LG CineBeam HU915QE Owner's Manual page 112

[Use Wired Speaker]
(Q. Settings) →
[Optical Out Device]
You can connect an audio device that supports [Optical Out Device] to the optical
digital audio output port to enjoy your projector's sound in richer quality and greater
convenience.
• Only available for models with an optical digital port.
• You can use the projector remote control to adjust the volume for certain
devices.
[HDMI(ARC) Device]
Sound from the projector can be output through an external audio device connected via
a HDMI (ARC) port.
•
Select [HDMI(ARC) Device] to automatically turn on SIMPLINK. Once SIMPLINK
is turned off, the output speaker settings automatically revert to the default
settings for uninterrupted audio output.
→ [Sound] → [Sound Out] → [Use Wired Speaker]
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