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How to install the Alpine KTP-445 Power Pack

Upgrade your car stereo with this compact, powerful amplifier

This video demonstrates how easy it is to install the Alpine KTP-445 Power Pack amplifier module. The Power Pack bumps up the power output of your Alpine stereo to 45-watts RMS per channel, giving your music increased clarity and detail. You get the power and improved sound of an external amplifier at a fraction of the cost and with a much easier installation.

Note: Since this video article first appeared, Alpine replaced the KPT-445 model with the KTP-445A, which works the same way as the KTP-445.

Read video transcript

In this short Crutchfield video we're borrowing a coworker's Jeep to show you how easy it is to install the Alpine KTP-445 Power Pack. The Power Pack is an add-on, 45-watts per channel amplifier module that works with Alpine stereos.

Installing the Power Pack is really simple. It connects between the stereo and the original Alpine wiring harness. First you'll have to remove your stereo from the dash. Carefully pull off the trim ring as we've done here and use the removal tools that came with your stereo to release the locking clips on the sides. Then pull out the stereo and carefully unplug the wires and set it aside.

Next find a place to mount the Power Pack behind your dash. Alpine made the wires long enough to reach the stereo from just about anywhere in the dash. In our case, we were easily able to stick the Power Pack right behind the Jeep's glove box.

Now it's time to hook it up. Plug one end of the Power Pack's wires into the harness that's already connected to your cars wiring, then grab the stereo and plug the other connector from the Power Pack into the back of it. One nice thing is that the plugs only fit one way and that makes it easy to get right.

Now carefully re-install your stereo and guess what? You've more than doubled the power in your Alpine stereo without the extra work of installing an outboard amp and that extra power will bring out musical details you weren't hearing before. You can learn more about the Alpine Power Pack at crutchfield.com/KTP445 or give us a call at 1-800-555-9408.

  • Doug Rose from Tampa

    Posted on 6/13/2022

    I have a 2014 JKU with the factory alpine system. Will there be any issues with the factory amp with the KTP445a?

    Commenter image

    Buck Pomerantz from Crutchfield

    on 6/15/2022

    Doug, The KTP445 amplifier only works with an aftermarket Alpine receiver without a factory amplifier.
  • Michael Roy from Ottawa

    Posted on 3/25/2021

    Is there some kind of harness to make this job easier? I'm looking to install the Alpine KTP-445U with my factory head. unit in a 2017 Jeep Wrangler

    Commenter image

    Buck Pomerantz from Crutchfield

    on 3/31/2021

    Michael, That amp comes with harnesses that should make installation behind the dash straightforward and simple. The owner's manual has wiring diagrams to help.
  • Kevin Gabriel from Kapolei

    Posted on 6/24/2020

    Im assuming the install is exactly the same with an Alpine KTA-450 amplifier? It will be mounted to an Alpine ILX-w650. If I have aftermarket door speakers, is it still plug and play?

    Commenter image

    Buck Pomerantz from Crutchfield

    on 6/25/2020

    Kevin, The KTA-450 comes with a mounting bracket to attach it to the back of that receiver. And it comes with a harness that plugs into it. But, as in all installations, some additional wiring is required.
  • Evan Tuttle from Moore, Ok

    Posted on 4/9/2020

    Ok my original car radio doesn't connect to a 15a fuse in the fuse block. So I have to connect the KTP-445A directly to the battery. Do I connect the neg side to the OEM adapter and the yellow (batt) side to the battery or do I have to use a different ground for the KTP-445A amp. And connect the yellow to battery.

    Commenter image

    Buck Pomerantz from Crutchfield

    on 4/9/2020

    Evan, The Alpine KTP-445A was designed to work with Alpine receivers and features plug and play connections for that. There's no need for dedicated wire runs to the battery. Perhaps you're thinking about the KTP-445U which does.
  • Ken from Elmhurst

    Posted on 1/2/2019

    I had a KTP-445U installed in my 2018 Camry SE with standard factory audio system (non-JBL). I'm now having a Bluetooth Audio Echo problem where the caller hears their own voice echoing back to them when calling my phone which is connected via Bluetooth to my car. Do you have any suggestions as to what might not be installed or adjusted properly that would cause this problem?

    Commenter image

    Buck Pomerantz from Crutchfield

    on 1/7/2019

    Ken, I'm not sure, but it sounds to me that the Bluetooth microphone was installed too near the speakers, hence the echo on the caller's side. If you bought your amp from Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.
  • Steve Swenson from Chaska, MN

    Posted on 8/4/2018

    Hi, I want to install component speakers instead of factory in the front door and by the windshield i have a 1997 camry and the speakers are Jl audio C3-650s. The wiring is good for those speakers?

  • Commenter image

    Buck Pomerantz from Crutchfield

    Posted on 12/11/2017

    Chris, The Alpine KTP-445/A comes with wiring harnesses that have plugs on each end - there aren't supposed to be any loose wires. Maybe you're asking about a different amp's wiring harness. If you bought your amp from Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.

  • Chris from Riverside ca

    Posted on 12/9/2017

    What is the yellow wire with the blue stripe? All other wires match, and that one is left!?!?

  • Commenter image

    Buck Pomerantz from Crutchfield

    Posted on 10/9/2017

    Joseph, The Alpine KTP-45U has speaker-level inputs, so there's no need for an external line output converter.

  • Joseph Lanzi from Freehold

    Posted on 10/8/2017

    When installing with my original head unit do I still need to add a Line output converter or is it already built in to my alpine ktp445u

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