Filter Filters Single 12" Remove All Filters Price $50-$100 (2) $100-$500 (1) Condition New (3) Brand Harmony Audio (3) Sensitivity 87.3 dB (1) 87.3dB (1) 88.2dB (1) Harmony Audio HA-F124 Car Stereo Flatline Series 12" Sub 800W Single 4 Ohm... $99.95 Harmony Audio HA-F124 Car Stereo Flatline Series 12" Sub 800W Single 4 Ohm... $189.99 Harmony Audio HA-R124 Car Stereo Rhythm Series 12" Sub 600W Single 4 Ohm... $67.95 (2)