Pioneer GM-DX975 Class D 5 Channel Amplifier 2000 Watts MAX 5 Channel Class D Amplifier 2000 Watts MAX Power Variable HPF/LPF Bass Boost Remote Aluminum Top Plate Gold RCA Terminal Hi-Res Capable HQ Sound Parts Class D Mosfet Load Impedance 2-8 Ohm Wattage RMS (4 Ohm) 75w x4 Wattage RMS (2 OHm) 100w x4 Frequency Response 10Hz-50kHz Wattage RMS (4 Ohm) 350W Wattage RMS (2 Ohm) 600W Frequency Response: 10Hz to 500kHz