The HS8S 8" Powered Subwoofer from Yamaha features an eight-inch cone woofer that is capable of up to 150W of output. It can reproduce frequencies down to 22Hz and features variable low and high cut filters between 80 and 120Hz. You can connect to the HS8S through its stereo XLR or 1/4" TRS inputs. It also has stereo XLR extension sub outputs.Speaker port design can greatly influence the clarity of overall sound. Often a vortex at the either end of the port can generate air vibrations inside of the port, causing unwanted noise. By adopting a noise reduction technology that incorporates an analysis of a visual representation of the sound, Yamaha's engineers are able to control and reduce the vortex.