Pioneer Premier TS-W5102SPL SPL Champion Series 12" sub with dual 2-ohm voice coils at Crutchfield
TS-W3002D4 - 12" Champion Series PRO Subwoofer with 3500 Watts Max. (1000 Watts Nom.) | Pioneer of Canada - English
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-W3002D4 Champion Series 12" 3500W PRO DVC Subwoofer 4+4 Ohm