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
Pioneer Premier TS-W8102SPL SPL Champion Series 15" sub with dual 2-ohm voice coils at Crutchfield
Premier Pioneer Subwoofer 12in for Sale in Guadalupe, AZ - OfferUp
Pioneer TS-W2502D4 10" Champion Series Pro Subwoofer With 3000 Watts Max Power - Dual 4 ohm