Filter Filters Harmony Audio Dual Remove All Filters Price $50-$100 (2) $100-$500 (16) Condition New (18) Size 15" (6) 12" (6) 10" (4) 18" (2) Sensitivity 83.1dB (2) 84 dB (1) 84dB (1) 85.7dB (2) 86.9dB (2) 87 dB (1) 87dB (1) 88.4dB (2) 88.6dB (2) 88.7dB (2) 89.4 dB (1) 89.4dB (1) Harmony Audio HA-ML182 Monolith 18" Competition Sub 3500W Dual 2 Ohm Subwoofer $379.95 (2) Harmony Audio HA-C124 Car Stereo Competition Carbon 12" Sub 2200W Dual 4 Ohm... $169.95 (4) Harmony Audio HA-ML122 Monolith 12" Competition Sub 3000W Dual 2 Ohm Subwoofer $309.95 (9) Harmony Audio HA-ML121 Monolith 12" Competition Sub 3000W Dual 1 Ohm Subwoofer $309.95 (1) Harmony Audio HA-A102 Car Stereo Alloy Series 10" Sub 800W Dual 2 Ohm Subwoofer $79.95 Harmony Audio HA-C102 Car Stereo Competition Carbon 10" Sub 2000W Dual 2 Ohm... $149.95 (1) Harmony Audio HA-ML152 Monolith 15" Competition Sub 3200W Dual 2 Ohm Subwoofer $339.95 (6) Harmony Audio HA-C122 Car Stereo Competition Carbon 12" Sub 2200W Dual 2 Ohm... $169.95 (3) Harmony Audio HA-C104 Car Stereo Competition Carbon 10" Sub 2000W Dual 4 Ohm... $149.95 (1) Harmony Audio HA-A152 Car Stereo Alloy Series 15" Sub 1500W Dual 2 Ohm Subwoofer $109.95 Harmony Audio HA-A122 Car Stereo Alloy Series 12" Sub 1000W Dual 2 Ohm Subwoofer $84.95 Harmony Audio HA-ML181 Monolith 18" Competition Sub 3500W Dual 1 Ohm Subwoofer $379.95 (1) Harmony Audio HA-A102 Car Stereo Alloy Series 10" Sub 800W Dual 2 Ohm... $189.99 Harmony Audio HA-C152 Car Stereo Competition Carbon 15" Sub 2800W Dual 2 Ohm... $189.95 (1) Harmony Audio HA-A152 Car Stereo Alloy Series 15" Sub 1500W Dual 2 Ohm... $209.99 Harmony Audio HA-ML151 Monolith 15" Competition Sub 3200W Dual 1 Ohm Subwoofer $339.95 Harmony Audio HA-A122 Car Stereo Alloy Series 12" Sub 1000W Dual 2 Ohm... $164.99 Harmony Audio HA-C154 Car Stereo Competition Carbon 15" Sub 2800W Dual 4 Ohm... $189.95 (1)