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Pioneer Champion Series TS-A301S4 and TS-A301D4 - What's in the Box? - YouTube
Amazon.com: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer : Electronics
Pioneer Electronics on Twitter: "The Champion Series Subwoofers feature an enclosed basket structure that is designed to support the steel basket by reducing the spread of vibration that causes bass loss frequency. #
Champion Series Subwoofers | Pioneer Middle East - Car Stereo, Car Subwoofer, Amplifier