LG CineBeam PF510QC Owner's Manual page 104

Using an eARC Supported Audio Device
(Q. Settings) →
eARC is a technology that enables faster transmission of more acoustic information
because it has a wider bandwidth than conventional ARC. Through the connected audio
device, the sound of the projector can be output in a higher quality sound than ARC.
1
Connect an audio device that supports eARC to the HDMI (ARC) port.
2
Select [HDMI(ARC) Device] in [Sound Out] → [Use Wired Speaker].
3
Set [eARC Support] to [On].
→ [Sound] → [Advanced Settings] → [eARC Support]
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