Pioneer TS-A301D4 12" subwoofer with dual 4-ohm voice coils at Crutchfield
Pioneer Sealed 12 in. 1300-Watt Active Subwoofer with Built-in Amp TS-WX1210A - The Home Depot
Amazon.com: PIONEER TS-SW3002S4 12" 1,500-Watt Shallow-Mount Subwoofer with Single 4ohm Voice Coil : Electronics
Pioneer TS-D10D2 D Series 10" Dual 2-Ohm 500W RMS Car Audio Subwoofer DVC NEW | eBay
Pioneer TS-D10D2 D Series 10" Dual 2-Ohm 500W RMS Car Audio Subwoofer DVC NEW | eBay
Pioneer TS-A3000LS4 - 12" Shallow-Mount Subwoofer with 1,500 Watts Max. Power - Walmart.com
Pioneer A Series Speakers
Pioneer TS-W312D4 | Car Entertainment, Subwoofers, Champion Series Subwoofer, Champion Series Red Subwoofer | Pioneer Middle East - Car Stereo, Car Subwoofer, Amplifier