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  Alpine KTP-445U Head Unit Power Pack 45W x 4 Car A
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Upgrade any car radio to 45 watts RMS X 4

107 people say
List Price: CAD $199.99

In Stock
Product Code: 500KTP445U

Overview Details Accessories
Alpine Authorized Online Dealer

More power, less hassle

Want a simple way to crank up the power of your receiver? Alpine's "Power Pack" amplifier increases your receiver's power output to 45 watts RMS by 4 channels. That's a big jump up from the 7-20 watts per channel typically put out by a car radio, and plenty of power to drive high-performance speakers or keep up with a big subwoofer amplifier. Best of all, this compact amplifier is so efficient you can often run it off the same circuit that powers your receiver. A universal plug lets you feed a signal via RCA outputs or speaker-level wiring.

The KTP-445U will work with just about any car stereo, but it's not a plug-and-play installation — you'll have to wire it into your system. If your car receiver's power circuit is protected by a 15-amp or larger fuse (check your fuse box or owner's manual), you can tap into it to power your KTP-445U. Otherwise, you'll have to run a power wire to the battery. Be sure to add a 15-amp inline fuse as close to the battery as possible.

You can install this compact amp behind most dashboards, but you'll need 4-channel patch cables to connect your car stereo to the amp's preamp inputs. You can also splice into your speaker wiring to get signal to the KTP-445U.

Important Note: The KTP-445U Power Pack won't work in a system with an active factory amplifier. You'll have to bypass the factory amp if you want to upgrade your power with the KTP-445U, and we don't recommend using this Alpine amp to replace a factory amp with more than 4 channels. Please contact an Advisor at 1-800-297-9469 to check compatibility if you have any questions.

   » compact Class D amplifier for factory and aftermarket receivers
   » universal plug lets you send signal from RCA outputs or speaker-level wiring
   » runs off same power circuit as receiver (must be 15-amp or more)
   » 4-channel amplifier
   » 45 watts RMS x 4 at 4 ohms (CEA-2006 compliant)
   » built-in high-pass crossover (selectable 60, 80, 120 Hz at 12 dB/octave)
   » selectable gain switch (high/low) and switchable 2- or 4-channel operation
   » fuse: 15A
   » dimensions: 7-7/8"W x 1-1/2"H x 2-9/16"D
   » warranty: 1 year

Alpine KTP-445U Power Pack Reviews

107 people say

love it, exactly what I needed, but READ MY CONs November-10-14
Reviewer: tom from Denver, CO  
Great little amp, not too difficult to install, makes a noticeable improvement in the sound quality of my aftermarket speakers.  Read my comment in the Cons. I would actually give this amp 5 stars, but I want to draw attention to this error.

Just what my Harley needed October-03-14
Reviewer: John from Chesterfield, VA  
I put a Kenwood KMR D558BT on my 2011 Harley Street Glide along with Hogtunes 5.25" fairing speakers and Polk Audio DB691 6X9 speakers in the saddlebag lids.  I was hoping that the 22W RMS power the Kenwood pushed would be enough to push this setup since I'm not looking for thunderous bass just good clear sound at highway speeds.  Well that setup sounded great in my garage but once on the highway I had to pump it up all the way past 30 of 35 on the volume and it sounded very shallow and a little distorted.  I saw this amp at the store and I loved the small size for an easy add on under my fairing were space is limited.  Setup was easy if you can follow directions.  After installation...WOW WHAT A DIFFERENCE!.  It really gives the system depth and clarity.  At highway speeds it sounds awesome.  Now at 30 of 35 volume I can't hear myself scream.  I have the gain set at about 11 o'clock so it doesn't clip.   You can hear all the notes so clearly.  I couldn't be happier.  It's doesn't have super bass but that is because I don't have a sub.  This is for someone that just wants good, clear, deep sound.  Don't knock it because it doesn't do what a larger amp does, it's not supposed to.  Get the right size amp for the job you need it to do.

Great factory amp upgrade September-22-14
Reviewer: schambo from Bergen County, NJ  
If you want to keep your factory head unit this is the answer. Doubles the power output and is simple to install. I have been using it for over 8 months with Infinity Reference components and it sounds even better as time goes by. For me it is almost too much volume. It's not going to blow your doors off but will satisfy your needs.

Big bang in tiny package September-17-14
Reviewer: phaelax from ohio  
My application was a little different than the average user as the car was a '73 Duster.   I did not want to cut into the factory dash to fit an aftermarket radio nor have one hang from under the dash like you commonly see in old cars.  This tiny amp easily fits behind the dash.  I made a custom harness to use an 1/8" audio jack for the input source which I fit into a pre-existing hole where an old radio knob used to be.  Using my iphone for music instead of a head unit, this little amp is enough to power the rear 6x9s loud enough (and without distortion) to actually hear the music over the thundering rumble of the 440 block, which is nice on longer highway trips.  

Only thing I wish it had was an external line to control the volume rather than the dials on the amp itself. I'd rather be able to adjust the volume from a knob than on my phone.

Super power pack September-12-14
Reviewer: Bob L from Cranston, RI  
Unbelievable compliment to any stereo. I put this in my Harley Road Glide. Had Kenwood stereo with Kicker speakers installed without it at first and when riding I had to crank the stereo. after about 15 minutes, the speakers started to cut out. I thought I had inferior speakers. After talking to awesome tech support, they told me to buy this amp. the radio could not handle being maxed out that long. Once installed, which was super easy, I was blown away with the results. I would not install another radio without this must needed add on. Again, cudos for tech support

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Alpine KTP-445U Power Pack CAD $199.99