Amazon.com: American Bass ES-1044 10-inch Subwoofer, 500 Watts RMS/1000 Watts Max Power, 4 Ohm Impedence, Dual 4 Ohm Voice Coils with PVC Gasket Ring and Rubber Surround : Musical Instruments
American Bass XD-12 12" Car Subwoofer 500 Watts DVC 4-Ohm
Amazon.com: American Bass XD-1244 12-inch Subwoofer 500 Watt RMS / 1000 Watt Max Dual Voice Coil 4 Ohm Voice Coils 125 Oz Magnet : Musical Instruments
AudioControl Spike Series 12" High-Performance Subwoofer
Amazon.com: American Bass DX-15 4 Ohm, 500 Watt RMS / 1000 Watt Max Power, 15 Inch Subwoofer, 125 oz Magnet, Single, Hi-Temp 4-Layer Voice Coil, Black Powder Coated,Non-Pressed Paper Cone : Electronics