The yst-sw315 is Yamaha's newest subwoofer model, designed to provide extremely high quality bass performance for the enjoyment of both music and movies. it use two highly acclaimed technologies, advanced yst and qd-bass, to deliver deep and powerful bass with an amazing degree of clarity. a bass (bass action selector system) switch lets you choose between music and movie modes and you can also adjust the cutoff frequency of the high cut filter, giving you the best possible response with every sound source. sophisticated and powerful, this subwoofer will make every system sound a great deal better. General information - manufacturer - Yamaha corporation general information - manufacturer part number - ystsw315 general information - manufacturer website address - Yamaha general information - brand name - Yamaha general information - product model - yst-sw315 general information - product name - yst-sw315 subwoofer system general information - product type - subwoofer system miscellaneous - additional information - qd-bass (quarter dispersion bass) technology advanced yst (Yamaha active servo technology) pwm digital drive high efficiency amplifier with 270w dynamic power auto standby with sensitivity selector physical characteristics - weight (approximate) - 41.89 lb.