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 Premier TS-W1208D2 Champion Series 12" subwoofer with dual 2-ohm voice coils at Crutchfield
Pioneer TS-W3002D2 (TSW3002D2) 12" Dual 2 ohm Champion PRO Sub