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Alpine KTP-445U Power Pack

Upgrade any car radio to 45 watts RMS X 4

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Our take on the Alpine KTP-445U Power Pack

by Zak Billmeier
Alpine

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.

Alpine Authorized Online Dealer

More power, less hassle

Want a simple way to crank up the power of your receiver? Alpine's "Power Pack" amplifier increases your receiver's power output to 45 watts RMS by 4 channels. That's a big jump up from the 7-20 watts per channel typically put out by a car radio, and plenty of power to drive high-performance speakers or keep up with a big subwoofer amplifier. Best of all, this compact amplifier is so efficient you can often run it off the same circuit that powers your receiver. A universal plug lets you feed a signal via RCA outputs or speaker-level wiring.

The KTP-445U will work with just about any car stereo, but it's not a plug-and-play installation — you'll have to wire it into your system. If your car receiver's power circuit is protected by a 15-amp or larger fuse (check your fuse box or owner's manual), you can tap into it to power your KTP-445U. Otherwise, you'll have to run a power wire to the battery. Be sure to add a 15-amp inline fuse as close to the battery as possible.

You can install this compact amp behind most dashboards, but you'll need 4-channel patch cables to connect your car stereo to the amp's preamp inputs. You can also splice into your speaker wiring to get signal to the KTP-445U.

Important Note: The KTP-445U Power Pack won't work in a system with an active factory amplifier. You'll have to bypass the factory amp if you want to upgrade your power with the KTP-445U, and we don't recommend using this Alpine amp to replace a factory amp with more than 4 channels. Please contact an Advisor at 1-888-955-6000 to check compatibility if you have any questions.

See more info on this item

Highlights:

  • compact Class D amplifier for factory and aftermarket receivers
  • universal plug lets you send signal from RCA outputs or speaker-level wiring
  • runs off same power circuit as receiver (must be 15-amp or more)
  • 4-channel amplifier
  • 45 watts RMS x 4 at 4 ohms (CEA-2006 compliant)
  • built-in high-pass crossover (selectable 60, 80, 120 Hz at 12 dB/octave)
  • selectable gain switch (high/low) and switchable 2- or 4-channel operation
  • fuse: 15A
  • dimensions: 7-7/8"W x 1-1/2"H x 2-9/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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45 x 4
Peak Power Output (Watts x Channels)
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90 x 4
Power at 2 Ohms (Watts x Channels)
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45 x 4
Bridged Power (Watts x Channels)
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90 x 2
Minimum Impedance Bridged
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4
Minimum Impedance Unbridged
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2
Best Frequency Response
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20-20k Hz
THD at Rated RMS Power
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1%
Signal to Noise Ratio
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82 dB
Input Voltage
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14.4v
Features
Amplifier Class
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D
Low-Pass Crossover Frequency
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N/A
Low-Pass Slope (dB/octave)
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N/A
High-Pass Crossover Frequency
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60, 80, 120Hz
High-Pass Slope (dB/octave)
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12 dB/oct
Bass Boost
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No
Bass Boost Frequency
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N/A
Fan Cooled
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No
Fuse Rating
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15
Speaker Level Inputs
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Harness
Preamp Outputs
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No
Width (inches)
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7-7/8
Height (inches)
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1-1/2
Depth (inches)
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2-9/16
Parts Warranty
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1 Year
Labor Warranty
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1 Year
Product Research
What's in the box?

Download owner's manual

  • Head Unit Power Pack (15A fuse installed)
  • 30" Power/speaker-output harness
  • 5.5" Speaker-level/low-level input harness (Turn-on lead is 40" long)
  • 2 Metal brackets
  • 4 Phillips/Hex-head mounting screws
  • 4 Wire-ties
  • Owner's Manual (En/Fr/Sp)
  • Limited Warranty card
  • "Thank You" letter

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.

Features

Overview: The Alpine KTP-445U Head Unit Power Pack is a power upgrade amplifier that allows you to add higher output and more dynamic response to your aftermarket or factory installed car stereo system (without factory amplifiers). The KTP-445U amplifies your aftermarket or factory head unit's power output, resulting in increased power over the original head unit's built-in amplifier. It's small and compact at only 7.875" (w) x 1.5" (h) x 2.5625" (d) and fits behind the head unit in the dash of most vehicles. The KTP-445U comes equipped with RCA and auto-sensing speaker level inputs.

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.

45 Watt x 4 Channel Amplifier: The Alpine KTP-445U 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 (< 0.03% THD+N @ 1W; 1% THD+N @ rated power).

CEA-2006 Compliant: 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.

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

Controls: The Alpine KTP-445U Head Unit Power Pack provides independent controls for the Front & Rear inputs.

  • Front & Rear Gains: The Power Pack provides simple variable gain controls (speaker level: 0.5-10V, low-level: 0.2-4V) for flexibility and a wide variety of system applications.
  • Front & Rear HPF: High-Pass selectable switches for the amplifier's Front & Rear inputs allow frequency filtering for a wide variety of speakers. Choose "Full-Range" or a selectable range (60Hz, 80Hz, 120Hz) to fine-tune your crossover points (-12dB/oct.).
  • Configurable Inputs: On the bottom panel of the Power Pack there are selectable input options to accommodate Speaker-Level (0.5V-10V) or RCA (0.2V-4V) inputs.
  • 4Ch/2Ch Modes: Selectable 2-Channel & 4-Channel options give you the control to determine source inputs, and can eliminate the need for Y-adapters.

Low-Level & Speaker Level Inputs: The Alpine KTP-445U Head Unit Power Pack includes a 5.5" low-level/speaker-level input harness. The harness features a proprietary 10-pin connector on one end that plugs into the KTP-445U and two pair of stereo RCA inputs that connect to your source unit's front & rear RCA outputs using a pair of stereo RCA cables (sold separately). If your source unit is not equipped with RCA outputs and only features speaker-level outputs, then you can cut off the included low-level/speaker-level input harness' RCA connectors (or use the optional Speaker Wire to RCA Adapters) and connect the KTP-445U to your source unit's front & rear speaker outputs.

Note: You will need to connect the amplifier's remote turn-on lead wire (blue/white) to your source unit's remote turn-on lead when connecting the KTP-445U via Low-level (RCA). You do not need to connect the remote turn-on lead wire when connecting the amplifier via speaker-level input, because the speaker-level inputs are auto-sensing.

Power/Speaker Output Harness: The Alpine KTP-445U's power/speaker output harness consists of a 16-pin proprietary connector on one end that plugs into the KTP-445U, and bare wires on the other end to connect to power/ground and your car stereo speakers through your vehicle's factory or aftermarket head unit's wiring harness.

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-445U.

Mounting: The Alpine KTP-445U Head Unit Power Pack includes cable ties to attach the amplifier to your vehicle's frame or chassis. The KTP-445U also includes two mounting brackets and four hex-head screws to fasten the amplifier to a flat surface of your vehicle.

 
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Alpine KTP-445U Power Pack Reviews

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Filter by rating:
5 out of 5

a little more juice

Written By Stan, michigan on Tuesday, August 12, 2014
Crutchfield Customer Review (What's this?)
 
I have added aftermarket speakera to my doors and dash and they were sucking the juice right out of my cd player. i hooked this little guy up and and now it sounds better than ever and has power left over.
Pros:
compact, works great, good quality manufacturing
Was this review helpful?    Yes | No
 
5 out of 5

Awsume Amp

Written By Mack, LaGrange, IN on Tuesday, July 08, 2014
Crutchfield Customer Review (What's this?)
 
