LG SP9YT Owner's Manual page 32

c Install the LG WOWCAST on the rear panel of your TV. After attaching the double-sided foam tape on the LG
WOWCAST, fix it to the rear panel of the TV.
d Press the Function
e On your TV's settings, set the output speaker to [HDMI ARC].
f When the connection is automatically established with the LG WOWCAST and the sound bar, "LG
WOWCAST" scrolls, and then "ARC" or "E-ARC" appears on the status display of the sound bar.
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button repeatedly until "OPT/HDMI ARC" appears on the status display.
USB
HDMI IN
(eARC/ARC)