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The KAC-9103D features an ultra efficient Class D design for maximum output, minimum heat, and reduced stress on your vehicle's electrical system. Plus, the MOSFET switching power supply ensures clean, consistent power. The aluminium die cast heat sink not only looks great, it helps the KAC-9103D keep its cool. Features a fully variable low-pass filter, switchable subsonic filter to help protect your subs, and gold-plated RCA inputs/outputs.