12" Subwoofer 5500W 4Ohm Dual Voice Coil SPL EXTREME HIGH POWER CAR SUBWOOFER!!! | eBay
car subwoofer by massive audio hippoxl84 spl extreme bass woofer 8 inch car audio 1,000 watt hippoxl series competition subwoofer, dual 4 ohm, 2.5 inch voice coil. sold individually - Newegg.com
Ground Zero - Ground Zero GZIW 10SPL 10″ high quality SPL subwoofer| Maverick's Custom Motorsports