own an Alpine head unit that needed a little more umph to push the 6.5 components in the front doors, along with the alpine 6.5's in the rear deck. The alpine sounded pretty good alone, but with the addition of the KTP-445, wow, what a way to wakeup the sound and definition of the music, with moderate volume.

Pros: The clarity and power in such a small package is amazing. I just plugged it in, and was done.

Cons: none

Alpine KTP-445A Power Pack

jason from alabama on 8/12/2013

Crutchfield Customer Review (What's this?)

its worth the money spent, they make your speakers sound awesome, and its very easy to install, I put it in my 05 ford focus and paired it with alpine 5x7 speakers makes them sounds great lots of bass

Pros:

Cons:

Great little amp

Rob from Reno, NV on 8/8/2013

Crutchfield Customer Review (What's this?)

very easy to hook up, specially with an alpine deck.

Pros: Easy hook up, compact and good clean power.

Cons: No gain control.

Alpine KTP-445A Power Pack

Anonymous from Dallas, TX on 7/22/2013

Crutchfield Customer Review (What's this?)

Nice addition for Alpine in-dash receivers. Really make my JL Audio speakers drive.

Pros:

Cons:

Alpine KTP-445A

Brad from Colorado on 7/17/2013

Crutchfield Customer Review (What's this?)

Recently installed the KTP-445A and it sounds great. Very easy to install and the sound has come to life. A very noticeable difference and well worth the money.

Pros: Small and fits in the dash easily. Sounds great, big improvement.

Cons: None

Great bang for your buck!

Anonymous from Manteca, CA on 7/16/2013

Crutchfield Customer Review (What's this?)

Very impressive sound from this amp installed with Alpine CDE-134BT head unit. The combo is powering Polk audio db651's in my front doors and Polk db461's in the rear pillar of my 99 GMC Sierra Reg Cab. Sound is very clear and loud. Install was easy with included parts from Crutchfield.

Pros: Great quality, easy install, inexpensive.

Cons:

awesome!!

Garry from Canton,Ohio on 7/4/2013

Crutchfield Customer Review (What's this?)

My wife wanted it LOUD! So I ordered this to go with her Alpine 137bt. All I can say is WOW is it LOUD. For the price and it's a class D amp that you can fit in the dash. Awesome Amp.

Pros: I'm powering 4 6X9's with the Alpine KTP-445A Power Pack and it's more power then needed for them.

Cons: none!

Power punch

Otto from Bradenton florida on 6/29/2013

Crutchfield Customer Review (What's this?)

Great little amp with plenty off power to rock your ride.i love how small this amp is it fit right behind my Alpine head unit.I also like how it plugs right into the head unit with no extra cables to run. The amp cranks out nice clear distortion free power it fill your ride with quality clear music. I would Definitely recommend this amp.

Pros: Gives your head unit a lot more distortion free power Size Ease of installation

Cons: Cables are a little to long

AmaIng difference in clarity

Eric S. from Arkansas on 6/28/2013

Crutchfield Customer Review (What's this?)

I will start this off by saying i have been a car audio enthusiast for 17 years. Have bought and used every brand, size, shape of stereos, speakers, subs out there. Havent been in the scene in a few years and decided to get back intoit but with a more grown up aproach this time, so. Opted for an 8" fosgate punch 2 subwoofer, memphis coaxials front and rear, the sub over powered the mids and highs even tho its an 8, wantd something to blend the rest of the system to the sub without goin crazy and buying another amp, this thing does that just perfect, not a huge impact as of i added processors and kultiple external amps, but a difference that anyone with an ear for sound can tell, the clarity this alpine amp provides to the memphis coaxials is amazing, the depth is there like it should be, clean, clear, crisp is what you should expect out of a set of aftermarket speakers and thats what alpine has done with this little beauty, and the ease of installation is well, just that, easy, unplug radio harness, plug into harness for amp, take the other harness on amp, plug into radio, simple as that. Zip tie or screw unti to something stable, and bam, you are done, thanks alpine for an awesome product, and thanks Crutchfield for the fast delivery!

Pros: Easy install, superb clarity

Cons: Nothing!

Excellent

P from Huntsville, AL on 6/25/2013

Crutchfield Customer Review (What's this?)

This is the easiest amp you will ever install. Probably not the best sound quality but its better than no amp.

Pros: Easy to install

Cons: None

Alpine believer

Zane from Huntsville, AL on 6/19/2013

Crutchfield Customer Review (What's this?)

