Subwoofer series magnat monitor supreme ii power rating 80 watt effective output 160 watt system 1 way system principle active frequency response 20 200 hz crossover frequency 50 150 hz amplifier type digital colour black cabinet surface ash housing material mdf enclosure control features volume control adjustable transition frequency design front firing subwoofer speaker enclosures bass reflex removable speaker cover number of subwoofers 1 ba