PIONEER TS-W3003D4 12" 2000W MAX CHAMPION PRO DUAL 4 OHMS SUBWOOFER CAR SUB 884938234610 | eBay
Amazon.com: PIONEER TS-D12D2 D Series 12" 2000 W Max Power, Dual 2 Ohm Voice Coil, Aramid Fiber IMPP Cone, Rubber Surround - Component Subwoofer, Black : Electronics
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-A3000LS4 Shallow-mount 12" 4-ohm subwoofer at Crutchfield