Best Buy: Pioneer Champion Series 12" Dual-Voice-Coil 8-Ohm Subwoofer Black TSW310D4
Pioneer Pro Series 12" 1,500-watt Subwoofer in the Mobile Audio department at Lowes.com
Pioneer 2009 Car Audio Catalogue by Car Audio - Issuu
2) Pioneer Free Air Series Speakers TS-W25F Subwoofer | TRS Consignment Auction: Great deals on Automotive parts and accessories, Vinyl Machine Business set up, Griddle and more! | Equip-Bid
TS-SW2501S2|S4 - 10" Shallow-Mount Subwoofer with 1200 Watts Max. Power | Pioneer Electronics USA
Pioneer TS-W303F 12" Free-air Subwoofer at Crutchfield
Pioneer TS-1200M 12" - 1400 W Max Power, Single 4Ω Voice Coil, IMPP™ cone, Rubber Surround | Component Subwoofer - Walmart.com