Sony X85K Getting Started page 72

Digital optical cable connection
1
Connect the TV and audio system with a digital optical cable.
Connect to the audio system's digital optical input terminal.
(A) AV receiver or Sound bar
(B) Optical audio cable (not supplied)
2
Adjusting an audio system
Hint
For more information, please visit the Sony support website.
Support Site
Related topics
No sound but good picture.
No audio or low audio with a home theater system.
[54] Audio system (such as an AV receiver or sound bar) | Audio system (such as an AV
receiver or sound bar)
Adjusting an audio system
After connecting an audio system to the TV, adjust the TV's audio output from the audio
system.
Adjusting an audio system connected with an HDMI cable or
digital optical cable
(B)
(A)