Alpine KTP-445A Power Pack Review – Save Space, Get Power!

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The Alpine KTP-445A Power Pack amplifies power output on select 2005 and newer Alpine head units, resulting in what the company says is an up to 150-percent power increase over the original power output from the head unit’s built-in amp.


  • Compact upgrade amplifier for Alpine in-dash receivers
  • 45 watts RMS x 4 at two (2) to four (4)-ohms
  • Plenty of power to drive high-performance speakers or keep up with a subwoofer amp


  • Brings total power output up to 45 watts x 4 – including power already supplied by head unit
  • Some users have reported sound quality not quite up to satisfaction


The KTP-445A employs a 45 watt to 4-channel amplifier that brings with it a low noise floor, clean signal path and no extraneous interference.

The end result, according to bench tests, is a one (1)-watt signal-to-noise ratio of 82dB or better; what’s more, the amp distortion actually decreases at higher frequencies, resulting in a clean, clear signal where the ear is most sensitive to such distortion.

Alpine’s inventive Power Pack connects to any 2005 and newer Alpine head unit that boasts a black 16-pin wiring harness. We here at advise you to check with us or another mobile audio professional to confirm compatibility with your particular radio.

The Power Pack comes with a 15A fuse installed, 39-inch amp-to-receiver harness, 31-inch amp-to-vehicle harness, two brackets, four screws, four wire ties, installation diagram, online product registration and limited warranty information.

Features & Specifications

  • Max Power Output: 90 watts x 4
  • RMS Power Output: 45 watts x 4
  • Amp Class: D
  • Bridgeable: N/A
  • Dimensions: 7 7/8-inches (W) x 1 ½-inches (H) x 2 9/16-inches (D)


We have given Alpine products plenty of accolades in the past, and rightfully so – after all, the brand is synonymous with high-quality mobile audio performance, and has been for generations.

Since branching out beyond the products Alpine has been traditionally recognized for (namely competition-grade head units), the company has become a go-to choice for everything from in-dash equalizers to power amplifiers, component speakers, subwoofers, crossovers and more, catering to the needs of every casual and diehard mobile audio enthusiast alike.

The 445A Power Pack is just the latest example of the markets Alpine has tapped into and provided unique products for, offering a solution to those who don’t wish to change their in-dash receiver just to attain a bit more power for their door and deck speakers.

Easy to install, this car amplifier will wake up your speakers without the complications of a large project, coming with everything you need to get the party started…no additional power wiring required.

Simply plug the amp harness between the head unit and its original plug, mount the Power Pack below your glove box or other convenient location, and you’re off.

Last update on 2024-05-18 / Affiliate links / *Image Disclaimer: We use images/data from Amazon Product Advertising API solely on products that link to Amazon. On products with the "Price at Crutchfield" button, we use images/data from as per the partnership deal.

Hey, there mobile audio lovers! My name is Vincent Talbot, founder and chief editor at Ask any mobile audio fanatic, installer, or company rep what makes a good car speaker, sub, or amp, or, better yet, why he or she prefers a certain brand over another, and be prepared to endure a litany of opinions, viewpoints, and passion-fueled perspectives. To be honest, mobile audio shopping can be a daunting task without a guide, so I’ve assembled what I feel are the best products to consider to make things easier for you. More.

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