TS-W311D4 - 12" Champion Series Subwoofer with Dual 4 Ohm Voice Coil | Pioneer Electronics USA
Pioneer 310D4, Carrozzeria GM-X9400 and Rockmars amp - Car Parts - PakWheels Forums
Pioneer TS-W312D4 | Car Entertainment, Subwoofers, Champion Series Subwoofer, Champion Series Red Subwoofer | Pioneer Middle East - Car Stereo, Car Subwoofer, Amplifier