Amazon.com: Pioneer TS-A301S4 Champion Series 12" 1600 W Max Power, Single 4 Ohm Voice Coil - Component Subwoofer : Electronics
1x Pioneer TS-300D4 12 inch 1400 Watts 4-Ohm Dual Voice Coil Car Audio Subwoofer 637740964585 | eBay
Pioneer TS-D10D4 D-Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
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Pioneer 12" 1400 W Max Power, Single 4-ohm Voice Coil, IMPP™ cone, Rubber Surround Component Subwoofer BLUE TS-A123R - Best Buy
Pioneer TS-A300B Single 12 inch Slot Ported / Vented Pre-Loaded Enclosure Subwoofer - (Dual 4 ohm voice coil)
Pioneer 12" 1400 W Max Power, Single 4-ohm Voice Coil, IMPP™ cone, Rubber Surround Component Subwoofer BLUE TS-A123R - Best Buy