Pioneer GM-D8704 Stereo Amp Compact 4 Channel Class FD Car Amplifier 600w RMSGM D8704 4 Channel Class FD Car Amp. Compact 4 Channel Power An amplifier shouldnt take up too much space, especially in your car. This Class D amps might just be what youre looking for. It combines a 1 Ohm stable circuit, installation flexibility and a superior high power output. Speaker line input sensorconnect your existing OEM unit without the hassle of add on adapters Variable LPF Variable LPFadjust your low pass filter frequency for greater