My Alpine head unit just didn't have the power to drive /match my 10-inch bazooka sub. I really didn't want to downsize the sub and my technical expertise does NOT extend to a full up amp installation. So, imagine my joy when first reading about this Alpine add-on amp. It took me about 30 minutes to install (mainly because running the wires had to go through tight spaces behind the dash of an 06 Honda Civic Si hatchback). The unit fit neatly behind the dash. It is so small that I was able to install it with a piece of extra strength Velcro. The sound difference takes a bit of getting used to; by that I mean, there is not an overwhelming change BUT adjustments to the bass and treble are more noitcable and the volume can be set at "9-11" instead of "18-21". This allows the head unit to urilize the "Loudness" function providing a richer, full bodied sound.

Pros: Small size. Ease of installation. Plug and play installation for compatable head units. Price.

Cons: Can only be used with Alpine units (?)

Alpine KTP-445A

NeilH from Hartwell, GA. on 6/17/2013

Crutchfield Customer Review (What's this?)

Sounds great and could not be easier to install.

Pros: Easy install, very compact and better sound quality at lower levels.

Cons: None

great addition

Chris M from Granite Falls, Washington on 6/16/2013

Crutchfield Customer Review (What's this?)

Great addition to my CDE-102 head unit. It drives the MTX 6 1/2 Terminators separates quite nicely. Super clean sounding

Pros: great sound

Cons: to much wiring for under dash install.

Awesome upgrade here

Watson from Leominster,ma on 6/10/2013

Crutchfield Customer Review (What's this?)

Big difference in sound quality and deepness.

Pros: Everything

Cons: Nothing

Alpine KTP-445A

GlennH from Ocala, Fl. on 6/4/2013

Crutchfield Customer Review (What's this?)

I waited a while for this unit to become available and am glad I did. The speakers I bought are very efficient but an external amp helps them sound their best especially at lower listening levels. This amp with it's plug and play feature was very easy to install and gives me plenty of oomph and kept me within my budget. If you're considering an Alpine head unit, you won't regret adding this amp.

Pros: Easy plug and play install and small enough to place almost anywhere. Does what it says.

Cons: None.

Alpine power pack ktp-445a

Michael from Portsmouth NH on 6/1/2013

Crutchfield Customer Review (What's this?)

What a great item for someone that is looking just to have a better sounding stereo without over the top Amps.

Pros: Easy to install and hook up. Plug and play.

Cons: None

perfect for my needs

Patrick from concord, nh on 5/27/2013

Crutchfield Customer Review (What's this?)

I bought this amp to go with an Alpine head unit to install in my 61 Buick. It has all the power I need, and is extremely clean in delivery with a wide range of music. The compact size makes it easy to locate, and it looks & feels like a quality component.

Pros: Very clean sound offering plenty of power at a budget price.

Cons: The attachment points do not offer much flexibility for mounting.

Not necessarily louder, but "better"

Ezra from Broomfield, CO on 5/24/2013

Crutchfield Customer Review (What's this?)

Received the unit sooner than expected due to it being backordered - a nice surprise. Very nice build quality; all-metal construction, heavy enough to say "I represent quality", but not so heavy as to be unwieldy. Wire harness connectors leave a little to be desired - they came loose during testing. Make sure they're seated firmly as they don't "click" as obviously as you might expect. Otherwise, installation is ridiculously simple: Unplug the wire harness from the back of the head unit and stick the power pack in between that connection, using the cables that came with the power pack. Then figure out where you're going to hide the power pack and cable-tie the excess wire length. You're done, unless your deck isn't Alpine; then you'll need to splice a few wires. On volume: Prior to installing this power pack, turning up my Alpine CDE-HD149BT beyond 15 was a little straining on the ears; turning the head unit up beyond 18 was just plain uncomfortable. After the install, everything just sounded... better. Less ear fatigue when listening at higher volumes! On quality: Cleaner, crisper sound... it even sounded a little brighter than before, and that's with factory 6.5" door speakers and 1" tweeters. I didn't need extra volume, but I can hear a clear difference in quality and clarity that simply wasn't there before. And it's nice to know I can get the added volume when I want it, such as when leaving the doors open when working outside.

Pros: - Well-built and attractive - Small, fits almost anywhere (Mine went into a space inside the dash, under the head unit.) - Increases maximum volume - Improves sound clarity, which reduces ear fatigue at higher volumes - Literally "plug and play" - comes with everything needed, assuming you have an Alpine deck. If not, splice a few wires and you're done. - No need for complex door speaker amp installs; this is only 5 watts less per channel than a 4-channel amp, and FAR easier to install!

Cons: - Cable length was about 2-3 times longer than I needed for my install... but this is a good thing for some installs, and it comes with cable ties and mounting brackets in case you need them. Not a real "con" in my book.

KTP-445A - Early Impressions

Don L from Northeast Ohio on 5/21/2013

Crutchfield Customer Review (What's this?)

