Wiring Two Subwoofers DVC 4 Ohm - 1 Ohm Parallel vs 4 Ohm Series Wiring - YouTube
Crunch Crw12d4 12 Inch 800 Watt Max 4 Ohm Dual Voice Coil Car Subwoofer Speaker With 2 Channel 1000 Watt Amp A/b Class Car Audio Stereo Amplifier : Target
2-Ohm vs 4-Ohm Subwoofers: What's the Difference? - Sonic Electronix Learning Center and Blog
MTX Audio TERMINATOR6S 6.5" 2-Way Car Component Speaker System, 45 W R – Car Toys