AUDIOPIPE 12 in. High Power 3000-Watt Dual 4 Ohm Car Audio Subwoofers 2 x TXX-BD2-12 - The Home Depot
Amazon.com: Massive Audio SUMMOXL154-15 Inch Car Audio Subwoofer, High Performance Subwoofer for Cars, Trucks, Jeeps - 15" Subwoofer 1500 Watt RMS, 3000w MAX Dual 4 Ohm, 3 Inch Voice Coil. Sold Individually : Electronics
Amazon.com: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer : Electronics