Subwoofer series velodyne impact series power rating 150 watt effective output 250 watt system 1 way system principle active frequency response 32 140 hz crossover frequency 50 200 hz amplifier type digital colour black cabinet surface ash housing surface veneer design down firing subwoofer speaker enclosures bass reflex removable speaker cover number of subwoofers 1 bass chassis 254 mm width 320 mm height 350 mm depth 370 mm weight 1