Dual ALB12 12 Inch Amplified Subwoofer with Ported Enclosure
Amazon.com: Dual Electronics SBX212i 12-inch illumiNITE High Performance Studio Enclosed Subwoofers with 1,200 Watts of Peak Power & 41-Ounce Magnets : Electronics
DC AUDIO LV1 M4 12 D4 SUB 12" 600W DUAL 4-OHM SUBWOOFER BASS SPEAKER WOOFER NEW | eBay
Turbosound MS218 Manchester Series Passive 8000W Dual 18" MS218