Amazon.com: Car Vehicle Subwoofer Audio Speaker - 12 Inch 1200 Watt Power Ultra Slim DVC Subwoofer w/ Dual 2.5” Kapton Voice Coil, 4 Ohm Impedance, 75 Oz Magnet - for Vehicle Stereo Sound System - Pyle PLWCH12D : Electronics
Car Vehicle Subwoofer Audio Speaker - 12 Inch Blue Injection Molded Cone, Blue Chrome-Plated Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 1200W Power For Vehicle Stereo Sound System - Pyle PLBW124
XL-1244D 12" Subwoofer
12" Sub Subwoofer Bass Car Audio 5500W 4 Ohm Dual Voice Coil Bass SQL car Audio | eBay
Helix Blue B12WDVC4 12" subwoofer with dual 4-ohm voice coils at Crutchfield