Totally made my speakers come alive!
Pros:
Compact size fit behind my stock head unit!
Cons:
none
Was this review helpful?    Yes | No
 
5 out of 5

2011 gmc sierra extended cab

Written By Scott, Ky on Monday, June 30, 2014
Crutchfield Customer Review (What's this?)
 
Awesome little amp , installed it with factory unit with some alpine 6-1/4.
Pros:
Small, compact ,and a lot of power , different crossover points on amp a plus . Truck rocks now , need to add subs. Crutchfield customer service provided all the schematics on the wiring diagram. Overall good amp .
Cons:
Definitely not a plug and play , didn't like having to cut into factory wiring harness . If you have any experience in installing radios should be fine , was time consuming and had to lengthen speaker wires after cutting RCA 's off .
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5 out of 5

That added punch

Written By RMJ, Fredericksburg,VA on Tuesday, June 24, 2014
 
This amp gives my system that added punch that makes the tunes blast.
Pros:
Awesome little amp
Cons:
Nothing
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5 out of 5

Nice little Amp (2nd review)

Written By Juan, on Monday, June 16, 2014
 
Please read my previous comments of this amplifier for a more in-depth review of this product. After removing the power wire that ran from the amplifier and piggybacked off of the head unit. I decided to run the wire directly to the vehicles battery by simply piggybacking off the 8 gauge wire that ran to the amplifier powering my subs and this amplifier no longer suffers from clipping much better performance with the gaines adjusted at the 1 o'clock position
Pros:
Clean sound, better base and super tiny
Cons:
Running this Amp to the head units power supply doesn't work if you like it loud (must have its own power wire from the battery) despite what the instructions tell you!
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5 out of 5

works well

Written By Anonymous, st. peters, mo on Saturday, June 14, 2014
Crutchfield Customer Review (What's this?)
 
Paired this with a new Kenwood kdc-x598 and my older polk speakers in my fox mustang so that I could even be able to hear my stereo over my loud exhaust at cruise speed, but didn't want to have to mount it back near my sub and amp that I have setup for quick removal on track day. Was easy to wire up, plenty of extra wire in the harness to put it just about anywhere in the dash (and small enough too), used the rca inputs, and it sounds really good even without messing with the gain settings on the amp. I just used some strong velcro to mount it on the floor behind the reciever. Gives enough power to actually get clean mids and highs with the windows down at speed (bass was never a problem).
Pros:
Easy install, compact size, good power for a small amp
1 out of 1 people found this helpful
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5 out of 5

Nice Boost and stays hidden

Written By Hit the road, Moreno Valley, CA on Friday, June 13, 2014
Crutchfield Customer Review (What's this?)
 
It was nice to fit inside the dash and gave my speakers some more boost especially the bass.
Pros:
Nice and small. More Kick.
Cons:
Putting all the wires together.
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4 out of 5

Great little AMP!

Written By Rob H., Milner, GA on Tuesday, June 03, 2014
Crutchfield Customer Review (What's this?)
 
Great little AMP sounds great, easy to install and hide, would give it 5 starts however I had issues using my Infinity speakers rated at 3 ohms, amp kept going into protect, worked with the tech team and found that to be my issue so if your speakers are not rated at 4 ohms buy the Universal but great product!
Pros:
Easy to install and sounds great!
Cons:
Does not work on 2 ohm speakers
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5 out of 5

Small package big quality

Written By Harley rider, Chickasha, OK on Saturday, May 31, 2014
 
I installed this in my 2012 Streetglide in less than an hour. Amazing difference. It sets easily on top of stereo inside fairing. I had already upgrade the factory speakers so adding the amp gave me great sound and plenty of power left over if I decide to put speakers in my bags. Highly recommend for bikes
Pros:
Small, easy to install, good quality
Cons:
None
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5 out of 5

Alpine KTP-445U

Written By John, Northeast Ohio on Tuesday, May 27, 2014
Crutchfield Customer Review (What's this?)
 
I purchased this a while back to install in an Impreza. I finally got around to that and I am very satisfied with the improvement in sound volume and clarity. A very compact unit that delivers well for its price point. It is also easy to conceal. I would highly recommend this unit to those looking for a little more power in a package that will not take away from space. Others have complained of the poor instructions. I didn't have any trouble understanding the wiring or switch settings. Everything worked right the first time. If you understand wiring diagrams and color codes, this should be no problem.
Pros:
Small, good value, sounds great.
Cons:
none
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5 out of 5

The little amp that could...

Written By MisterMike559, Sanger CA on Saturday, May 03, 2014
Crutchfield Customer Review (What's this?)
 
You can not go wrong with one of these Alpine amplifiers. Whether, you go with the plug-n-play(KTP-445A) model, or the universal model; like the this one. This is the one to get, if you are not using a Alpine head unit, or a head unit that is not plug-n-play compatible. I started off with the the KTP-445A for my front and rear speakers since I have a Alpne CDE-147BT head unit. Sounded clean; and loud. But I was missing the sound imaging I was looking for. I finally added kick panels with components to tie up the mid, and high's in my system. I used this universal model amplifier to send the power to the kicks, via RCA cables. Wasn't sure if I was able to run both models, but a quick response from Crutchfield, reassured me it was possible. Wow, all I can say. Components in the doors and kick panels are the same Alpine models, but now; the system sounds so much louder. Sound imaging sounds so much more equal now. You can't go wrong with these amps. So compact, and simple to use. Hardest part was finding a place to place these. An with the size that they are, it didn't take long. When picking up this amp, get a 8 gauge amp kit, and some good quality RCA cables. Crutchfield can help you out, if you are not sure which ones to get. Make sure to set gain levels properly. That way you optimize this amplifier, and prevent any noise interference. The internet is your friend, when you don't know how to set amplifier gains.
Pros:
Compact Low power consumption Adjustment on crossover points 2-4 channel setup
Cons:
Requires a 8 guage amp kit. Con, only if you are not ready to run power wire from battery to cab. Setting gain too high can pickup noise. Setting gain to match head unit signal is vital in making sure you don't any noise.
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4 out of 5

Powerful little amplifier

Written By White Wolf, Arlington, TX on Monday, April 28, 2014
Crutchfield Customer Review (What's this?)
 
Small enough to fit in my fairing but powerful enough to hear at 100+mph. I am extremely pleased with this amp.
Pros:
Small, powerful, easy to connect.
Cons:
Dip switches underneath for settings.
2 out of 2 people found this helpful
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5 out of 5

Small amp, just right power

Written By Jason, Portland, OR on Friday, March 28, 2014
Crutchfield Customer Review (What's this?)
 
Works as it is supposed to. Easy install. Fits in nicely under my glove compartment.
Pros:
Small, easy to install.
Cons:
None that i encountered.
1 out of 1 people found this helpful
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5 out of 5

Big improvement, Small Package!

Written By Russ, AR on Tuesday, March 04, 2014
Crutchfield Customer Review (What's this?)
 
