Dayton Audio MX15-22 15" Max-X High Excursion DVC Subwoofer 2 Ohms Per Coil
Subwoofers – Pride Car Audio
Ground Zero GZHW 38SPL - 15" Inch 38cm Dual 1-Ohm SPL Car Subwoofer | eBay
Amazon.com: Pyle 6.5 Inch Mid Bass Woofer Sound Speaker System - Pro Loud Range Audio 300 Watt Peak Power w/ 4 Ohm Impedance and 60-20KHz Frequency Response for Car Component Stereo PLG64,Yellow : Electronics