Got my new KTP-445A yesterday via UPS - as usual, very quick shipping by the good folks at Crutchfield. After working hours, I was able to install the unit in my 2007 Jetta Wolfsburg, connected to my CDE HD137BT in <15 minutes, including the time required to disassemble/reassemble the dash. The unit fit behind the radio without issue. I was pleasantly surprised when I shut the doors and "test fired" the new configuration - not massive volume boosts, but I was able to get considerably more volume before audible distortion after the installation. 18W to 45W per channel in 15m - amazing. Overall an amazing buy and a worthwhile investment for my humble audio system. I don't necessarily need (or want) it bone rattling loud - just clean with good frequency response across the board - this amp delivers that cleanly, accurately and with minimal installation efforts.

Pros: Fits most anywhere Long harness leads Solid locking connectors Easy installation Great clarity

Cons: No more adjustable levels (though I'd have probably run them at max output and let the HU make the changes...)

Details

Hands-on research

Product Research

Features

Overview: The Alpine KTP-445A Head Unit Power Pack is an easy-to-install power upgrade amplifier that allows you to add higher output and more dynamic response to your Alpine head unit. The KTP-445A amplifies your Alpine head unit's power output, resulting in a 150% power increase over the original power from the head unit's built-in amplifier.

Notes:
  • If the fuse protecting the OEM radio is less than 15 Amps, you should run a separate +12V constant power wire from the battery to the higher-powered Alpine KTP-445A.
  • The Alpine Power Pack amp will not work in systems where an outboard factory amplifier is still active. If used in vehicles with a factory amplifier, the factory amp will need to be completely bypassed (this may result in lost speaker channels, if factory amp has more than 4 channels).
  • The increase in power may result in a louder warning chime in certain vehicles.

Compatibility: The KTP-445A connects to any 2005 and newer Alpine head unit that has a black 16-pin wiring harness. Please check with your Crutchfield Product Advisor to confirm compatibility.

45 Watt x 4 Channel Amplifier: The Alpine KTP-445A Head Unit Power Pack employs a 45 watt x 4 channel amplifier. The amplifier offers an unbelievably low noise floor, taking extra care to ensure a clean signal path, with no extraneous interference. The end result is a 1 Watt Signal-to-Noise Ratio of 82dB or better. Uniquely, the amplifier distortion actually decreases at higher frequencies, resulting in a clean and clear signal where your ear is most sensitive to distortion.

  • CEA-2006 Power Rating: 45 watts x 4 channels (at 4/2-ohms, 20-20kHz, 1% THD)
  • Max Power Output: 90 watts x 4 channels (Peak)

Note: The specifications given by Alpine for the built-in amplifier comply with the CEA-2006 mobile amplifier power testing and measurement standards from the CEA (Consumer Electronics Association). All manufacturers who comply with the standard can display the CEA-2006 logo on their product.

Installation: Since the KTP-445A is small and compact, it installs behind your Alpine head unit in the dash of most vehicles. Installation is simple with no special tuning. The 39" grey connector harness plugs into one end of the Head Unit Power Pack and connects to the rear plug on your Alpine head unit. The 31" black connector harness plugs into the other end of the Head Unit Power Pack and connects to your Alpine receiver's harness (included with your Alpine receiver). You will need to splice or crimp the wires from the Alpine receiver's harness to a Crutchfield vehicle harness adapter (sold separately).

Note: The factory radio circuit needs to be a minimum of 15A. If it is not, a separate power and ground will need to be installed for the KTP-445A

