KICKER CompR 10" Dual-Voice-Coil 2-Ohm Subwoofer Black 43CWR102 - Best Buy
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KICKER CompR Dual 12" Dual-Voice-Coil 2-Ohm Subwoofers with Enclosure Black 43DCWR122 - Best Buy
Amazon.com: DS18 PSW12.2D 12" Shallow Mount Subwoofer 1200 Watts Max Power 600 Watts RMS Dual Voice Coil 2+2 OHMS Water Resistant - Best Sub for Tight Spaces in Car & Trucks - 1 Speaker : Electronics
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How To Wire A Dual Voice Coil Speaker + Subwoofer Wiring Diagrams