KAC-9152D High Quality Monaural Power Amplifier for Subwoofer Class D AmplifierLow-pass FilterBass Boost CircuitInfrasonic filterLine outSpeaker level Input Key Features D-class Amplifier Circuit 1Ω Load Capability Dual Mono Drive (Two Amp Bridged Connection, 2-4ohms) 500W @ 4ohm 900W @ 1ohm