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Alpine - Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter - Black

Give your car stereo system a power boost with this Alpine Power Pack KTP-445U 180W Class D bridgeable 4-channel amplifier that features a 12dB/Oct high-pass filter for powerful sound.
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Overview

Best Buy Customer Reviews

5
Great little amp Posted by: from: Central Florida on This is a great little amp if you buy good speakers and don't want to run a bunch of wires. My A4 factory system sounded pretty bad. I started off with a new Pioneer head unit and that helped, but it would distort at high volume. Next I bought four 2ohm component speakers that were said to run fine on low rms wattage. They did not. I when with the power pack because 45 watts rms would be plenty and it looked small plus I wouldn't have to run a bunch of wires. The system gets pretty loud now, but the best part is, it remains crystal clear. My days of booming bass are long over, but has my system sounding louder and most importantly, cleaner than any of my old cars. The amp fits perfect in the top rack in my glove box. When I bridged the amp (90 watts rms), it actually gave the front speakers too much power. The speaker are rated at 2-90 watts rms. overall I would say I'm very happy.

9 out of 9 found this review helpful.

5
Excellent little power house for door speakers Posted by: from: Worcester, MA on This is a great little power amplifier for those of you with the need for more power than a typical head unit, but at much less cost and space of traditional amplifiers. The amplifier has both RCA and line-level inputs (cut the RCAs to use line-level) as well as a dip-switch controlled crossover. Very clever. You can use factory speaker wiring if needed, but do not recommend using this amp on factory speakers. They will not handle the power, will distort, or even become damaged. Rated at 45 watts RMS x4 channels, this little power brick can be bridged to 90 watts RMS x2 channels. I'm running 90 watts RMS x2 (bridged) into a pair of component 6x9 speakers in a Jeep Cherokee and it works great! Way better than the 25 watts RMS that the Alpine deck I have provides. Although very powerful for the size, DO NOT use this amplifier to drive subwoofers. Digital amplification has come a LONG way in the past 5-10 years and the musical nuances are fully preserved. Make sure that you have a power source that can supply 15A. I tapped into an unused cigarette lighter right in the dash and was done with installation in under 1 hour.

4 out of 4 found this review helpful.

5
Better sound for your stock head unit Posted by: from: New York, NY on I have a 2012 Prius 3 with Entune Navigation, so I did not want to replace the head unit but the sound was terrible. I read the installation instructions and saw that it can be used with the same power supply as the head unit. I was concerned that wiring a bigger amp directly to the 12-volt battery might affect my MPGs. In order to make this plug and play (no splicing of factory wiring), I bought a regular harness and a reverse wiring harness. I spliced the wires for power, ground, etc, and wired this amplifier in between the two harnesses for the speaker in/out. If you're using speaker level output, remember to turn the gain down otherwise you will hear a loud hiss. Sounds great! The sound quality is consistent with both the volume high and low. My friends noticed the difference without me mentioning I installed an amp. However, don't expect this to produce neighbor-annoying sound volumes. This amp does less amplifying and more signal "cleaning".

3 out of 3 found this review helpful.

5
Best bang for the buck 4-channel Posted by: from: Michigan on for an amp that can be mounted behind most vehicles glove boxes, this baby packs a real punch! This amplifier while small, delivers more than double the wattage to your speakers than an aftermarket radio will. In saying that i actually had to turn it down after i had installed it because it produced so much volume even in an open cab SUV. The signal to noise ratio isn't great but for $150 compared to $200+ for a standard 4-channel and then add wiring on top of that and still have it mounted to a seat, or enclosure or under a seat where it can be in the way... no thanks I'll hide it behind the dash. I will recommend this to all my customers. Geek Squad Autotech approved.

17 out of 23 found this review helpful.

5
Great compact amp Posted by: from: on The size and power is perfect for my application. Needed more power than stock head unit in my GTI to power door speakers. Fits very easily in the dash below head unit

2 out of 2 found this review helpful.

5
Outstanding mini amp Posted by: from: Buena Park, CA on I bought this power pack along with my Pioneer AVH-X3500BHS and i must say that it was a great purchase. I had stock speakers and saw an improvement right away, and then switched to after market speakers and was blown away by the crispness of the amplified audio. It has a 2 channel or 4 channel option with 60hz/80hz/120hz bypass switches. It hooks up in between the stereo harness and the harness adaptor for the factory wiring. It is powered by the factory wiring so no need for an amp install kit or anything like that. The instructions are pretty clear for those who are DIY'ers (Me) and i had no problem locating it in a hidden spot for less clutter. It has 4 female rca outputs so getting double male adapters or X male SPLITTERS would help wiring them. You also have the option to wire them at stereo level. All in all i am very pleased with the amp, saves a ton of time installing over traditional 4 channel amp and running a bunch of wires from the speakers to the amp etc.. Keep in mind this amp is for most setups that are average. It wont win any competitions but it will give you a boost to the real crisp sound you want to hear on stock or lower end aftermarket speakers.

3 out of 3 found this review helpful.

5
Worth every penny! Posted by: from: Atlanta, GA on This amp is awesome. It powers all 12 of my speakers so well that my kids complain when the volume is at 6. I've had it as high as 16 and could barely stand it because it's so loud. I really don't know how high the maximum volume is because my ears would explode. I mean this in the best possible way. It gets louder, NOT distorted. I coupled this with the Alpine CDE BT137HD head unit (see that review for further info) After a worthless, expensive, more bells than whistles Sony touch screen head unit that I replaced in a matter of weeks, this is so much more bang for the buck!

4 out of 4 found this review helpful.

5
Great addition in a small package Posted by: from: on I own a 2013 Jeep Wrangler Unlimited with a soft top and base radio. To say the least I need more power to run my 4 6.5" speakers plus needed a small unit because of limited mounting locations because I use my Jeep offroad. This unit supplied the perfect power I needed plus great options to tune my speakers properly and was able to mount it behind the dash next to the radio. Install was straight forward and easy and I have limited skills. I would recommend this alpine unit to anyone.

4 out of 4 found this review helpful.

5
The perfect compromise for most listeners! Posted by: from: Central WI on This is the piece the car audio world was waiting for. It's been out a while and I still am in love with it. Keep in mind, the ratings on this from Alpine are *overrated*. This isn't going to do 45x4. I see more commonly 35-40wrms per channel. Still double of what you get with a headunit (which is about 15-20wrmsx4#. Most speakers in the mid-level category love running on this, JBL, Alpine E or S series, Kicker, etc... this is a perfect contender to get that 'little extra' where the headunit isn't quite doing it, but a full size 50w+ per channel amp just isn't necessary #or too expensive#. You don't need a run to the battery in most cases for power, so install is simple. Keep an eye on the dipswitches when setting it up, if you look at the diagram wrong youll be 180* off on each dipswitch setting for tuning it, lol. Also, this is great to run 2 channels bridged to keep a factory Honda or Subaru sub working when replacing the headunit in some cases. Versatility, double what a headunit puts out for power, and inexpensive. Perfect for the casual listener who demands more than entry level, but doesn't require a ridiculously expensive audiophile system.

2 out of 2 found this review helpful.

5
Makes the stereo sound great Posted by: from: on I put this in my Jeep Wrangler and I can now here my stereo with the top off and it sounds great

1 out of 1 found this review helpful.

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