Filter Filters Class D 1 Ohm Remove All Filters Price $100-$500 (2) Condition New (2) Brand Harmony Audio (2) Channels 1 (2) Harmony Audio HA-A800.1 Car Stereo Class D Amp Mono 1600 Watt Subwoofer... $149.95 (3) Harmony Audio HA-A400.1 Car Stereo Class D Amp Mono 800 Watt Subwoofer... $104.95 (6)