Amazon.com: Alpine SWR-8D4 8" Car Subwoofer : Electronics
BOSS Audio Systems CXX104DVC Chaos Extreme Series 10 Inch Car Audio Subwoofer - 1000 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, For Truck Boxes and Enclosures, Hook Up To Amplifier
Alpine Jeep Wrangler Single 12-Inch Alpine Halo R-Series Preloaded Subwoofer Enclosure with ProLink R2-SB12V (Universal; Some Adaptation May Be Required) - Free Shipping
2) Crunch CRW12D4 12" 800 Watt Car Audio Subwoofers+Vented Sub Box Enclosure - Rockville Audio