Details 100W x 4 max @ 4 OHM I 50W x 4 RMS @ 4 OHM I 75W x 4 @ 2 OHM Ultra-Compact Class D Design is only 3.6" W x 5.5" long x 1.5" tall so it can fit behind the dash. Front and Rear Hi-Pass Crossovers are switchable between off I 80Hz I 120Hz with 12dB/octave slope. RCA Inputs connect the amp to an aftermarket stereo's RCA outputs. High level Inputs connect the amp to the speaker wires of any non-amplified factory stereo. Front and Rear Variable Gain Controls so you can tune the amps input to your car stereos voltage output. No amp install kit required, the prewired harnesses have all connections needed.