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
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Kenwood Excelon KFC-XW1241 12" 4-ohm Component CAR Subwoofer 2000W SUB KFCXW1241 884938234610 | eBay
KENWOOD KFC-W3041 12-Inch 2,000-Watt Max Subwoofer in the Mobile Audio department at Lowes.com
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