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  Alpine KTP-445U Head Unit Power Pack 45W x 4 Car A
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Compact upgrade for any car radio — 45 watts RMS X 4

157 people say
Our Price: CAD $239.99

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Product Code: 500KTP445U

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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.

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.

Installation Note: We recommend running a dedicated constant power wire to the battery for optimal performance from this Alpine amp — we offer an inexpensive wiring kit for this installation. This high-powered amp won't work in systems where an outboard factory amplifier is still active.

Product Highlights:
   » compact Class D amplifier for factory and aftermarket receivers
   » universal plug lets you send signal from RCA outputs or speaker-level wiring
   » 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

157 people say

Plus-Up September-01-16
Reviewer: Brian from Dedham, MA  
I bought this amp to plus-up my stock stereo system in my 2012 Subaru Impreza. The sound was better after the installation, but the factory speakers were not good enough to handle the power.

Does the job! August-25-16
Reviewer: Douglas from Raleigh, NC  
This amp is part of a complete audio system I put in my 2001 Jeep Cherokee XJ. I'm using it to bump up the power to four Polk Audio db651s speakers mounted in the stock locations. I set the cutoff at 60 and am running a RF Punch P300-10 for the bass. It has its own built-in amp. The Polk Audio speakers sound great so the amp must be doing something right. It's mounted behind the Kenwood Excelon KDC-X300 in the dash. Out of sight, out of mind.

Great little amp! July-24-16
Reviewer: TerryM from Luray, VA  
This little amp packs quite a punch when you're short on mounting space. Going from stock head unit to an aftermarket always ends up sounding flat and tinny. I had purchased a larger amp to address this, however my plans to mount it under a seat ultimately turned me off.

I bought this unit and installation was quite simple. No running wires from the engine bay and running a ground wire to somewhere on the floor. Just need RCA cables, radio wiring kit, and crimps. 90% of the installation prep was done before opening the car door.

The size of this amp is great! It fits right behind my head unit with room to spare. I definitely recommend!

AMAZING July-17-16
Reviewer: CP from Blackwood, NJ  
This little alpine amp is Amazing! For the money and the convenience there is nothing out there that can compete. My piece of advice is use this amp bridged at 90 watts rms x 2. Using the 45 x 4 is ok for increasing clarity but will only give you a small power boost over your head unit.  At 90x4 this amp comes alive and can compete with some bigger wired amps in power and clarity. I definitely recommend this amp for a small component set and it will bring it to life.

It has its pros in cons in my opinion. May-13-16
Reviewer: audiophile from Grand Rapids, MI  
This is definitely an improvement to a stock head unit. It sure does pack a punch after tapping into the stock head unit power and ground, as described in the manual. Some maybe skeptical that splicing into the head unit power will be sufficient for an amplifier but I think it supplies plenty of power.

I replaced the stock speakers with JL audio C2 series and had the gain on this amplifier at nearly 20-25% and it was quite loud.

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Alpine KTP-445U Power Pack CAD $239.99