LG PF85U Owner's Manual page 34

Using the PROJECTOR
In the case of analog broadcast
Item Description
MONO Left and right speakers
produce sound, and the
sound model is mono.
Select this menu to
listen in MONO mode
regardless of broadcast
state. This can be set
for a stereo broadcast
signal. Select MONO
in poor reception areas
(e.g., areas with weak or
erratic signals) or when
multi audio reception is
not clear.
STEREO The sound mode is in
stereo when the sound
comes out of both left
and right speakers.
Main If the station broadcasts
language/ a multi-language signal,
Sub different languages may
language be selected.
Select the Main
language to listen in
.RUHDQ