Behringer B1800XP 3000W 18" Powered Subwoofer at Gear4music
Combo: 2x SUMMO XL124 3000W Subwoofer with D6 3000W RMS Mono Mega Ampl
Amazon.com: Massive Audio SUMMOXL104-10 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 10" Subwoofer 1500 Watt RMS, 3000w MAX Dual 4 Ohm, 3 Inch Voice Coil. Sold Individually : Electronics
3000W 12inch 15inch High Power Car Subwoofer - China Audio Speaker, Subwoofer | Made-in-China.com