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
Kenwood Car Audio KFC-PS3017W PS-Series 30cm 12" 2000w Single VC 4Ohm Subwoofer
KICKER CVTDF 12" (30cm) Subwoofer in Down Firing Encl, 2-Ohm; RoHS Compliant