Filter Filters Class D Remove All Filters Price $100-$500 (4) Condition New (4) Brand Harmony Audio (4) Stable to (Ohm) 1 Ohm (3) 4 Ohm (1) Channels 1 (3) 4 (1) Harmony Audio HA-A400.1 Car Stereo Class D Amp Mono 800 Watt Subwoofer... $104.95 (6) Harmony Audio HA-A400.4 Car Stereo Alloy Amp 4 Channel 800W Full Range... $109.95 Harmony Audio HA-A1500.1 Car Stereo Class D Amp Mono 3000 Watt Subwoofer... $239.95 (9) Harmony Audio HA-A800.1 Car Stereo Class D Amp Mono 1600 Watt Subwoofer... $149.95 (3)