- The Polk HTS 12 subwoofer enhances home theater and music listening with powerful deep bass. It features a long-throw Dynamic Balance 12” driver, patented Power Port® technology and a state-of-the-art 400W Class D amplifier. - Deep Bass for Home Theater and Music - Front-firing long-throw 12” 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.