KAC-9103D Class D Mono Channel Power Amplifier Class D AmplifierCEA-2006 CompliantLow-pass FilterBass Boost CircuitInfrasonic filterCooling FanLine outSpeaker level Input Key Features D-class Amplifier Circuit 1Ω Load Capability Built-in Low-pass & Infrasonic Filter 1800 Watts max Output Power Cooling Fan