Alpine KTP-445A Power Pack

Upgrade your Alpine receiver to 45 watts RMS x 4

Item #: 500KTP445A

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96 Reviews | 11 questions - 28 answers

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The KTP-445A connects to any 2005 and newer Alpine headunit that uses a black power harness. It will not work with the CDE-100 receiver.

If your receiver's power circuit is not protected by a 15-amp or larger fuse, you'll have to run a separate power wire to the battery. Be sure to add a 15-amp inline fuse as close to the battery as possible.

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. Best of all, you install the compact Power Pack by plugging it directly into your Alpine receiver's wire harness — no extra wires to run, and no other connections needed.

Alpine KTP-445A Power Pack and harnesses

KTP-445A Power Pack and harnesses

Note: The KTP-445A Power Pack won't work in systems where an outboard factory amplifier is still active. You'll have to bypass the factory amp if you want to upgrade your power with the KTP-445A. Please contact an Advisor at 1-888-955-6000 to check compatibility if you have any questions.

Product Highlights:

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Hands-on research

What's in the box?

Download owner's manual

  • 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 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.

Note: When used in vehicles with a factory amplifier, the factory amp will need to be 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 open the box, verify contents, 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.

Alpine KTP-445A Power Pack Reviews

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Impact

Written By RichOne, Louisville,Kentucky on Monday, December 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

Written By greg, charlotte nc on Sunday, December 07, 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

Written By Larry, Kauai Hawaii on Saturday, November 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

Definitely the "secret sauce" in my vehicles

Written By doa70, NJ on Thursday, October 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

Written By Aaron, Albany, NY on Wednesday, October 08, 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

Written By Ben, Manchester, CT on Monday, October 06, 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

Written By Lee, Bonners Ferry, ID on Wednesday, September 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

Written By bkelly, ATL on Monday, September 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

Written By momule, Rural Eastern Missouri on Thursday, August 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

Written By kevin m, oakdale, ca on Tuesday, August 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

Written By Kevin, South Carolina on Tuesday, August 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

Written By CaptainWinter, Seattle, Wa on Friday, August 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

Written By Eric, Fresno, CA on Friday, August 08, 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!

Written By kelbyv, Lubbock, TX on Thursday, August 07, 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

Written By Kevin, Fort lauderdale, Florida on Monday, August 04, 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

Written By mtrops, Wrightwood, CA on Monday, July 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.

Written By Anonymous, Oklahoma City, OK on Saturday, July 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..

Written By DJ Puppy, Kalamazoo Mi on Friday, July 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

Written By Michael, Harrisonburg, VA on Tuesday, July 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!

Written By Paul V, Sierra Vista,AZ on Saturday, July 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

Written By Seth, Richmond, VA on Wednesday, July 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

Written By jack, trevose,pa on Monday, June 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

Written By Clark, Searcy, AR on Sunday, June 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

Written By Gutierrez, Longview, Texas on Sunday, June 08, 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

Written By WWB III, 70774 on Thursday, June 05, 2014

Crutchfield Customer Review (What's this?)

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

Alpine Ktp-445A

Written By Michael, Hartford City, IN on Wednesday, May 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

Written By Wildcat1, Paducah, KY on Saturday, May 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!

Written By Mike S., Fayetteville, NC on Friday, May 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 !

Written By Brian H, Bluffton SC on Thursday, May 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

Written By Greg, Charlotte, NC on Tuesday, May 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

Written By Gil928, Kemah, TX on Tuesday, May 06, 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!

Written By g_boy91, Brownsville, TX on Monday, May 05, 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?

Written By EMTJJP, Dalton, MA on Monday, April 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

Written By Blaze, Morgantown, PA on Tuesday, April 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

Written By lcseds, Durham, NC on Friday, April 04, 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

Written By Anonymous, United States on Friday, April 04, 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

Written By David G, Odebolt IA on Monday, March 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!!!

