Give your car stereo system a power boost with this Alpine Power Pack KTP-445U 180W Class D bridgeable 4-channel amplifier that features a 12dB/Oct high-pass filter for powerful sound.
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Installed this amp in my new pickup truck recently and it boosted the sound astronomically. Previously I had to turn the radio volume up about 3/4 of the way to be able to hear it with my windows down just half way. Now, I barely have it 1/4 of the way up and the windows down all the way and the sound is loud and clear. Highly recommend to boost the quality of a factory installed radio system.