Bought this along with a Kenwood head unit to replace factory Silverado radio. I listened to the new door speaker I bought on just a head unit then on a small amp so I knew I wanted a bit more power. This little amp really livened up the JL Audio's in the truck! Easy install and sounds awesome! Called Mike at customer service with some concerns about not wiring straight to the battery but with his assurance that my trucks power wire was enough I went with the install as per instructions and have had no problems with clipping or distortion. I have an 18 year old son and he was amazed at the difference this little amp made to balance out the system!
Pros:
Very Small, runs off head unit power at full tilt with no problems! Great improvement over running just head unit power, really brightens up good speakers.
1 out of 1 people found this helpful
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5 out of 5

Deceiving Little Amp

Written By manooti, east stroudsburg PA on Tuesday, January 21, 2014
Crutchfield Customer Review (What's this?)
 
Installed this amp with a new hu from Crutchfield. It is powering the stock speakers in a 2006 Passat B6. All I can say is w.o.w. I expected clarity and got both ear bleeding volume and clarity. The amp is tucked in the glove box and still stays cool to the touch. Have no problems with install except the tiny little xover switches under the amp. Had to use a fine flat head.

Next test is how they run components after my stock speakers blow. >:)
Pros:
Wires are thick. Thicker than a new head unit from pioneer. Long leads. Stays cool due to class d. Front and rear crossover and gain control. Can be bridged in 2 channel mode for more power. Sounds awesome.
Cons:
Amp is nice but not when it needs its own power cable when radio fuse is under 15a. At this price, and then running power cable, might as well pick up a stronger amp. It is good if you know it will work for you. Also have a very slight hiss/hum with no audio. Lower gain, less hum but still there. Will not run power cable and use separate ground as it defeats the purpose of this amp. Crossover controls are too tiny to switch. Need a hobby flat head screw driver or a knife.
3 out of 6 people found this helpful
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5 out of 5

COMPACT YET POWERFUL

Written By BJK, OKC on Saturday, January 18, 2014
 
COMPACT AND POWERFUL FOR SMALL SPACES.
Pros:
VERY CLEAR CRISP SOUND AT NORMAL VOLUME. NICE COMPACT DESIGN.
Cons:
GETS A LITTLE DISTORTED A HIGH VOLUME
1 out of 4 people found this helpful
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3 out of 5

Nice little Amp but not if your using component speaker set up

Written By Juan, Chicago Heights on Friday, December 20, 2013
 
Nice little Amp if you want a cleaner sounding system and can afford an expensive amplifier or simply don't want to bother with installing one.... I installed this Amp in a 2006 impala with a set of Kicker components in the front and Kicker 6x9's in the rear using my RCA 5 Volt preouts from my double din eclipse deck ... Its not much louder than the head units amplifier but it will deliver deeper bass and crisper highs at a lower distortion rate, but if you turn up the volume to high for to long, this little Amp will CLIP!!! At least it does with my set up... I'm gonna try supplying a better fused power wire directly from the battery to see if it solves my problem and if that doesn't work than I'll turn down the gains on the amp... However the gains were adjusted using the method described in the instructions (standard method of adjusting gains)... I hope something works, otherwise I'm taking it out and running a real external amplifier.. To bad too because it sounds very good, I've NEVER had an amplifier clip at non-distorted volume levels, so I'm really hoping that piggybacking off the head units power wire is the problem
Pros:
GREAT SOUND, EASY INSTALLATION, SAVES MONEY
Cons:
Not Recommended if you like your music loud... This Amp will clip at high volumes
1 out of 4 people found this helpful
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4 out of 5

Big sound in a little package

Written By B-RAD, Indianapolis, IN on Friday, November 22, 2013
Crutchfield Customer Review (What's this?)
 
This is a great solution for some who wants a simple solution to add some kick to your factory installed stereo.
Pros:
easy to install, small enough to fit behind your radio in the dash. Great company in Alpine and not alot of money for what you get.
3 out of 3 people found this helpful
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5 out of 5

Amp

Written By Kevin, Arcadia,WI on Tuesday, November 12, 2013
Crutchfield Customer Review (What's this?)
 
Excellent and affordable upgrade from factory system. Paired with 4 Infinity Kappa 62.11i speakers and they sound great.
Pros:
Crutchfield customer service is the best
Cons:
None
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4 out of 5

Great amp

Written By Butchie, Washington on Tuesday, November 12, 2013
Crutchfield Customer Review (What's this?)
 
Great little add-on amp. I am playing this in my boat, so power consumption was a concern.....don't want to run down the batteries while at anchor in a remote harbor. My existing Bose161 speakers sound much better and the added base far better than before. I especially like the output control screws for front and rear channels, which allows for setting the initial balance between channels. The plug and play convince is great!
Pros:
Good sound, easy connections
Cons:
None
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5 out of 5

Alpine KTP - 4450

Written By Tim K, Sanford, NC on Wednesday, November 06, 2013
Crutchfield Customer Review (What's this?)
 
I have a 14 year old GMC Sierra Z71 truck and the factory stereo system finally bit the dust. Called Crutchfield for guidence and recommendations for replacing all of the factory equipment. I was a little apprehensive in purchasing this amp because of its size, but truly pleased I purchased it. There is noticeable difference with it and a really great product to be so small. The ol' truck sounds great now and extremely pleased with the performance. It is also very easy to store with its size. If your looking for a boost in your system this little amp does a great job.
Pros:
Sounds great, easy to install, compact size
Cons:
none
2 out of 2 people found this helpful
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5 out of 5

alpine amp

Written By Anonymous, metairie la on Tuesday, October 29, 2013
Crutchfield Customer Review (What's this?)
 
I bridged it down to 2 channel's & have it running a pair of focal coaxial & its soundd great plus with it small size it fit it the dash
Pros:
great product
2 out of 2 people found this helpful
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5 out of 5

Wow

Written By CalN, Bloomington, MN on Sunday, October 27, 2013
Crutchfield Customer Review (What's this?)
 
Wow, what a great little amp! I found the amp very easy to install and easy to adjust the gain etc per the factory instruction sheet(well written by the way)and a big plus is that it is so small it fit behind my Pioneer double din deck in my dash. The clarity and volume that it gives to my 4 Polk speakers is excellent, it really brings out the fullness of the low end in my 6X9's. This little amp is so worth the money and I am very happy I decided to get it!
Pros:
small size, easy to install(if you have a 15 amp or greater fuse), very easy to set up
Cons:
absolutely none
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5 out of 5

Mighty little amp!

Written By Mike K., Chicago area on Wednesday, October 23, 2013
Crutchfield Customer Review (What's this?)
 
What a great compact amp. I bought a 2013 Santa Fe and I wanted to keep several features made available to me through my stock stereo and I did not want to change the cosmetic look of the vehicles interior by swapping stereo heads. Having said that my stock stereo had no bass and lousy volume and I knew a stereo upgrade of some kind was in my near future. I turned to Crutchfield for advice and this amp was recommended to me. It sounded like exactly what I was looking for so I made the purchase and installed it myself. This amp made the difference I was looking for and I could not be happier. I want to mention that the compact size of this amp made it very easy to stash inside the dash board. If I ever need to gain access it all I have to do is remove the passenger side AC vent and it is right there. This is a mighty little amp that makes BIG sound!

Add the Kicker speakers and you have a great system!
Pros:
compact size, ease of installation, big sound
Cons:
none
4 out of 4 people found this helpful
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5 out of 5

great amp

Written By Anonymous, Altoona, PA on Sunday, October 20, 2013
Crutchfield Customer Review (What's this?)
 
