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 Amplifiers X302-4X-Series, Class D 4-Channel Power AmplifierX802-5X-Series, Class D 5-Channel Power AmplifierKAC-M1814Compact 4-Channel Digital Amplifier