51 speaker system surface matt colour black transmission mode cable number of speakers 6 components 1x subwoofer 1x centre 2x surround 2x front recommended amplifier power 30 100 impedance 4 ohm front speaker build type bookshelf speaker front speaker types 2 way bass reflex system closed mdf enclosure wall mountable removable front cover front enclosures 1 x 25mm tweeter 2x 100mm midrange subwoofer music handling capacity front 90 watt power handli