Great amp really makes my system shine now installed behind my head unit with a little modification and makes a huge difference with my polk speakers you won't be disappointed if you buy
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4 out of 5

Good product

Written By ch, kentucky on Monday, September 30, 2013
Crutchfield Customer Review (What's this?)
 
product works well enough for what i wanted to do. I can't complain about it. I merely couldn't hear the radio when the Jeep top was down, and it boosts enough for me to hear now. Eventually i will get some higher end speakers and a sub to make it a bit better sounding.
1 out of 1 people found this helpful
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5 out of 5

Alpine KTP-445U Power Pack

Written By wortman, gaston, sc on Monday, September 16, 2013
Crutchfield Customer Review (What's this?)
 
The little amp that could and will
Pros:
small, light, easy power hook up, clear!
Cons:
cant think of any unless you are hearing impaired and need much more power.
1 out of 1 people found this helpful
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4 out of 5

PLEASE DO THIS BEFORE INSTALLING

Written By Jon, San Diego, CA on Friday, August 23, 2013
Crutchfield Customer Review (What's this?)
 
Like others have said, this amp has RIDICULOUSLY short input wires, which just makes it impossible to install. Do yourself a favor and either buy extra RCA cables if you're going to be using an aftermarket deck, or use long speaker wire to make the input wires longer. I spent about an hour connecting everything with the short wires, then discovered when I wanted to put everything back together I couldn't get the amp to fit anywhere because the wires were sooo short.

I have a ford edge and there's plenty of room behind the dash too. Like I said, just do yourself a favor and lengthen all the input wires, and you can also map out all of the color connections to your specific stereo while you do this as well, it will save you TONS of time.

As for how it improves the sound, there is a definite noticable amplification of sound with this installed. I upgraded my speakers first, added a sub, and then about 2 weeks later installed this power pack, and it does make a huge difference. I had to turn the gains all the way down and I still feel like I get a little distortion at higher levels so I wish you could turn it down even more, but maybe my Ford head unit just puts out of a lot of voltage or something...not sure.

I have it set with 120hz HPF and it definitely helps my 5x7 speakers with distortion, the sub takes care of anything below this. I tried 80hz and it didn't sound right, I kind of wish there was a 100hz setting but I can't complain...it sounds a LOT better.
Pros:
Small, space saving, no need to rewire your car.
Cons:
INCREDIBLY SHORT INPUT WIRES, you MUST lengthen them if you want to move this anywhere and have access to it! Also, it's not a very straight forward install -- if you have never done car stereo stuff, I would just take it to a shop and have them do it. No 100hz setting, only 60/80/120
4 out of 4 people found this helpful
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5 out of 5

Boom boom

Written By Super fish, West michigan on Saturday, August 17, 2013
Crutchfield Customer Review (What's this?)
 
I love the size of the unit, the power output is awesome and the size allows me to stick it under my front seat which is great. Perfect for what I needed for I love Alpine.
Pros:
Size, power output, ease of hooking up
Cons:
I wish I had stronger power output maybe 100 Watts so I could run a sub.
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5 out of 5

GREAT LITTLE AMP !

Written By John, Bethany Ok on Sunday, August 11, 2013
 
I bought this amp to clean up the power to my factory speakers in my 91 Dodge van, and it did that with gusto! The sound from my stock speakers is great now,for what they are. I can not wait to upgrade the speakers to Alpine Type S next !
Pros:
Easy to install Clean sound
Cons:
none yet
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5 out of 5

good amp in jeep jk

Written By Anonymous, GA on Saturday, August 10, 2013
Crutchfield Customer Review (What's this?)
 
Easy to install except the wires are too short. Used speaker-level lines for the connections. Good improvement in clarity for driving with the top down.
1 out of 1 people found this helpful
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5 out of 5

focus amp mini

Written By tutman, michigan on Tuesday, July 16, 2013
Crutchfield Customer Review (What's this?)
 
nice compact size. crutchfield recommended this using my stock car wiring. they matched me up with some polk speakers that works very well. the sound rips!!! i decided to keep my stock radio with the cd player and still sounds great. this little amp pounds those speakers and sounds great.

just make sure you get the correct speakers, crudchfield will advice you on the crooect stuff.
Pros:
small size, was able 2 install it behind the radio with some zip ties
Cons:
speaker inpit wires were 2 short, had 2 splice them with longer wires than splice that 2 the radio. just a little bit of extra work is all.
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4 out of 5

Alpine KTP-445U

Written By Justin S, Indianapolis, IN on Sunday, July 14, 2013
Crutchfield Customer Review (What's this?)
 
Great power for the size, quick and easy to install. The instructions were fine (not rocket science). I tried to adjust the built-in crossover and didn't hear much of a difference. My stereo sounds great, its crisp and clear while interstate driving with the windows down :)
Pros:
Size, easy to stash away almost anywhere.
Cons:
Careful where you put the amp, it gets hot! I'm considering relocating the amp with fan to cool it. Currently, my daily commute is 20 min. each way so not too worried about prolonged heating yet.
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4 out of 5

Clean power - but use the RCA level inputs!

Written By PatrickM, Plano, TX on Saturday, June 29, 2013
Crutchfield Customer Review (What's this?)
 
This unit was recommended to me by a Crutchfield advisor. The head unit in my system is a Kenwood KDC-X997. When I installed it, I used the speaker-level inputs and clipped off the RCA connectors and set the amp's jumpers. per the instructions included with the amp. With the gain trims set at halfway, the sound was screaming with the head unit level at only 10. I have an Infinity BassLink sub connected to the Kenwood's sub outs, and there was no sound coming out of the sub. The culprit: the sub-out signal from the head unit was simply not strong enough to drive the powered sub. The solution: turned both gain trims on the Alpin amp to minimum which then allowed the head unit to be turned up enough to get a good signal to the sub.
Pros:
Clean power and clarity.
Cons:
Make sure you use the RCA-level inputs on the amp
2 out of 2 people found this helpful
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4 out of 5

Great Sound Poor Instructions

Written By JimB, Lake Stevens, WA on Thursday, June 20, 2013
Crutchfield Customer Review (What's this?)
 
This little amp pumps out the power and really makes the receiver sound great!
Pros:
Great power and clean sound!
Cons:
The instructions are horrible! I had to call Crutchfield for help for the first time ever and blowing 4 fuses. The tech was great and got the stereo and amp running in a matter of minutes!
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5 out of 5

Perfect Power Booster for Jeep Wrangler

Written By Josh, Vail, AZ on Monday, June 17, 2013
Crutchfield Customer Review (What's this?)
 
If you are looking for a mild power boost that can be mounted out of sight behind the dash (at least in a 1997 Jeep Wrangler), this is an excellent option. My Wrangler looks like it has the original factory sound system, but it sure doesn't sound like it anymore!
Pros:
Compact (should fit behind dash) Noticeable improvement in sound
Cons:
Mild power boost May require running a separate line to the battery (1997 Jeep Wrangler only has 10A fuse on receiver circuit)
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4 out of 5

The Perfect Choice

Written By RobertP, Clemmons, NC on Saturday, June 08, 2013
Crutchfield Customer Review (What's this?)
 
