12" Subwoofer 600W 2" 4 Ohm DVC Pro Car Audio American Bass XO-1244 - Walmart.com
Memphis Audio MJP1244 MOJO Pro Series 12" Component Subwoofer with Dual 4-ohm Voice Coils - Creative Audio
Amazon.com: AUDIOTEK 12 Inch Pro Car Audio Subwoofer 1500 Watt Max Power, RMS -750 Watts Dual 4 Ohms Voice Coil High Performance 12" Competition Sub Bass Elite Series AT-12PRO : Electronics