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Audiopipe TSCVR12 TSCVR Series 12 inch Subwoofer - Dual 4 ohm voice coils
Rockford Fosgate P3D4-15 Punch P3 15" subwoofer with dual 4-ohm voice coils - Breakers Stereo and Performance
JL Audio 12W6V3-D4 at Onlinecarstereo.com
Subwoofer wiring diagrams
55 Series 12" 4Ω Dual Voice Coil Subwoofer | MTX Audio - Serious About Sound®
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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
What are dual voice coil subwoofers?
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How To Wire A Dual Voice Coil Speaker + Subwoofer Wiring Diagrams
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