Amazon.com: NVX VSW82v2 8" 500 Watt (250W RMS) Dual 2-ohm Space Saver VS-Series Car Subwoofer (VSW 82 Version 2) : Electronics
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
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