4-channel class A/B amplifier Variably switchable HP and LP filters 0.2 Volt - 8 Volt input sensitivity RCA high level input with automatic "Turn On" 4x 50 Watt RMS at 4 Ohms 4x 90 Watt RMS at 2Ohm And 2x 180 Watt RMS mono up to 4 Ohm. Dimensions: 280 x 51 x 176m