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Custom fit and adaptation to my Alpine head unit. Makes life simple and easy. Beside alpine make excellent products.[ Paul  Sep 14, 2017 ]
Love it[ nelson  Sep 11, 2017 ]
Easy to install. Good reviews.[ Keith  Aug 30, 2017 ]
To get the extra power and punch out of my new system[ Kevin  Aug 22, 2017 ]
Recommended by Norm and its small amp[ Adam  Aug 20, 2017 ]
This item showed up as a suggestion in my shopping cart, based on the other items I intended to purchase. The description of the ease of installation got my interest, and the price and reviews clinched the deal.[ David  Jul 14, 2017 ]
Quick connect to my Alpine deck and the reviews are all positive, Im looking forward to clean powerful sound[ Charles  Jul 13, 2017 ]
Simplicity of installation and confidence in the brand.[ Frank  Jun 06, 2017 ]
Easy,compact and very good power.[ john  May 26, 2017 ]
Because Alpine makes amazing equipment, and this plug and play unit is a great example. by far the easiest way to amp all four speakers.[ Cory  May 20, 2017 ]
Increase quality of sound[ Kevin Matthew  May 07, 2017 ]
To boost the power of the Alpine deck I purchased.[ William  Apr 19, 2017 ]
I wanted it[ Jay  Apr 03, 2017 ]
To push more power to my speakers... the easy way.[ Alex  Mar 20, 2017 ]
Works well with my Alpine Stereo[ Alan  Mar 20, 2017 ]
More power![ ROBERT  Mar 18, 2017 ]
Past history with Alpine brand.[ layne  Mar 13, 2017 ]
Alpine amps are excellent[ John  Mar 02, 2017 ]
Extra boost to the speakers[ Shayne  Jan 29, 2017 ]
Alpine! No need to say anything else. Great power for tight places.[ kevin  Jan 19, 2017 ]
Needed a compact amp for my tiny, tiny car to give my new speakers a little extra power and clarity.The endorsement from their Miata audio article a couple of years ago sealed the deal for me.[ Callison  Jan 14, 2017 ]
plug and play connection easy install[ CHARLES S  Dec 31, 2016 ]
Needed for extra power[ Thomas  Dec 30, 2016 ]
easy power[ trev  Dec 21, 2016 ]
Matched up easily with my Alpine radio[ John  Dec 20, 2016 ]
Easy install[ henry  Nov 26, 2016 ]
Great addition to Alpine head units[ Leonard  Nov 25, 2016 ]
To go with my cde-hd149bt[ John  Nov 23, 2016 ]
Neat and clean setup, gives a nice boost to alpines head units.[ Alexander  Nov 16, 2016 ]
needed something easy to power my car speakers and the head unit was not enough. and it's Crutchfield![ dhaval  Nov 04, 2016 ]
Alpine has produced quality for as long as I can remember. When I saw how compact this amp is and after reading the specs, I thought it would be perfect for the application I intend to install with the KTP-445A. Not looking to compete but, knowing Alpine performance, this is going to be a great sounding system once all the components are assembled. Can't wait to see my wife's face when she hears her birthday present.[ James  Oct 15, 2016 ]
Simplicity of interface & installation with my Alpine HDE149BT HU.[ Terry  Oct 04, 2016 ]
I've been using Alpine units for about 15 years and this is compatible with my current unit (been meaning to pick this up for a while). Looking forward to the 'boost'.[ John  Sep 30, 2016 ]
It connects directly to my Alpine head unit.[ David  Sep 21, 2016 ]
Open convertable car so I need all the sound help I can get for a small compact space.[ Robert  Sep 16, 2016 ]
I needed a little more power from my receiver to push aftermarket speakers.[ Carlton  Sep 08, 2016 ]
Alpine is simply the best! This little amp is so easy to install and delivers impressive performance for the price and size[ Chris  Sep 06, 2016 ]
The name[ James  Sep 04, 2016 ]
excellent reviews. Norm also highly recommendedNorm's Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=117 [ Michael L.  Aug 12, 2016 ]
more power[ Hans  Aug 10, 2016 ]
Good reviews[ jesse  Aug 02, 2016 ]
To boost my new Alpine Headunit's power.[ TexasRedfish  Jul 31, 2016 ]
A former manager at local stereo shop spoke highly of Alpine and this little amp so when I decided to buy a new stereo for my new peterbilt I decided to give it a try ... I like the idea of how small and easy to install it is[ SEAN  Jul 12, 2016 ]
