Subwoofer series yamaha soavo system 1 way system principle active frequency response 18 160 hz crossover frequency 40 140 hz amplifier type digital colour black housing surface veneer speaker enclosure bass reflex number of subwoofers 1 bass chassis 250 mm speaker terminals screw terminal gold plated analogue input analogue audio input rca width 410 mm height 457 mm depth 462 mm weight 32 kg area of use home cinema installation opt