Pioneer TS-W309S4 Champion Series 12" 4-ohm subwoofer at Crutchfield
TS-W311D4 - 12" Champion Series Subwoofer with Dual 4 Ohm Voice Coil | Pioneer Electronics USA
Pioneer 12" 1600 W Max Dual VC 4 Ohm Subwoofer - TSA301D4 | Reverb
Amazon.com: PIONEER CAR TSA301D4 12-inch 1600 W Max Power, Dual 4 Ohm Voice Coil for for Powerful Bass Champion Series - Component Subwoofer : Electronics
PIONEER TS-W311S4 CHAMPION SERIES 12" 4-OHM SUBWOOFER 1,400 WATT (400 W RMS) NEW | 702MOTORINGLASVEGAS