Sharper Image SA251TNM - Subwoofer - 20 Watt Comes with 5-foot power cord and 5-foot subwoofer cable. Subwoofer's slim 6.25" profile makes it easy to stow behind a couch or chair. Universal (speaker level) input for systems without subwoofer outputs. 20 watts RMS, 40 watts peak. Down-firing bass reflex design for slow distortion and extended low frequency response.