was told works with system didnt[ Roger  Jul 08, 2016 ]
I put one in my Saturn, boosted the sound of the JBL speakers. so why not do the same to the Ranger.[ James G.  Jul 06, 2016 ]
Good quality[ TIMOTHY  Jul 06, 2016 ]
ease of installation[ Michael  Jul 05, 2016 ]
Cheap upgrade for high quality and powerful sound.[ AARON J.  Jun 21, 2016 ]
Just enough added power to stop road noise when bombing down the highway as well boost clarity and volume even at low volume settings. Plus, i can install this vice paying someone to install and outboard amp.[ richard  Jun 04, 2016 ]
Power those speakers to full potential[ Zachary  May 30, 2016 ]
Compliments stereo for optimal sound.[ Scott  May 14, 2016 ]
Because I have an Alpine deck and like the way this just plugs into it.[ Dave  May 12, 2016 ]
Installed one of these beauties for a friend... man, night and day difference as far the Type R 6.5's are concerned.[ Henry  May 06, 2016 ]
I picked the KTP-445A Power Pack because it is a direct connect to my INE-S920HD receiver. Easy install no wires to spice.[ Bill  Apr 27, 2016 ]
Hopefully this will help with my aftermarket door speakers and alpine head unit. I have not recieved it yet but will post a better review when it arrives at my chateau.[ Travis  Mar 31, 2016 ]
Needed a little more power for the Alpine head unit to push the new speakers. Easy install and it's Alpine!![ CHRIS  Mar 26, 2016 ]
Looking to boost my Alpine stereos performance . This Amp is plug and play for my stereo and is compact .[ Charles  Mar 11, 2016 ]
It was an easy to install amplifier that gave the Alpine head unit a little more punch with the factory speakers.[ Evan  Feb 29, 2016 ]
Hope to boost power of new HU[ Keith  Feb 27, 2016 ]
plug and play power with an alpine 16- pin harness[ Anthony  Feb 24, 2016 ]
Advice of your advisor.[ Steve  Feb 22, 2016 ]
I wanted to boost the RMS power output of my new receiver without needing to add a large amplifier and the wiring work that would be required for it.[ Michael  Feb 21, 2016 ]
Extremely compact, powerful sound, and super easy to install.[ Mark  Feb 18, 2016 ]
Purchased and used one prior and I really loved how it woke up a mid-range radio with 4V out and good mids/highs. Stashes nicely once you trim down the VERY long leads which are included. Doesn't get hot at all even if stored in a tight spot, even in a car known to just breath engine compartment air over the unit and into the cabin ('95 Miata). Now installing in an '02 Jeep Liberty with JL VR components and ditching the brick under the seats.[ Wingnut  Feb 17, 2016 ]
Needed to power the speakers to their full potential.[ bruce  Feb 03, 2016 ]
I have two alpine receivers that this product will work with.[ Cordie  Jan 23, 2016 ]
I usually don't amp my door speakers because I never turn my deck volume up past half way. 18w RMS is loud enough and I don't need to be heard 3 blocks away. However I agree that 18w RMS isn't enough to get the full potential out of a speaker. I chose this amp because it is a easy install inline with an Alpine deck not requiring power and ground cables and running or splicing speaker wire to the door speakers.[ Mark  Jan 18, 2016 ]
My entire system is alpine i want more power for my system for the summer[ Robert  Jan 10, 2016 ]
Small. Cute. Puts out power.[ Blaine  Dec 27, 2015 ]
Want big sound, alpine delivers.[ paul  Dec 21, 2015 ]
To add extra amps,over amps produced by new head unit. Also because it's an Alpine,the plug n play to another Alpine head unit was flawless![ Richard  Dec 17, 2015 ]
I wanted to add a little boost to my Infinity Reference speakers without spending too much. Just to give me an idea of the potential of my speakers, while i try to decide if I want to upgrade or not. It was at a reasonable price and I have a compatible Alpine head unit. Plus I was curious to see how it performed versus an average sized amp.[ Gilberto  Dec 16, 2015 ]
Great audio and easy install.[ Don  Dec 12, 2015 ]

