Amazon.com: OSD 12" Powered Subwoofer 300W Front Firing, Home Theater Ready, Black Matte : Electronics
DS18 8" Shallow Subwoofer 300 Watt Max 4 Ohm Car Audio SRW Series SRW8 – Pricedrightsales
SVS 12" 300 Watt Subwoofer | Nebraska Furniture Mart
Amazon.com: 10 Inch Car Subwoofer Speaker - 300 Watt High Powered Car Audio Sound Component Speaker System w/ 1.5 Inch Kapton Bobbin Voice Coil, 8 Ohm, 25 oz Magnet, Cloth Edge Suspension - Pyramid WH10