ViewSonic X11-4K - Audio Connection

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Audio Connecon
You can connect to various external sound delivery devices via the AUDIO OUT,
AUDIO IN, and S/PDIF ports.
NOTE: The HDMI 2 port supports ARC. It can deliver sound to external devices
via the HDMI 2 (ARC) port.
AUDIO
OUT
AUDIO
IN
S / PDIF