West Coast Customs WCC2200.5 2200-Watt High Efficiency Multi-Channel Amplifier (Discontinued by Manufacturer) 3 Sets of RCA inputs. Level: Variable sensitivity from 0.2V to 6V. Bass Boost: Adjustable 45Hz bass boost from 0dB to 10dB. Minimum final loudspeaker impedance's: 2 Ohms per channel for channels 1-4, 1 Ohm on channel 5. 5 Channel: 4 Ohms (150 X 4 + 500), 2 Ohms (300 X 4 + 1000)