Subwoofer series monitor audio mass power rating 40 watt effective output 100 watt system 2 way system principle active frequency response 30 120 hz sensitivity 84 dbmw noise level 104 db impedance 20 ohm recommended amplifier power 25 100 amplifier type digital housing material mdf enclosure treble chassis 25 mm number of subwoofers 2 bass chassis 250 mm width 420 mm height 385 mm depth 385 mm weight 16 kg area of use home cinema