Pioneer TS-300D4 12" 30cm Champion Series Dual Voice Coil Car Subwoofer 1400W 884938373654 | eBay
TS-W310D4 - 12" Champion Series Subwoofer with Dual 4 Ω Voice Coils | Pioneer Electronics USA
Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer
PIONEER PREMIER TS-W1007D4 CHAMPION SERIES SUBWOOFER *OLD SCHOOL* 12562848990 | eBay
PIONEER TS-W311S4 CHAMPION SERIES 12" 4-OHM SUBWOOFER 1,400 WATT (400 W RMS) NEW 842372101424 | eBay
Amazon.com: Pioneer TS-A300D4 12 Inch 1500 Watts Max Power Dual 4-Ohm Voice Coil A Series Car Audio Stereo Subwoofer Loudspeakers / Free Alphasonik Earbuds : Electronics
Pioneer TS-W308D4 Champion Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Pioneer TS-W312D4 12" 12 inch Dual Voice Coil 4 ohm Car Component Subwoofer 884938476409 | eBay
Amazon.com: Pioneer TS-A301S4 Champion Series 12" 1600 W Max Power, Single 4 Ohm Voice Coil - Component Subwoofer : Electronics