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

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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

What's Included


  • Alpine Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter
  • Wiring harness with RCA connectors
  • Owner's manual

Ratings & Reviews


Overall Customer Rating:
97% of customers would recommend this product to a friend (418 out of 431)

Features


Geek Squad® installation

is strongly recommended for this product. Please visit your local Best Buy store for details.

Handles up to 45W RMS (continuous) @ 4 ohms or 2 ohms

For powerful sound. Up to 90W continuous bridged.

12dB/Oct high-pass filter

Along with variable gain ensures flexible operation.

4 ohms bridged impedance

Conducts power evenly to keep the speaker at an appropriate level.

RCA and auto sensing speaker-level connectors

Enable simple installation.


Overall customer rating

Rating: 4.7 out of 5 stars with 431 reviews

97%of customers would recommend this to a friend

Pros

Cons

Most helpful reviews

See all customer reviews
  • Rating: 5 out of 5 stars

    Best bang for the buck 4-channel

    Posted
    basswagon
    • My Best Buy Premier Silver Member

    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.

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    Great little amp

    Posted
    gymmie
    • Verified Purchaser
    • My Best Buy Premier Silver Member

    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.

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    Great addition in a small package

    Posted
    Nhfd01
    • Verified Purchaser
    • My Best Buy® Elite Plus Member

    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.

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    Excellent little power house for door speakers

    Posted
    SINTZ

    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.

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    Perfect compact amp.

    Posted
    trikedoc
    • Verified Purchaser
    • My Best Buy® Elite Member

    I put this on H-D tourer. It is perfectly suited for under the fairing placement. I can hear tunes at highway speed and at lower volume settings. Easy installation.

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    Better sound for your stock head unit

    Posted
    KNYC
    • My Best Buy® Elite Plus Member

    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".

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    The perfect compromise for most listeners!

    Posted
    StallationGuy

    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.

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    Great AMP

    Posted
    Johnsonjam02
    • Verified Purchaser
    • My Best Buy® Member

    I was worried that it was not powerful enough. All of the car audio people I know told me it would suck. The Bestbuy installer told me to trust him. He was right. I love it.

    I would recommend this to a friend




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