Additional information for Sony TVs:

If you’re not hearing the audio, or the audio is low when used with a home theater system, do the following: 

1. Press the ACTION MENU button, then select Speakers — Audio system.
2. Set Headphone/Audio out to Audio out (Fixed) in the Sound settings.
3. If the audio system is not compatible with Dolby Digital or DTS, set Settings — Sound — Digital audio out to PCM.
4. Depending on your model, if Speakers is set to TV speakers and Hi−Res upscaling (DSEE HX) is set to Auto, DIGITAL AUDIO OUT (OPTICAL) is muted.
5. Set Digital audio out the volume to Max in the Sound settings.

When using HDMI input with Super Audio CD or DVD-Audio, DIGITAL AUDIO OUT (OPTICAL) may not provide an audio signal.