Clifford X 150.4 4CH Class AB Power AmplifierDual Variable low pass Filter (40Hz-10KHZ)Dual Variable High pass Filter(20Hz-10KHZ)FULL RANGE (5Hz-85KHz) with BASS BOOST (0-6-12dB)Double transformer, with wired remote control.Heavy heatsink better for heat radiationFuse Protection:40AX3Heavy..