Boston Acoustics Classic Series CPS10Wi Wireless Ready Powered Woofer (Black) 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 10-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