42 questions already asked

I believe so.[ ANDREW  Jun 05, 2017 ]
Should be, it connects in line from the head unit toward your speakers , using the same connectors. I recommend it if you want good sounding loud music without installing an amp.[ william  Jun 05, 2017 ]
I installed this in my 97 Buick, I used all the factory wiring, upgrading to Rockford Fosgate speakers. I just used all the wires that came with the amp, I had no problems with distortion, even when my kid played his music loud.The harness is a bit long and required a little creative stuffing to get it to fit. Good luck[ Patrick  May 25, 2017 ]
No you don't need that heavy a gauge. It's overkill. The amp isn't that demanding. I used existing gauge, 16 I think. No problems whatsoever. It is not real loud but it certainly cleans up the music. I really like mine.[ BRIAN E  May 25, 2017 ]
If you are using it with an alpine head unit it will have direct connect plugs. No extra wire is needed[ James  May 25, 2017 ]
As I recall, there is no power connection required. Simply unplug the harness from the head unit, plug that harness into the amp, the plug the amp harness into the head unit. Done. Simple as that, and really worth the low price.[ JW  May 24, 2017 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer, or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Kenny  May 22, 2017 ]  Staff
Unless you can change the settings in the head unit, there is nothing on the amp that allows any changes at all. It is just in line with the speaker and power connector.[ BENSON H  Apr 30, 2017 ]
We put one in an 89 GMC Sierra Regular Cab. We replaced the factory head unit with an Alpine. There was plenty of room to secure this amp behind or under the head unit[ Joseph  Dec 20, 2016 ]
Behind the radio on top of the duct work secure it with what u can i used two sided tape and made a brkt on a dash brkt[ DONALD L  Dec 20, 2016 ]
I mounted mine behind an Alpine ILX-007 in the dash of a 2003 Silverado.[ Clint  Dec 20, 2016 ]
It would fit behind the dash... that's the beauty of it.[ MATTHEW  Dec 20, 2016 ]
I have an 02 silverado and was able to mount it under the console close to the cup holders[ Jonathan  Dec 20, 2016 ]
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.[ Kenny  Dec 17, 2016 ]  Staff
Yes[ scott  Nov 26, 2016 ]
Not sure exactly what your asking here but that until will work with that radio. If your asking if it will fit in the car, it fits behind the stereo in my 03 f250. It is actually pretty small[ Richard  Nov 26, 2016 ]
First off, unless you have plenty of sound deadening material installed, this may not be enough wattage to hear over the exhaust or the supercharger. Having said that, I cant see why it wouldnt.[ shawn  Nov 25, 2016 ]
Should work with all Alpine head units. It is a must have if you upgrade your unit. The wattage that comes with new head units is not enough by itself.[ ryun  Sep 19, 2016 ]
Yes it will.[ MICHAEL  Sep 19, 2016 ]
Every car's dash space is different and I'm not familiar with the Fiero other than knowing that it's a midengine design. Does this mean that you have a trunk in the front and no firewall? Extend the wire harness if you need to and put the amp up there. I managed to sneak one of these amps behind the dash in my Miata. I had to use wire ties to secure it but it's in and doesn't rattle. The amp has generous wiring harness length and you should be able to find a place. The effort required to install it will be rewarded by the additional sounds you'll get from this amp. So, have you tried calling Crutchfield Support? [ Pat  Aug 01, 2016 ]
I put both of them, ( ya, I bought 2 for 2 different vehicles) under the dash. I used zip ties and little hope. I used it in my daughters 2000 VW bug and my 98 Chevy pickup.[ GENE  Aug 01, 2016 ]
I would not think so. With the plug and play, it is just that. It will amplify you door speakers. I would go the route of a bigger 4 channel amp if you feel the need of more power. I can tell you this little amp does a great job on my 4 door speakers.[ COREY  Apr 09, 2016 ]
You can't hook 2 of them together.[ terry  Apr 09, 2016 ]
I did a quick check in Crutchfield and it appears the 6 speaker system is (2 front door speakers + 2 tweaters) and two rear deck speakers. Typically, the tweaters are fed off of a filter from that is between the door speaker and the tweater. As such, you still have a four channel system which is what the Alpine Power Pack is designed for. So, I think the Alpine amp will work with your system. My application for this amp was in an old Jeep to power the dash speakers and overhead speakers. I used a separate amp to power subwoofers. I'll have to qualify my answer in two ways. One, simply speaking, this amp will work, is relatively easy to install and can drive your stock speakers better than the stock unit can. Two, while this amp worked ok, I don't think it has enough power to drive really deep sound at moderate to high volume levels. I would recommend deriving low level signal outputs, and put a high quality 5 channel amp and replace the speakers. If you want to take it in steps, you could install the Alpine power pact and then add a separate amp/subwoofer later. Hope this helps.[ Roger Daren  Mar 08, 2016 ]
If you are adding this to an existing sound system you might have problems. I installed this unit at the same time as a new Alpine radio. The wiring harness to the radio plugged right into the output of the amp, then the supplied cord plugged into the input end and into the radio. Unit was excellent, it was put into a Jeep Wrangler with the top off and had more than enough power to overcome road noise. You might have to do some creative wiring to a ford radio.[ JAMES  Mar 07, 2016 ]
