Amazon.com: 2 X Pioneer TS-300D4 12 Inch 1400 Watts Max Power Dual 4-Ohm Voice Coil Car Audio Stereo Subwoofer Loudspeakers/Free Alphasonik Earbuds : Electronics
TS-W260S4 - Pioneer 10" 350W RMS Single 4-Ohm Champion Series Subwoofer
PIONEER CHAMPION SERIES TS-A301S4 1600 WATTS 12" SINGLE 4 OHM CAR SUBWOOFER SUB 884938496056 | eBay
Pioneer TS-A301S4 | 500W RMS 12" Champion Series Subwoofer
Pioneer TS-W308D4 Champion Series 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Pioneer TS-A301S4 at Onlinecarstereo.com
Pioneer TS-W309D4 12" Champion Series Subwoofer with Dual 4 Voice Coil | Facebook
PIONEER PREMIER TS-W1007D4 CHAMPION SERIES SUBWOOFER *OLD SCHOOL* 12562848990 | eBay
Amazon.com: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer : Electronics
Pioneer TS-W258D4 Champion Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
Pioneer TS-A301S4 | 500W RMS 12" Champion Series Subwoofer