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Amazon.com: Gravity 1x 8 Inch 1000 Watt Car Audio Subwoofer w/ 4 Ohm DVC Power 8' Sub Single - Feature Dual Voice Coil, Thick Magnet, Design for Car, ATV, Van, High Performance
Massive Audio GTX 84 800 Watt 8" Inch Dual 4 Ohm Car Audio Sub Subwoofer | eBay
Massive Audio GTX Series 8-Inch 400-Watt-RMS Dual 4-Ohm Subwoofer in the Mobile Audio department at Lowes.com