First off, there is two versions of the power pack. One is the KTP-445A for use with compatible Alpine head units. The other is KTP-445U which is universal. In your case, you want to use the universal power pack. *Will it help? Well, it's an amplifier, so it's gonna boost the power going to you're upgraded speakers and improve your overall sound and volume. (if they're installed properly)*Do you need it? Yes, if you want to experience the actual benefits of an aftermarket speaker, but they'll still work without it. *Will it work with the factory radio? It will if you hook it up correctly. I should mention that some (if not all) factory radios have a pre-programmed EQ, so the factory speakers can sound their best. In other words, they give out a modified signal, unlike an aftermarket radio which gives out a pure, untouched signal. There's products to address that, like the JL Audio Clean Sweep for example. But you should still be able to connect an Alpine Power Pack directly to the factory radio without one.[ Gilberto  Mar 27, 2016 ]
It sure will.I was limited on space and this was a perfect fit and it powered up front and rear speakers which paired well with the 2 10 inch subs.The techs at Crutchfield are amazing.Enjoy the sound.--Marty[ MARTY R  Mar 04, 2016 ]
It's plug and play with the Alpine head unit I purchased. I do not know if it is compatible with your stock radio. The Polk speakers will add quality to your sound, it won't add power to your system. My guess is that the oem radio is sufficient to most needs. The alpine amp is just a booster, not a full blown unit. Most later model automobile sound systems already have an amp bigger than the Alpine unit.[ GARY  Mar 03, 2016 ]
This amp is specifically for Alpine receivers. It will not work with any other headunit. For a universal amp, try the KTP 445U amp.http://www.crutchfield.com/p_500KTP445U/Alpine-KTP-445U-Power-Pack.html [ TYLER  Mar 03, 2016 ]
If you bought the universal version of this it will work with a stock radio. You will need to dplice into the factory wiring. You can tell a big difference with this littke amp[ COREY  Mar 03, 2016 ]
Yes it will work. It is worth the money big time![ BRIAN  Mar 03, 2016 ]
My understanding is there are two versions of the power pack. I bought the version that mated with my alpine head unit. You want the general version. It added just enough to my setup to be a satisfying blend with my subwoofer.[ Ronnie  Feb 27, 2016 ]
No. First of all; the Alpine KTP-445A model is for use with compatible aftermarket car stereos only. Unless you have a compatible Alpine, you'll need to use the KTP-445U model instead: http://www.crutchfield.com/p_500KTP445U/item.html This power pack offers "Speaker Level Inputs" so an external Line Output Converter is not required to get the audio signal into the amp. If you decide to add a subwoofer and the amp you select does not offer the speaker level inputs, you can use the Audio Control LC2i converter to supply signal (RCA) and remote turn-on for the amp: http://www.crutchfield.com/p_161LC2I/item.html I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5 [ Ryan  Feb 01, 2016 ]  Staff
I am not sure. i bought mine to power a new Alpine receiver because it was definitely plug n play. I would check and see if they have a pioneer to alpine harness converter. At at the same time, i put the Alpine power pack in with the receiver, Crutchfield sent me a factory to alpine harness converter that made the receiver plug n play. Best i can offer.[ VINCENT E  Jan 08, 2016 ]
I don't think so alpine does not have the same connector Enter an answer to this question.[ MARK  Jan 08, 2016 ]
No it's a plug and play for alpine[ DAVID  Jan 08, 2016 ]
Just plug in and play[ ALEX  Dec 26, 2015 ]
I would contact a Crutchfield advisor. While I think it is designed take take in a high-level input and should work with any speaker output on a radio, Alpine says it is designed to work with certain Alpine head units from 2005 and later. Honestly, I think you'd be better off with an Alpine 4-channel amp that you can install under the seat. Most of them can take a high-level input and will have better performance than the Power Pack. With either type of amp, you still need to run a power wire from the battery, so I don't think you're saving anything by choosing the Alpine Power Pack.[ RICHARD  Dec 19, 2015 ]
Yes. Your receiver has 6 sets of pre-amp outputs and will work great with this amp.[ Jeff  Dec 04, 2015 ]  Staff
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Krissy  Oct 05, 2015 ]  Staff
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Sep 22, 2015 ]  Staff
Thanks for your question. For information on comparing two or more models I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences and help you make the best choice for your system and your budget.[ Krissy  Sep 20, 2015 ]  Staff
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Jul 12, 2015 ]  Staff
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/. [ Krissy  Jul 10, 2015 ]  Staff
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Jul 07, 2015 ]  Staff
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Apr 05, 2015 ]  Staff
Amp does not get hot...and I have it stuffed in the dash of a jeep tj. Great product. Would recommend. As far as speakers, I always go with a company that only makes speakers. Such as Infiniti or Polk audio. That's my preference.[ LANCE E  Apr 07, 2015 ]
I installed mine in a 2008 F-150 and basically just laid it in the open space in the dash behind the CD receiver. I live in Florida and have experienced no issues with it in almost 2 years. Sorry, I can't speak about your impedance issue but it seems close enough to not matter.[ GLENN  Apr 02, 2015 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Mar 19, 2015 ]  Staff
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Feb 27, 2015 ]  Staff