The Alpine KTP-445U Power Pack was suggested by a Crutchfield salesperson as the one that would accomplish my goals of more power and cleaner sound. I would be installing it between a Pioneer DEH-X6500BT receiver and 4 Polk Audio DXi650 speakers, replacing the factory installed system in my 2008 Toyota Matrix. For my type of listening, it was the right choice. The sound is powerful and clear, but not overbearing. Installation was easy, using the straps provided with the unit, even though I had to adapt the unit to fit my particular situation. By using the StreetWires Zero Noise 5 Stereo Patch Cables that I purchased, the amp is proving to be exactly what I wanted.
Pros:
Compact size, clean sound, and powerful enough for most standard applications.
Cons:
None
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5 out of 5

Great upgrade

Written By tomg, WI on Monday, June 03, 2013
Crutchfield Customer Review (What's this?)
 
Great product, what an improvement from before. Very easy to install.
Pros:
compact size
Cons:
none
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5 out of 5

Little big amp

Written By Boz, Blue Ridge Summit, PA on Tuesday, May 21, 2013
Crutchfield Customer Review (What's this?)
 
A mighty mite. Good enough power to wake up most and quartet of speakers. Currently pushing a pair of Alpine Type R components and some soon to be replaced Polk db's. Yes , it makes the Polks cry. But the Alpines ROCK! I needed a good compact amp and this fit the bill perfectly. It allowed me to mount a 4 channel amp AND a monoblock amp in a very small space.
Pros:
Powerful, small, ease of use.
Cons:
A bit salty for its size/power.
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5 out of 5

WOW!!! Truly amazed!!!

Written By chaces1, NYC on Thursday, May 16, 2013
Crutchfield Customer Review (What's this?)
 
I bought the Polk db651s speakers to replace the stock speakers and to see if they would improve the music from the stock radio/cd player in my 2010 Accord. The speaker upgrade was fine but not enough volume. I bought the Alpine power pack and WOW!!!, at least a 100% increase in volume, and the clarity/quality of the music was significantly better. I went to a professional installer and at first he was skeptical because of the size of the Alpine 445U Power pack, but after he had it playing all he could say was WOW!!!
Pros:
Size (easily hidden) Lots of power, WOW factor.
Cons:
Had to go to a pro for a seamless install.
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5 out of 5

Nice little factory upgrade

Written By Jeremy, Indiana on Wednesday, May 15, 2013
Crutchfield Customer Review (What's this?)
 
This little Alpine amp is a great upgrade to my factory 2013 Jeep Wrangler Unlimited factory radio (U130). It at least doubles the power to be plenty loud to damage your hearing, you can pretty readily find somewhere behind the dash to stick it, and it just splices right in to the factory radio wires including no need to run power wires from the battery (which I did anyway for a Kenwood KSC-11 powered sub). I didn't have preamp outputs on the factory radio, so all I had to do was cut off the RCA connectors on the Alpine and splice line level wires right in to it. I do recommend adding extra wire to the inputs side for placement flexibility if using line level inputs (speaker wire works fine); I don't fault Alpine for this because preamp inputs would have used a longer RCA patch cable. I haven't heard any noise either adn that is just using the factory radio harness inputs. Some nice aftermarket speakers, like the Kicker 6.5" CS component and 2 way sets like I added go well with this and their 100 watt RMS power handling mean zero distortion and no way I can blow the speakers.
Pros:
size, relatively easy wiring for an amp
Cons:
Crutchfield didn't have a current wiring diagram but sent what they had & I figured it out by looking at the wires & cutting one set at a time, "only" 45 watts per channel RMS, adding a full amplifier with 60 or 100 W RMS like one of the new small digital ones wouldn't be much more complicated and pricing would be similar
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5 out of 5

Alpine KTP-445U Power Pack

Written By Mike, Western PA on Sunday, May 12, 2013
Crutchfield Customer Review (What's this?)
 
I didn't realize what I was missing! I needed to replace the factory amp in my 2002 Chevy Avalanche because it literally burned up leaving me with sound only on the left side. The install was not easy because wiring different colors from the amp to the vehicle harness could get tedious. The biggest problem was that the amp control wire from the Sony head unit and the wire from the amp are blue and white; in this Chevy, though it was pink. If I would have read a little more in the Avalanche Service Manual and the Crutchfield online sheet, I could have recognized it. But it went in and immediately I noticed the difference. It might not be a butt kicker, but it is a huge improvement over the factory amp that overall I was satisfied with. With new Kickers in the rear and recent Kenwood compnents up front, it's now a beautiful thing in my old Av!
Pros:
Small size made it easy to mount where the old amp was, and I even temporarily had it in the glove box. Easy connection to head unit. Plenty of wire length to tie output to the factory harness. GREAT sound.
Cons:
Terrible installation chart and directions- not logical and hard to read partly because they put 3 languages onto each line of the diagram. Also "instructions" for dip switches and remote wire were useless. Short RCA leads to head unit.
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5 out of 5

Cost effective upgrade

Written By angryshuna, Boston, MA on Tuesday, May 07, 2013
Crutchfield Customer Review (What's this?)
 
I have 2012 Impreza. Love the car, like the features of the head unit, bluetooth, aux cable, usb input, etc. Hate the sound. From reviews, I discovered that the speakers were fine but that the head unit put out a measly 10w per channel. I looked into and bought this product thinking that I could improve the sound without rewiring anything or gutting the head unit. Sure enough, paired with a breakout harness (mfr in, mfr out, all splicing between connectors), I was able to get this up and running in about an hour.

Huge improvement!!
Pros:
Great sound for little work and little $.
Cons:
Need room in dash for extra box and wiring behind head unit
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5 out of 5

Great amp

Written By gasman, michigan on Monday, May 06, 2013
Crutchfield Customer Review (What's this?)
 
Who says good things don't come in small packages? This one does. I was looking for something to add a little boost to my RV sound system. The magnadyne head unit just didn't have enough oomph. I started out by changing the speakers to Polks, but not enough power to drive them sufficiently with the receiver alone. I was on the fence about an amp so small, but didn't want the hassle of wiring a big amp if I didn't need to. With Crutchfield's 60 day try it or send it back if not happy policy, I figured I had nothing to lose. The other reviews of this amp were also good. Well, I'm glad I did. The system came alive. The only issue that I had was that there was initially some interference/ noise present. This was resolved by turning the gain down on the amp. I mounted the amp behind my seat, so I had to make a longer harness to reach the radio. The whole process was straight forward and the directions were accurate. I highly recommend this amp.
Pros:
Great price. Great power and clarity for a small form factor amp. Easy set up. Crutchfield service...
Cons:
none
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5 out of 5

Perfect fit

Written By Harley, USA on Tuesday, April 30, 2013
Crutchfield Customer Review (What's this?)
 
This unit fit in the tight space I had on my motorcycle. It was a perfect compliment to the Alpine IDAx200 head unit. I have the Polk Audio MM series speakers and the additional power gives them great sound at high volume.
Pros:
Great price, small size, RCA connections
Cons:
It took a little time to figure out wireing but not a big deal.
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5 out of 5

Powerful, Small Amp

Written By Aaron, Indianapolis, IN on Sunday, April 28, 2013
Crutchfield Customer Review (What's this?)
 
