Pioneer TS-W311S4 1-Way 12in. Car Subwoofer for sale online | eBay
2) PIONEER TS-A301S4 12" 1000W RMS C-SERIES SINGLE 4-OHM CAR AUDIO SUBWOOFERS – LifeAfterBass
Amazon.com: 2 X Pioneer TS-300D4 12 Inch 1400 Watts Max Power Dual 4-Ohm Voice Coil Car Audio Stereo Subwoofer Loudspeakers/Free Alphasonik Earbuds : Electronics