51 pc speaker system series logitech z colour black transmission mode cable analogue inputs stereo rca input 35mm jack input line in 6 channel direct digital inputs digital input coaxial 2x digital input toslink analogue outputs loudspeaker terminals power rating 500 watt frequency response 35 20000 hz speaker system 51 surround sound systems dolby digital 51 dts 3d stereo thx system active power supply mains connection suitable for smart