Subwoofer series polk audio psw power rating 150 watt effective output 300 watt system 1 way system principle active frequency response 32 225 hz sensitivity 90 dbmw noise level 118 db crossover frequency 60 110 hz amplifier type digital housing surface veneer speaker enclosure magnetically shielded number of subwoofers 1 width 4191 mm height 4127 mm depth 4858 mm weight 182 kg area of use home cinema installation options floor