BOSS Audio Systems PD5000 Phantom Series Car Audio Amplifier - 3000 High Output, Class D, Monoblock, 1 Ohm, High/Low Level Inputs, High/Low Pass Crossover, Full Range, Hook Up To Stereo and Subwoofer -
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Taramps TS400X4 Full Range 2 Ohm 4 Channel 400W Class D Car Audio Amplifier : Electronics - Amazon.com