This little amp is awesome. I have a 2004 Honda CR-V and recently replaced the factory speakers with a couple pair of 6.5" Polk Audio db651s. I didn't want to replace the head unit but wanted more power coming through my speakers. One of the Crutchfield reps helped me find this amp which was a huge sound upgrade. This thing can really make the speakers scream. This was my fist amp install so I wanted a relatively simple one. Through a lot of research, YouTube videos, and a little Crutchfield technical support I had this guy installed an sounding great. Can't recommend Crutchfield enough. Great products, outstanding customer service, and an incredible company.
Pros:
Small Size. Lots of Power. Able to mount behind the dash.
Cons:
Most of the wiring is too short unless mounting directly behind the head unit, but nothing some additional speaker wire can't fix. Instructions could have been designed better.
2 out of 2 people found this helpful
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4 out of 5

Overall pretty good, but.....

Written By Patrick, Chester, VA on Sunday, April 28, 2013
Crutchfield Customer Review (What's this?)
 
I bought this little amp as a quick add-on and wanted some extra power, also to bypass the built in crappy IC chip amplifier that is found in just about ALL car receivers. What drew me was the bridging capability of "90 X 2" claim, it's small size, and can piggy back it's power from the car radio circuit. I use this in an older hatchback style Honda Civic with just the 2 door speakers. Plugged into a Pioneer DEH-9500BHS, with some Pioneer 6.75" D170's, it was a significant improvement over the radio's built in amp. I did notice that this amplifier can "clip" easily if overdriven, which can potentially damage your speakers. I called Crutchfield and they said maybe the gain was set too high. I don't think it's the amp, just what it is. Not sure if it will clip in 4 channel mode, but I'm only driving the 2 Pioneer door speakers-which are super efficient. I played with the gains taking note not to set them above the halfway mark. I turned them down a bit and was about to get a little more out of the amp, but it will still clip if the volume/bass is set too high. Overall not bad for the money, but don't expect a miracle or to blow the doors off. Kind of reminds me of the "add-on power boosters" sold at cheaper dept stores from the late 70's & mid 80's. If you're looking for more power in a small size, they're other amps out there for about the same price, maybe a little more. The only downside is you'll have to buy an amp wiring kit and long RCA patch cords.
Pros:
Size, Price, Sound improvement
Cons:
Can clip easily, touchy gain controls, short RCA plugs
1 out of 3 people found this helpful
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5 out of 5

Just Right

Written By Steven, Charleston, WV on Saturday, April 27, 2013
Crutchfield Customer Review (What's this?)
 
Installed in a 97 Jeep Wrangler. Install along with Kenwood KMM-100U reciever and Polk Audio speakers. Being in a Jeep (i.e. tent on wheels) I wanted to get something to push a little more power to get more volume and to also get a little more clarity. Based on Crutchfield reps recommendation this was perfect. It is small and fits behind the receiver and is out of sight. (invest in zip ties)

Wiring it was a bit tricky but made sense once I did it wrong the first time. Wiring still went fast. You basically end up wiring all of you main wires was from the input side and you speakers you wire in from the output side and you are good to go.

This unit does as advertised. A lot more clarity and detail in the sound. More power what was 35 on the volume scale of my reciever is now a 25 -26. No distortion at the higher volumes either.
Pros:
More clarity and detail Great recommendation for something I would never have found on my own Out of the way
Cons:
For non Alpine units you have to think through the wiring (you may need extra speaker wire as well as the output side is a bit short)
1 out of 1 people found this helpful
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5 out of 5

"Power Pack" says it ALL! Class D amp = A+

Written By Toddman, N.Tx on Saturday, April 27, 2013
Crutchfield Customer Review (What's this?)
 
I have been looking for a small amp to power my Infinity front & rear door speakers in my '00 Sierra. I upgraded the head unit & the speakers awhile back & didn't feel the need to get an amp at the time. I didn't know what I was missing until I hooked this baby up. My sound system came alive with the sound I new it could produce. It wires right into the factory harness adapter that was used when adding the Pioneer head unit. Everything is color coded for easy installation. You can use preamp input or line level inputs depending on your head unit. ** Don't forget to get some Posi-ProductsT Car Stereo Connectors they'll make the job A LOT easier. ** It has all the controls you'll need like crossover points & gain controls in a small compact case. It will really surprise you for it's size & it's a CLASS D amplifier! To round out my system I added the Sound Ordnance B-8PTD under the backseat to fill in the bass.
Pros:
Class D amp Compact size, compact price Easy to install (wires inline with radio) Alpine quality sound 4 channel or 2 channel application
Cons:
Wire leads a little short
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5 out of 5

WOW

Written By Anonymous, clinton md on Monday, April 08, 2013
 
I was very hesitant but im glad i chose this amp. It brought my speakers to life with no distortion at all alpine 6/9s next thanks for your advice crutchfield all the advisors are great
Pros:
Fair price
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5 out of 5

04 Wrangler Sport Stock HU

Written By wedu22, Groton, CT on Monday, April 08, 2013
 
Great item and was exactly what I needed to for my Stock Radio in my Wrangler. Small & easily concealed from prying eyes. Really surprised at the boost it provided to my OEM HU.
Pros:
Small, powerful & great sound!
Cons:
Original concept was for plug & play into Alpine stereo's easy to connect. The 445U (U for Universal) concept would have been better designed with longer RCA connections.
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5 out of 5

Alpine KTP-445U Power Pack

Written By Anthony, Houston, Texas on Saturday, March 09, 2013
 
This little thing blew me away with the power it has. I have it running a set of Boston SR-60 components in the front and a pair of Alpine SPR-69 in the back of my 2010 Nissan Altima coupe and this amp gave an immediate sonic improvement. Detailed mids and perfectly bright highs along with adequate bass (for what my current speakers are). Once again, Alpine makes another landmark item for car audio enthusiasts.
Pros:
Great concept for my needed application, very high quality
Cons:
Wish Alpine would make a 100 watt version, short RCA cables, tricky crossover location if its mounted to a solid surface
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4 out of 5

Good product.

Written By 9859limited, Massachusetts on Sunday, February 03, 2013
 
I had my doubts this amp would make any difference but let me tell you it has cleaned up the sound of my system very nicely.
Pros:
small, easy to hide, inexpensive, and pretty simple to install.
Cons:
non really just wish alpine could make one with more power output.
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3 out of 5

sound quality

Written By Anonymous, Washuington state on Monday, January 14, 2013
Crutchfield Customer Review (What's this?)
 
I messed up by ordering the univeral unit instead of the plug and play unit, my fault. Crutchfield offered to exchange it but I proceeded with what I had. It works very well and I am pleased with the high power output. However when I increase the volume to a level I would not normlly use, it cuts out momentarily. I set the dip switch as recommended but something is wrong here. Overall a huge upgrade. I combined an Alpine CDE-134HD with this for use in a class C motorhome. I did a speaker upgrade last year.
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4 out of 5

2009 Hyundai Santa Fe (Stock Radio)

Written By mobrien1968, Long Island, NY on Thursday, January 03, 2013
Crutchfield Customer Review (What's this?)
 
