Epique E150HE-44 5-1/2" DVC MMAG Extended Range Subwoofer 4 Ohm per Coil
Pyle PLPW6D 6In 600W Dual 4 Ohm Car Audio Stereo Speaker Subwoofer, Black - Walmart.com
Amazon.com: H YANKA 12 Inch Subwoofer - 12 Inch Paper Cone Subwoofer Car Audio, Black Steel Basket, Dual Voice Coil 4 Ohm Impedance 12 subwoofer, 1600W MAX Power 12 inch Competition Subwoofer : Electronics
Sony XSW122ES Mobile ES 2 Ohm Subwoofer
Dayton Audio PSS545HE-4 Vortex 21" Professional Subwoofer with 5" Voice Coil 4 Ohm
How To Wire A Dual Voice Coil Speaker + Subwoofer Wiring Diagrams
How to Wire a Dual 2 ohm Subwoofer to a 1 ohm Final Impedance | Parallel Wiring | Car Audio 101 - YouTube