51 speaker system series yamaha ns colour black number of speakers 6 components 1x subwoofer 2x surround 1x centre 2x front impedance 6 ohm front speaker types 2 way magnetically shielded front enclosures 1x 80mm subwoofer 1 x 19mm tweeter music handling capacity front 100 watt power handling capacity front 100 watt frequency range front 30 27000 hz dimensions front wxhxd 112 x 176 x 116 mm front weight 06 kg central speaker types magnetically s