Mono - 1 Channel Harmony Audio HA-A400.1 Car Stereo Class D Amp Mono 800 Watt Subwoofer... $104.95 (6) Harmony Audio HA-A800.1 Car Stereo Class D Amp Mono 1600 Watt Subwoofer... $149.95 (3) Harmony Audio HA-A1500.1 Car Stereo Class D Amp Mono 3000 Watt Subwoofer... $239.95 (9) (2) Harmony Audio HA-A1500.1 Car Stereo Class D Amp Mono 3000 Watt Subwoofer... $460.99 Harmony Audio HA-A400.1 Car Stereo Class D Amp Mono Subwoofer Amplifier... $139.99 Harmony Audio HA-A1500.1 Car Stereo Class D Amp Mono Subwoofer Amplifier... $274.99 Alpine R2-W12D4 Next Gen 12" Sub R-Series Dual 4-Ohm 750 RMS Includes... $379.95 Alpine R2-W12D2 Next Gen 12" Sub R-Series Dual 2-Ohm 750 RMS Includes... $379.95 Harmony Audio HA-A800.1 Car Stereo Class D Amp Mono Subwoofer Amplifier... $209.99 Alpine R2-W8D2 Next Gen 8" Sub R-Series Dual 2-Ohm 350 RMS Includes HA-A400.1... $249.95 Kicker 44L7S154 Car Audio Solo-Baric 15 Subwoofer Square L7 Dual 4 Ohm... $449.99 Kicker 44L7S122 Car Audio Solo-Baric 12 Subwoofer Square L7 Dual 2 Ohm... $349.99 Kicker 44L7S124 Car Audio Solo-Baric 12 Subwoofer Square L7 Dual 4 Ohm... $340.99 Alpine R2-W10D4 Next Gen 10" Sub R-Series Dual 4-Ohm 750 RMS Includes... $329.95 Alpine R2-W8D4 Next Gen 8" Sub R-Series Dual 4-Ohm 350 RMS Includes HA-A400.1... $249.95 (2) Harmony Audio HA-A400.1 Car Stereo Class D Amp Mono 800 Watt Subwoofer... $209.99 (2) Harmony Audio HA-A800.1 Car Stereo Class D Amp Mono 1600 Watt Subwoofer... $320.99 Kicker 44L7S82 Car Audio Solo-Baric 8" Subwoofer Square L7 Dual 2 Ohm... $199.99 Alpine R2-W10D2 Next Gen 10" Sub R-Series Dual 2-Ohm 750 RMS Includes... $329.95 Kicker 44L7S104 Car Audio Solo-Baric 10" Subwoofer Square L7 Dual 4 Ohm... $274.99 Kicker 44L7S152 Car Audio Solo-Baric 15 Subwoofer Square L7 Dual 2 Ohm... $449.99 Alpine R2-W10D4 10" Subwoofer R-Series Dual 4 Ohm 750 RMS Includes HA-A400.1... $332.99 Kicker 44L7S102 Car Audio Solo-Baric 10" Subwoofer Square L7 Dual 2 Ohm... $279.99