Amazon.com: H YANKA 12 Inch Subwoofer - 12 Inch Paper Cone Subwoofer Car Audio, Black Aluminum Basket, Dual Voice Coil 4 Ohm Impedance 12 subwoofer, 1600W MAX Power 12 inch Competition Subwoofer : Electronics
Boss Chaos Exxtreme 12" 1200w Dual Voice Coil 4 Ohm Car Audio Subwoofer (2 Pack) : Target
Audiopipe TSCVR10 TSCVR Series 10 inch Subwoofer - Dual 4 ohm voice coils
Dual Voice Coil (DVC) Wiring Tutorial – JL Audio Help Center - Search Articles
Boss Audio Systems P129dc Phantom 12 Inch 2600 Watts 4 Ohm Aluminum Dual Voice Coil Car Audio Stereo Subwoofer Speaker With Polypropylene & Paper Cone : Target
Pioneer TS-D10D2 10" Dual 2 ohms Voice Coil Car Subwoofer