Massive Audio GTX Series 12-Inch 700-Watt-RMS Dual 4-Ohm Subwoofer in the Mobile Audio department at Lowes.com
Massive Audio GTX Series 15-Inch 700-Watt-RMS Dual 4-Ohm Subwoofer in the Mobile Audio department at Lowes.com
Massive Audio 6" Subwoofer 500 Watt Dual 4 Ohm Voice Coil GTX64 — Big Jeff Online Inc
Massive Audio HIPPOXL 104 at Onlinecarstereo.com
Amazon.com: Massive Audio MMA124 MMA Series. 12 Inch, 1000 Watt, Dual 4 Ohm Car Subwoofer, 2.5 Inch Voice Coil. Sold Individually. : Electronics
Amazon.com: Massive Audio SUMMOXL124-12 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 12" Subwoofer 1500 Watt RMS, 3000w MAX Dual 4 Ohm, 3 Inch Voice Coil. Sold Individually : Electronics