Boston Acoustics Classic Series CPS12Wi Wireless Ready Powered Woofer (Black) (Discontinued by Manufacturer) Play wirelessly with the optional 2.4GHz WT50 Wireless Transmitter that delivers up to 50 feet of range Superior bass from a high-output front-firing, front-ported design BassTrac circuitry for tight, distortion-free bass at all output levels 12-inch, Deep Channel Design (DCD) woofer deliver more bass output from less amplifier power Ultra-rigid, reinforced MDF enclosure minimizes unwanted cabinet vibration to improves bass extension and detail