Champion CHLED332HD Operating Instructions Manual page 59

ARC audio only (same as optical or co-axial digital
audio outputs). If you want to change connected
device's volume level, you should select that device
from the source list. In that case volume control keys
are directed to connected audio device.
Note: ARC is supported only via the HDMI1 input.
System Audio Control
Allows an Audio Amplifier/Receiver to be used with
the TV. The volume can be controlled using the
remote control of the TV. To activate this feature set
the Speakers option in the Settings>System>More
menu as Amplifier. The TV speakers will be muted
and the sound of the watched source will be provided
from the connected sound system.
Note: The audio device should support System Audio Control
feature and CEC option should be set as Enabled.
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