Using an Optical (Digital) or Audio (Analog) Cable ConnectionAvailable devices: Digital Audio System, Amplifier, DVD home theaterAudio Cable (Not Supplied)OptJca]Cable (Not Supplied)DIGITAL AUDIO OUT (OPTICAL)" When a Digital Audio System is connected to the DIGITAL AUDIO OUT (OPTICAL} jack, decrease the volumeof both the TV and the system.. 5.1 OH (channel) audio is available when the TV is connected to an external device supporting 5.1 OH." When the receiver (home theater) is set to on, you can hear sound output from the TV's optical jack. When theTV is receiving a DTV signal, the TV will send 5,1 CH sound to the home theater receiver. When the source isa digital component such as a DVD / Blu-ray player / cable box / STB (Set-Top-Box) satellite receiver and isconnected to the TV via HDMI, only 2 OH audio will be heard from the home theater receiver. If you want tohear 5.1 CH audio, connect the digital audio out jack from your DVD / Blu-ray player / cable box / STB satellitereceiver directly to an amplifier or home theater.AUDIO OUT: Connects to the audio input jacks on your amplifier/DVD home theater." When connecting, use the appropriate connector." When an audio amplifier is connected to the ADDIO OUT jacks: Decrease the volume of the TV and adjust thevolume level with the amplifier's volume control.Englishii