25cm 10 Inch 300w Subwoofer SQL 2x2 Ohms Car HIFI Bass CDT Audio Qes-1000 for sale online | eBay
MB Quart QSE-216 Q Series 6-1/2" 2-way component speaker system at Crutchfield
STLF-1504-4 | 15" 450W Raw Replacement Woofer w/ 4" Voice Coil for Subwoofers – Sound Town
BOSS Audio Systems D12F Phantom Series 12 Inch Car Audio Subwoofer - 1000 Watts Max, Single 4 Ohm Voice Coil, Sold Individually, Low Profile, For Truck Boxes and Enclosures, Hook Up To Amplifier