Subwoofer series audio pro addon power rating 150 watt system 1 way system principle active frequency response 35 130 hz crossover frequency 50 130 hz amplifier type digital control features adjustable transition frequency switchable phase control design down firing subwoofer speaker enclosure bass reflex number of subwoofers 1 analogue input analogue audio input rca width 275 mm height 295 mm depth 295 mm area of use home cinema installat