The Polk HTS 10 subwoofer enhances home theater and music listening with powerful deep bass. It features a long-throw Dynamic Balance 10" driver, patented Power Port technology and a state-of-the-art 200W Class D amplifier. Easily to access controls for volume, low pass filter, and phase correction. Connect via LFE (unfiltered / low pass disabled) or stereo line level RCA inputs. Deep Bass for Home Theater and Music Front-firing long-throw 10" Polypropylene Dynamic Balance and Klippel optimized driver Floor-firing patented Power Port Technology for deeper bass response and reduced port noise Complete Control - built-in controls for variable volume, low pass filter and phase (0/180) for optimum bass levels.