I forwarded your question to an Advisor and they responded with the following: Yes, the KTP-445A amplifier is compatible with the Alpine ILX-007 head unit.If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.[ Krissy  Dec 05, 2014 ]  Staff
I forwarded your question to an Advisor and they responded with the following: No, you will not be able to use that particular model. You will need the Alpine KTP-445U (500KTP445U) to use with your Kenwood receiver.If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.[ Krissy  Nov 14, 2014 ]  Staff
I have been told it can be used with any unit but it requires knowledge of which wires go to which point. Alpine used to make a universal amp just like this one that had open wiring[ JOEY  Nov 12, 2014 ]
You can make it work by way of a universal adaptor that crutch field sells[ JOE  Nov 12, 2014 ]
You would need the wiring diagrams for both. But it should be possible, maybe with an adapter. The size of it makes it really convenient to hide.[ BENJAMIN  Nov 12, 2014 ]
When I boug mine there were two different power packs. One works only with alpine units, the other works with any unit.[ PHILIP M  Nov 12, 2014 ]
Since I installed this over a year ago, I can't be for sure but I do not recall any form of channel adjustment on my model.[ RANDY  Sep 21, 2014 ]
There aren't any gain settings on the unit itself Travis. It's just a straight 45 watts per channel to your speakers. The best sound will be if you have speakers that are matched to that. Or closely matched. I bought an entire package from crutchfield which included four infinity speakers that are around that wattage. I prefer to always buy speakers from a company that just manufactures speakers. Infinity, Polk audio, Altec Lansing, etc. Hope this message helped. Lance[ LANCE E  Sep 21, 2014 ]
There are no adjustments settings on this amp. I will say that the default settings on this would be equivalent to a "high" setting on an amp that is adjustable. On my INE-S920HD head unit, before turning the head unit's gain to the lowest setting, the volume would max out at volume level 10 (the volume goes to 40 or 50). With the gain all the way down it screams at level 20.I am running this amp with eight speakers. 2 5" polk audio db501's per channel (8 speakers total at 2ohms per channel). This little amp is bomb proof, rock solid, and sounds amazing.[ TONY M  Sep 21, 2014 ]
yes you do. the unit plugs into the alpine wire harness from the head unit. I would recommend buying a head unit wih this power pack it all works exellent together. No running power wires, speaker wires ect. if you purchase a traditional style amp. Hope this helps[ CHRIS T  Sep 15, 2014 ]
No you do not you can either hard wire it to your receiver or buy an adapter plug the amp comes with directions on the wiring process that is very easy to understand[ JOE  Sep 15, 2014 ]
No I run it off a JVC receiver.[ DUSTIN J  Sep 14, 2014 ]
Nope, it has RCA type inputs for the preouts of any receiver. connects just like any other amplifier...[ PAUL  Sep 14, 2014 ]
Yes u need an alpine receiver to use this[ DEREK  Sep 14, 2014 ]
It only works with alpine[ DAVID  Sep 14, 2014 ]
Good Morning, My installation did not require any seperate wire to the fuse panel or battery. I connected the amp to the factory wiring and the stereo (apline) to the amp. pretty simple install.[ ALEJANDRO  May 03, 2014 ]
No, just plug it in and your fine[ JASON  May 02, 2014 ]
No I did not run a separate wire, the radio power is fused. I have not had any issues.[ KEVIN  May 02, 2014 ]
I'm confused in which fuse does the product overview refer to? Is it the 20A on instrument panel? or 10A on the Head unit fuse holder? [ ferdinan  May 02, 2014 ]
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Apr 25, 2014 ]  Staff
You will have to bypass the factory amplifier to use this product. See the product research section on this product's page at Crutchfield's website.[ RICHARD  Dec 19, 2015 ]
I would imagine the techs at Crutchfield could answer this better than I, but I believe you cannot connect amplifiers in tandem without some seriously advanced circuitry. The Alpine power pack should take care of your needs anyways, so go ahead and disconnect your factory amp.[ BRAD W  Mar 03, 2014 ]
I baught one and i unplugged the wiring harness from the back of the stereo into the powerpack and then the powerpack to the stereo. It cannot be any easier.[ VICTOR  Feb 28, 2014 ]
Hi David,I did not get to use this product. I bought it with the guidance of Crutchfield tech support and I feel I did not get the correct advise. when I bought the unit I gave the make and model of my car with some other details. Since I had done all the rewiring for the Alpine head unit before I was told that I could just plug it in line with my set up. What they overlooked was that I already had a factory installed amp. When I installed the power pack it blew out a couple of circuit breakers because both amps were on line. I disconnected the power pack and returned it and continue to use the factory amp with the Alpine head unit and it works great. Sorry I could not be more help.[ FELIPE  Feb 28, 2014 ]
U cannot run a 2nd amp in your truck. ...short of some really fancy wiring that a electronics engineer would have to do some head scratch'n. My 99 dodge with the infinity system was a bleedn nightmare trying to hook it up. Finally, I pulled the amps(located on the speakers) replaced everything w after market wires, speakers, head unit, and amp. The good news is, you will absolutely love the sound. Best of all my trucks is the alpine amp setup. Good luck JJ[ JACK  Feb 28, 2014 ]
I have an 07 gmc sierra classic. I'm going to purchase an alpine head unit to replace the factory radio. Will this power pack be compatible with my truck? [ robby  Apr 20, 2014 ]
For details on compatibility or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.[ Krissy  Jan 31, 2014 ]  Staff
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