Purchased this amp for my 09 Hyundai Santa Fe w/ stock (Non Infinity) system. In order to install this without cutting any of the factory wiring (and to ease the installation), I purchased the Parrot bluetooth harness ($30, Crutchfield). Without the harness this amp would have been a whole day project. In agreement with the other reviewers, the wiring harnesses included with the amp are WAY too short. But all said and done, it is a huge improvement. The separate front/rear crossovers help in tuning it, as the front speakers are different from the rears (component vs full range). I was able to cancel out the low freq. bass from the rears, which could not handle it very well. I would have rated it 5 stars if it wasn't for the short wiring harnesses included with the amp.
Pros:
Small size, can mount almost anywhere, does not require direct power from the battery (low current draw)
Cons:
Included wiring harnesses way too short, unless you can mount the amp directly above or below the radio. Instructions somewhat hard to read (small print).
2 out of 2 people found this helpful
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5 out of 5

2005 Camry LE (JBL)

Written By Maxberry, Cincinnati, Oh on Friday, December 21, 2012
 
This Alpine Power Pack works great on my 2005 Camry (JBL) system. I upgraded my factory JBL receiver to the JVC KWAV60 and put this Alpine on and new speakers. Whole new ball game. This thing is great. Make my speakers sound so much better. If you have that factory JBL Amp in your car you must get the "Metra 70-1761 receiver wire harness For select 1987-up vehicles" also sold by Crutchfield. This Metra 70-1761 harness will bypass the old JBL factory Amp so you can put the Alpine Amp on - connect these (comes as two harnesses) to the car harnesses just below the receiver.. So make sure you don't get the "Metra 70-8113 Toyota Receiver Wiring Harness For select 2000-07 vehicles with factory amplifier" because this harness will integrate the factory JBL Amp than you can't use another amp. I had to find out the hard way. Hope I helped other Camry owners..

Pros:
Sounds great and it's almost plug and play.
Cons:
None
2 out of 2 people found this helpful
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4 out of 5

Great product!

Written By Matt, Santa Fe nm on Saturday, December 08, 2012
Crutchfield Customer Review (What's this?)
 
Great product and sounds great!
Pros:
Easy to install and sounds great!
Cons:
The wires on the unit are short, which limits where you can mount it.
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4 out of 5

2012 Ford F-150 XLT with Sync

Written By Joseph, South Carolina on Wednesday, December 05, 2012
Crutchfield Customer Review (What's this?)
 
I was able to make this a plug and play amp by following online instructions. Just Google it. By doing that I was able to drive a pair of Infinity speakers giving the truck a much clearer sound. The install is easy and the sound is great. I recommend highly.
Pros:
Ease of installation. able to use a Metra Bluetooth harness to make it plug and play.
Cons:
Had to take dash apart several times to adjust sound and move wires. The sound to the front right kept cutting in and out.
1 out of 1 people found this helpful
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5 out of 5

Does the job

Written By Midniteradio, gainesville ga. on Wednesday, November 21, 2012
Crutchfield Customer Review (What's this?)
 
I Installed this amp in a second car I use to run about town in a week ago. Paul at Crutchfield helped me complete the install when the instructions got vague near the end, thanks Paul. The entire install was an entry level job, entry level Alpine CDE-121 head unit, 6x9 Alpine E-series in back, and cheapo Kicker 11DS60 6.5" 2-way Car Speakers in front and this little amp makes them pack all the wallop they can. After playing with the amp settings I am happy with the sound and considering the entire car stereo install was about $350 I am pleased to have this unit. I usually run winamp through my phone for music and the 10-band eq in winamp makes this entry-level system sing. I recomend this power pack.
Pros:
Clean power, size, options.
Cons:
Instructuons are lacking, big time.
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5 out of 5

great little amp

Written By wayne g, slidell,la on Thursday, November 15, 2012
Crutchfield Customer Review (What's this?)
 
got this to try with a jvc head unit and it rocks.if your thinking about it, stop and just BUY ! you won't be sorry. althou it won't blow the windows out,it will add clairty with the right amount of kick
Pros:
price,size,ease of install
Cons:
none
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5 out of 5

awesome little amp

Written By Mark in ohio, Findlay, OH on Saturday, October 20, 2012
Crutchfield Customer Review (What's this?)
 
Using with polk db's 6.5 inch x 4. Sounds great and makes factory deck 10x's louder in my Kia Forte. does fit behind dash too.
Pros:
Sound. size. quality.
Cons:
None
1 out of 1 people found this helpful
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5 out of 5

A BIG surprise from small product.

Written By Darryl B, Lansdale Pa on Wednesday, October 17, 2012
Crutchfield Customer Review (What's this?)
 
Bought this amp to boost the signal form my JVC HU. What a difference! Full Range mode really makes the speakers scream while being clear. The physical size of the amp made it a breeze to tuck away. If you buy this amp. you won't be disappointed.
Pros:
small compact design. Long wires on the harnes makes it easier to find the right location to mount,
Cons:
Non yet...
1 out of 1 people found this helpful
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5 out of 5

best ever

Written By Anonymous, fargo nd on Wednesday, October 10, 2012
 
Purchased to run to run a set of alpine type S components in the front and a set of alpine type S 6 and a half in the back sounds amazing
Pros:
Easy to hide behind dash great price for the amount of power
Cons:
Haven't found 1 yet
1 out of 1 people found this helpful
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4 out of 5

Alpine KTP-445U Power Pack

Written By John M, Vernon, NJ on Tuesday, September 25, 2012
Crutchfield Customer Review (What's this?)
 
EASY INSTALLATION USING FACTORY SPEAKER WIRES
Pros:
small size fit behind dash, high and low onputs, low and high filters, clean sound, price
Cons:
short wires, had to add more wire to reach head unit
2 out of 2 people found this helpful
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4 out of 5

Very Nice

Written By Mr. Mike, Adamsville GA on Saturday, September 22, 2012
Crutchfield Customer Review (What's this?)
 
This little thing gets the party started. I use to have to turn my radio up to around 15 to drown out the road noise when the windows were down, and now the same level is achieved at somewhere around 6. It is small enough to be hidden easily, but it was not small enough to fit behind my head unit as the add suggests. Maybe if I did not have a double-din sized head unit, then it may fit. It features a high pass filter for the front and rear channels, so you can keep those lows away from your delicate speakers. The best thing is that you don't have to run an amp wire through your firewall, because it can work off of the wires that use you use to connect your head unit. I would recommend this to anyone.
Pros:
Small, Powerful, Hi pass filter
Cons:
Not quite small enough to fit behind the head unit if you have a double-din unit.
1 out of 2 people found this helpful
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4 out of 5

WHAT A DIFFERENCE!!!!!

Written By LARRY M., PASCO WASHINGTON on Wednesday, September 12, 2012
Crutchfield Customer Review (What's this?)
 
If u have an under $300 stereo system then this product is well worth the purchase. Poor quality before purchase and what a difference after installation!!!!!!! Enjoy the results.....
Pros:
Easy install with no special wiring or equipment. Excellent quality for the price!!!!!!
Cons:
Not marked as to the stereo wiring in and speaker wiring out.
1 out of 1 people found this helpful
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5 out of 5

ktp 445u

Written By eddie h, chicago il on Sunday, September 09, 2012
 
great upgrade to any system stock or aftermarket.so much easier to install than any other amp instructions show you different options of installation which is great.this amp really kicks hard just make sure you adjust the amp as per instructions.i would not recommend this amp if you are still running stock speakers because it wont really sound any cleaner just louder so aftermarket is the way to go on the speakers.
Pros:
easy install clean sound even at high volumes impact amp will fit anywhere
Cons:
wiring harness a little short
2 out of 2 people found this helpful
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5 out of 5

Power Box Amp

Written By Marcos, El Paso on Tuesday, September 04, 2012
Crutchfield Customer Review (What's this?)
 
