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Alpine KTP-445A Power Pack

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

159 Reviews | 33 questions - 64 answers

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Item #: 500KTP445A

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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 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.

Can't go wrong with alpine!

Aaron, Salem, OR

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

Product Highlights:


Alpine KTP-445A Power Pack

Average Customer Review(s):

(159 Reviews)

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!



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.



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


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



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


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.



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.



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.



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


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.



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!!


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


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.



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.


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




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 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


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


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.


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



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.


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.


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.


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



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....



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


JODY from MENDENHALL,MS on 1/19/2014

Crutchfield Customer Review (What's this?)



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


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


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


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



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 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



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.



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.



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!


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...)


Hands-on research

Product Research


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.

  • Because of its high-powered amplifier design, the Alpine KTP-445A does require that a separate +12V constant power wire is run to the battery with a separate inline 15A fuse in vehicles with lower than a 15A fuse protecting the factory radio. Check out the "Accessories" tab for wiring kit.
  • This Alpine high-powered amp won't 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