(1) Pioneer Champion Series 10 inch Subwoofer, 4 ohm, single voice coil 884938266895 | eBay
Pioneer TS-W260S4 10" 1,200-Watt Champion Series Component Subwoofer - Single 4 ohm voice coil
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. #
Pioneer Premier TS-W2502D2 10" Champion Pro Series 3000W Subwoofer
Amazon.com: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer : Electronics
Pioneer TS-W310S4 12" 1,400-Watt Champion Series Component Subwoofer - Single 4 ohm voice coil