21 surround system soundbar sound bar speaker system 21 components subwoofer transmission mode cable wireless transmission bluetooth wi fi analogue input 35mm jack input line in digital inputs hdmi input digital input optical usb digital outputs hdmi output audio functions subwoofer external multiroom equalizer sound systems dolby digital dolby digital 20 dts supported audio formats aac flac mp3 ogg wav dsp programmes 5 digital signal proce