RW8D2 Echo Series 8 Inch 400 Watts Power Dual 2 Ohm Voice Coil, 2" Black-Coated 4 Layer High Temperature Voice Coil, Competition Grade Pressed Paper Cone, Car Audio Subwoofer - Recoil Audio
Goldwood Shielded Dual Voice Coil 6.5 in. Woofer 90-Watt 8 ohm Sub Speaker GW-406D - The Home Depot
Focal SUB 10 DUAL 10" Subwoofer, Dual 4-Ohm Voice Coil, 250W RMS - 500 W MAX - Creative Audio
GRAND TOURING GTO 1514D | 15 inch Dual Voice Coil Subwoofer
KICKER CompR 10" Dual-Voice-Coil 2-Ohm Subwoofer Black 43CWR102 - Best Buy