BOA121 - 12" 6,000w Dual 1 Ohm BOA Series Mega Subwoofer by Massive Audio® - 1800woofers.com
HIPPOXL104 - 10 inch Subwoofers | 2000 Watts RMS Dual 4 Ohm 3" V.C. Mega
Amazon.com: Massive Audio SUMMOXL124-12 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 12" Subwoofer 1500 Watt RMS, 3000w MAX Dual 4 Ohm, 3 Inch Voice Coil. Sold Individually : Electronics
Massive Audio SUMMO XL 104 3000 Watt 10" Dual 4 Ohm Car Audio Subwoofer New | eBay