Excellent addition to my HU, made my car speakers come to life, very compact and easy to hide behind my HU in the dash area. (2012 Honda Ridgeline)
Pros:
Compact and enough power, no running wires.
Cons:
If you want to be heard coming down the street, get a more powerful amp.
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2 out of 5

Hard to hook up

Written By Anonymous, Hawaii on Friday, August 31, 2012
Crutchfield Customer Review (What's this?)
 
Had to return the amp because I was told it was plug and play...far from it. Had to actually cut the RCA jacks to hard wire...still did not work...finally after 4 hrs and 3 calls to tech support at Crutcfield, eith no real help..sent it back. Really wanted the extra power, but way too much involved to hook up to my new Alpine deck, especially this day in age.
1 out of 23 people found this helpful
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5 out of 5

Just perfect w/137bt

Written By Steve Mac, Missouri on Thursday, August 30, 2012
Crutchfield Customer Review (What's this?)
 
Works great w/137bt!
Pros:
Fits rite below the head unit in a 05 Liberty!
Cons:
None so far!
2 out of 3 people found this helpful
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4 out of 5

Good amp, just not for me...

Written By Chris, Lexington, KY on Friday, August 24, 2012
Crutchfield Customer Review (What's this?)
 
Giving it 4 stars because it's well built, puts out what I thought was good sound, the size is great, EASY installation with power/ground wires going to car harness, and overall quality is excellent. However, I have an 07 Corolla with a Dual head unit and Infinity speakers front and rear. With the proper settings on the Dual, believe it or not, I really couldn't hear any noticeable difference in the quality of sound. Based on the reviews, I was expecting cleaner and greater sound, but just didn't happen. I tested my system with the amp, then immediately after without the amp, and immediately decided it wasn't worth keeping, at least not in my car. If and when I get another head unit, or maybe another car, I will definitely reconsider this amp. One thing I noticed was how warm the amp got after a while. I would recommend this amp for anyone looking for good quality, and if your system is in need of decent power.
Pros:
Size, easy install, good quality build.
Cons:
Got fairly warm.
1 out of 3 people found this helpful
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4 out of 5

Alpine amp

Written By BillyD, Myrtle Beach, SC on Tuesday, August 21, 2012
Crutchfield Customer Review (What's this?)
 
I really like the size of this amp and the power it puts out, Especially how it connects to the harness power wire. NO running wires through the firewall to the engine battery. There are many ways to install (RCA, wire harness) and the settings are convenient along with the gain knobs. I would purchase this product again.
Pros:
Cool design, very small for 45watts of RMS! Adjustments easily modified.
Cons:
Very short harness doesn't allow you to give much distance from the amp to the head unit. Currently have a lot of static in my speakers, Assume its due to the amp being so close to the head unit and the ground wires all sharing the same terminal.
1 out of 2 people found this helpful
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5 out of 5

alpine 445 power pack

Written By John R, Marshall,N.C. on Saturday, August 18, 2012
Crutchfield Customer Review (What's this?)
 
Could not be happier with this purchase! Easy to install and will fit just about anywhere..Plenty of power for me!
1 out of 1 people found this helpful
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5 out of 5

Good amp for price

Written By Chaz, Cleveland on Friday, August 17, 2012
Crutchfield Customer Review (What's this?)
 
I had a very good recommendation from associates for this equipment. Gave me all the info I needed to install and good product for the price
Pros:
Easy to install even with OEM equipment
Cons:
None
1 out of 1 people found this helpful
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5 out of 5

Alpine is Fine

Written By David R, Lewisburg, WV on Tuesday, August 14, 2012
Crutchfield Customer Review (What's this?)
 
This little amp is just what the Doctor ordered, small but yet powerful & very clean sound. I paired it with a new Alpine CDE-122 head unit with some new JBL 5 1/4" coaxials, what a difference. I already had a amp/sub in the trunk so this update really blended everything great!
Pros:
Small, simple hookup, provides efficient good clean power to all 4 speakers. Would definatey recommend & would purchase it again.
Cons:
None
5 out of 5 people found this helpful
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4 out of 5

Easy To Install

Written By 42 years old, Indiana on Saturday, August 04, 2012
 
I was a little hesitant to get this amp from reading the reviews on installing this amp, but I decieded to get it anyway and see for myself. My skill level is I have installed 5 car stereos in 25 years and this was my first amp I installed. So I get the amp open it up look at the directions then look at the wire harness that comes with the amp. Ok looks pretty easy go out take out the stereo and 20 minutes after I pull the stereo out I have it wired and working. Nothing to it. Directions were easy to follow. The hardest part was trying to find a place to put it with the short wires. So I went out and bought some wire, spliced it in, and GOOD TO GO. 4 stars four the wires being to short.
Pros:
Lots of sound, easy install
Cons:
Wires on the HU side are around 6 inches long
4 out of 4 people found this helpful
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4 out of 5

Great amp for small spaces.

Written By JAKSON, Marlton, NJ on Wednesday, August 01, 2012
Crutchfield Customer Review (What's this?)
 
I recently purchased a mint condition 2001 Jeep Wrangler Sport LANDRUNNER EDITION. As many jeep owners know we are LIMITED on space to put any accessories anywhere in a Jeep. This small but powerful amp is weel worth the price. I now can here my after market stereo with the doors off and the top down cruising down the PA TURNPIKE at a good speed. I would have given the amp 5 stars if the wires on the input side were longer. I don't know what Alpine was thinking because in the direction they state do not mount amp close to the head unit. Well easier said than done. Other than that I Love this product and a couple of my friends are in the process of buying the same amp.
Pros:
Compact size, mega power. Perfect value.
Cons:
WIRES WIRES WIRES.
3 out of 3 people found this helpful
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4 out of 5

Exceeded Expectations

Written By Curt D, Chaska, MN on Tuesday, July 31, 2012
 
I bought this amp as an upgrade from an OLD Alpine amp that was rated for 20W/ch. I'm running it in two channel/bridged mode driving my front speakers. I have the power lead hooked into the distrubution block with my other amp and 8AWG wire from the battery. I was initially sceptical of the 90W rating for such a small package. Boy, was I pleasantly surprised the first time I fired it up! It is ROCKIN my Boston coaxials plus seperate tweeter set. There is a great improvement in bass and accuracy. String instruments actually sound like string instruments again and I'm getting decent bass in the front of the car. Now I know my speakers are performing to their full potential. I have to disagree with some other reviewers about the instructions, I thought they were very complete and easy to understand. I do have a very low level alternator whine like others experienced. I have not tried the ground isolators yet. In two channel mode this amplifier is for real.
Pros:
Really has the power to back up the specs. Clean, pleasant signature Alpine sound. Well worth the price.
Cons:
Suseptable to picking up noise. Filter module on the power lead is a little cumbersome if you want to pull the lead through a small space.
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4 out of 5

Not as easy to install as the old model

Written By Stonefish, NH on Friday, July 20, 2012
Crutchfield Customer Review (What's this?)
 
When I got this I was expecting the old "plug and play" model, so I was a little surprised to find that it wasn't going to be that easy. Installation was a bit of a pain, the wires on the side that inputs form the head unit aren't even CLOSE to long enough. I ended up cutting off all the plugs and extending the wire