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How to install the Alpine KTP-445 Power Pack

Upgrade your car stereo with this compact, powerful amplifier

I've been with Crutchfield since 1999, where I began as one our advisors, helping our customers choose new gear. After a couple of years, I moved to the writing team where I spent a decade researching new products and getting hands on with car stereos, amplifiers, speakers, and subs. Yeah, I've been doing this for a while.

For the past few years, I've been the managing editor of Crutchfield's Car A/V web article content. I couldn't ask for a better job — we get to play with car audio gear every day! I'm a Virginia native from the heart of the Blue Ridge Mountains. Outside of work, I love listening to music, playing board games, and installing new audio systems for my friends.

More from Robert Ferency-Viars

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.

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.

  • alex herman from memphis

    Posted on 8/18/2016

    Quick question. if I use this with an aftermarket stereo, will using a stock wiring be fine?

  • Alexander Hrabe from Crutchfield

    Posted on 8/19/2016

    Alex, yes, you'll connect the Alpine harness to your factory wiring. However, you'll the aftermarket stereo will need to be an Alpine.

  • Brandon from Denver

    Posted on 9/2/2016

    Is the install this easy for all stock head units, or just for Alpine head units? Any wire cutting/splicing needed for a 2016 Tacoma Entune head unit?

  • Alexander Hrabe from Crutchfield

    Posted on 9/6/2016

    Brandon, this works with select Alpine stereos only. If you'd like to add a compact amp to your factory system, give us a call and an advisor will help you find the right one for your system.

  • Marvin Graham from Stanton

    Posted on 5/7/2017

    I'm confused I how it hooks into factory wiring. I like it plugs into back of my alpine head unit but how does it hook into the wiring on my 2006 Durango

  • Buck Pomerantz from Crutchfield

    Posted on 5/9/2017

    Marvin, You first unplug your Alpine radio from the vehicle harness. Then you plug one of the KTP-445's plugs into the receiver and the other into the vehicle harness plug. It's a lot simpler than it sounds.

  • Greg from Philadelphia

    Posted on 5/12/2017

    What if you are installing a new Alpine head unit and the amp at the same time. Will the vehicles original old harness need to be modified? Or is the amp made to accept it? Will factory speaker wire be able to handle the 90 watts per channel?

  • Buck Pomerantz from Crutchfield

    Posted on 5/13/2017

    Greg, When you purchase an aftermarket receiver, you also need to get a wiring harness that gets hard-wired to the new receiver's wiring harness and then plugs into your vehicle's wiring harness. The KTP-445A plugs up between the receiver's wiring harness and the receiver itself. Why don't you give us a call and an Advisor will make sure you get all the gear and accessories you need to successfully install your system. Your vehicle's wiring will handle the amp's 45 watts per channel output just fine.

  • Marc

    Posted on 8/16/2017

    Hi, can you connect this amp (KTP-445A) to a Pioneer headunit too? What kind of modifications need to be made in that case to the wiring? Thanx.

  • Buck Pomerantz from Crutchfield

    Posted on 8/16/2017

    Marc, The Alpine KTP-445A only works with Alpine receivers because of the brand-specific plugs and harnesses they use. Fortunately for you, Alpine makes a universal version of that amp, the KTP-445U Power Pack, which'll work with any aftermarket receiver.

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