Pioneer TS-W259D4 Champion Series 10" subwoofer with dual 4-ohm voice coils at Crutchfield
PIONEER TSW312D4 12-INCH 1600 WATTS MAX DUAL 4-OHM VOICE COIL CAR SUBWOOFER -NEW | eBay
Amazon.com: PIONEER TS-WX1220AH Dual 12" Ported Enclosure Active Subwoofer with Built-in Amplifier, Black : Electronics
Pioneer TS-D10D2 - 10" - 1500w Max Power, Dual 2 Ohm Voice Coil, Armid Fiber IMPP cone, Rubber Surround - Subwoofer - Used Good - Creative Audio
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