51 speaker system transmission mode cable number of speakers 6 components 1x subwoofer 2x surround 1x centre 2x front front speaker type 2 way dimensions front wxhxd 100 x 150 x 120 mm front weight 054 kg dimensions centre wxhxd 250 x 100 x 120 mm centre weight 084 kg surround speaker type 2 way dimensions surround wxhxd 100 x 150 x 120 mm weight surround 054 kg subwoofer types active direct emitter sidewire bass reflex system dimensions sub