LG 42PM4700 Owner's Manual page 83

To use Virtual Surround feature
❐
HOME ➾ Settings
LG's proprietary audio processing technology allows 5.1ch-like surround sound
from two speakers.
✎ When Clear Voice II
To use Clear Voice II feature
❐
HOME ➾ Settings
Boosts voice clarity.
➙ SOUND ➙ Virtual Surround
is set to On, Virtual Surround
➙ SOUND ➙ Clear Voice II
cannot be selected.