Epson EpiqVision Ultra LS800 4000-Lumen Pixel-Shift 4K UHD Ultra-Short Throw Laser 3LCD Smart Home Theater Projector (Black) - Manual (Page 93)

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Setting Options Description
Sound Output Other than HDMI3 (Game)
HDMI3 (Game)
Selects the sound output device and
format for input sources
Note: If sound is not output correctly,
select PCM .
Speaker/Optical (PCM) or
Speaker/Optical (Auto) : outputs sound
from the projector's speakers and to the
Optical Out port in PCM (2 ch) format or
higher quality (Auto).
ARC/Optical (PCM) or ARC/Optical
(Auto) : outputs sound to the HDMI2
(ARC) and Optical Out ports in PCM (2
ch) format or higher quality (Auto).
(Auto) supports the PCM (2 ch), AC-3
(up to 5.1 ch), and DTS (up to 5.1 ch)
audio codecs.
Note: The output audio format of the
projector's HDMI2 (ARC) port depends
on the input source. When the input
source is HDMI, audio is output up to 5.1
ch (AC-3 or DTS). When playing Android
TV content, audio is output in PCM (2
ch).
Speaker (PCM) or Optical (PCM) :
outputs sound in PCM (2 ch) format from
the projector's speakers or to the
Optical
Out port.
Optical (Digital Audio) outputs higher
quality sound to the Optical Out port
(supports PCM (2 ch), AC-3 (up to 5.1
ch), and DTS (up to 5.1 ch) audio
codecs).