Written By WarrenW, New Jersey on Friday, March 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

Written By Falcon3, Atwater, CA on Wednesday, March 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

Written By F, Dallas on Wednesday, March 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

Written By Anonymous, Battle Mtn, Nv on Tuesday, March 04, 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

Written By Michael, Canyon Tx on Friday, February 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

Written By mark ny, Poughkeepsie, NY on Monday, February 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

Written By Josh, San Diego on Monday, February 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

Written By Chrisafd, Averill Park, NY on Friday, February 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

Written By Randy, Chapel Hill, NC on Monday, February 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

Written By Aloha808, Hawaii on Tuesday, February 04, 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!!

Written By Jerry, Mount Vernon, Ohio on Monday, February 03, 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

Written By Don R., Columbia on Tuesday, January 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

Written By JODY, MENDENHALL,MS on Sunday, January 19, 2014

Crutchfield Customer Review (What's this?)

GREAT DEAL

Pros: EXCELLENT

Cons: NONE

Please read

Written By ACE, Muscle Shoals, AL on Saturday, January 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

Written By A Mitchell, Long Island NY on Friday, January 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

Written By RO, Rockford, IL on Friday, January 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.

Written By MDS, San Luis Obispo, CA on Thursday, January 02, 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

Written By Anonymous, Navarre, Florida on Wednesday, January 01, 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

Written By Brandon B, Charlottesville, VA on Saturday, December 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

Written By John F, Stratford CT on Friday, December 20, 2013

Crutchfield Customer Review (What's this?)

easy to hook up.

Pros: Plenty of power for me.

Cons: none

Alpine Power pack Amp

Written By DanF, Charlotte, NC on Friday, December 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

Written By klus, tamaqua pa on Tuesday, December 17, 2013

Crutchfield Customer Review (What's this?)

great addition to unit

Pros: none

Cons: none

Fantastic Little Amp

Written By NickS, San Clemente, CA on Friday, November 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

Written By Anonymous, Torrance, CA on Monday, November 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

Written By J, Tyler, Texas on Monday, November 04, 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

Written By Mike F., Temecula, California on Monday, October 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

Written By Eric M., Lincoln Ne. on Sunday, October 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!

Written By Richard, New York, NY on Monday, October 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!

Written By PurplePTGT, White Lake, MI on Tuesday, October 08, 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

Written By Anonymous, Mn on Sunday, September 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

Written By CRD, MS on Saturday, September 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

Written By EDDENTON, KANSAS on Friday, September 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

Written By RandyT, Tupelo, MS on Tuesday, September 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

Written By Mike, Sanger, CA on Thursday, September 05, 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

Written By Anonymous, wilson nc on Wednesday, September 04, 2013

Crutchfield Customer Review (What's this?)

great little amp easy install

big sound, little box!

Written By JoeyW, Dallas, TX on Monday, September 02, 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!!

Written By Anonymous, East Wenatchee on Monday, September 02, 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

Written By chuck m, nevada on Saturday, August 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.

Written By Kevin, Kerrville, TX on Wednesday, August 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

Written By vlovell@verizon.net, Ashburn, Va on Wednesday, August 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

Written By Gb, Maryland on Tuesday, August 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

Written By jason, alabama on Monday, August 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

Written By Rob, Reno, NV on Thursday, August 08, 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

Written By Anonymous, Dallas, TX on Monday, July 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

Written By Brad, Colorado on Wednesday, July 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!

Written By Anonymous, Manteca, CA on Tuesday, July 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.

awesome!!

Written By Garry, Canton,Ohio on Thursday, July 04, 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

Written By Otto, Bradenton florida on Saturday, June 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

Written By Eric S., Arkansas on Friday, June 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

Written By P, Huntsville, AL on Tuesday, June 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

Written By Zane, Huntsville, AL on Wednesday, June 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

Written By NeilH, Hartwell, GA. on Monday, June 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

Written By Chris M, Granite Falls, Washington on Sunday, June 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

Written By Watson, Leominster,ma on Monday, June 10, 2013

Crutchfield Customer Review (What's this?)

Big difference in sound quality and deepness.

Pros: Everything

Cons: Nothing

Alpine KTP-445A

Written By GlennH, Ocala, Fl. on Tuesday, June 04, 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

Written By Michael, Portsmouth NH on Saturday, June 01, 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

Written By Patrick, concord, nh on Monday, May 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"

Written By Ezra, Broomfield, CO on Friday, May 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