Amazon.com: Alphasonik NSW412 Neuron 400 Series 12” 1500 Watts Max / 500 Watts RMS Dual 4 Ohm Car Subwoofer w/ High Grade Magnet Non Pressed Paper Carbon Stitched Cone Cooling Rings System
PIONEER TS-W311S4 CHAMPION SERIES 12" 4-OHM SUBWOOFER 1,400 WATT (400 W RMS) NEW | eBay
Pioneer Champion Series 12" Dual-Voice-Coil 4-Ohm Subwoofer Black TSW311D4 - Best Buy