DD Audio // Digital Designs 3515G 15 inch subwoofer
Amazon.com: 2X SoundXtreme ST-412 Premium Elite 12 Inch Car Audio Subwoofer 4000 Watts Max Power for Pair Dual 4 Ohm Voice Coil High Power Bass Surround Sound 12" Sub Speaker System Pair : Electronics
DD AUDIO SW12a-D4 12" SUB WOOFER 600W DUAL 4-OHM CAR SUBWOOFER BASS SPEAKER NEW | eBay
DD Audio 700 Series 12" - 1200w RMS Car Audio Subwoofer