Welcome to the Forum.
Have you followed these instruction in the Manual?
ARC
On the TV connected to the HDMI MONITOR 1 connector, set whether to receive sound from the TV via HDMI.
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On: | Use ARC function. |
Off
(Default): | Do not use ARC function. |
You can adjust the volume of this unit using the TV remote control.
If using this function, use a TV compatible with ARC (Audio Return Channel) and enable the HDMI Control function of the TV.
When “HDMI Control” is set to “On”, the “ARC” settings automatically switch “On”.
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NOTE
If the “ARC” settings have been changed, always reset the power to connected devices after the change.
Using an eARC function-compatible television enables audio playback from the speaker connected to this unit, regardless of “ARC” settings in the menu.
TV Audio Switching
Sets automatic switching to the “TV Audio” input when a TV connected via HDMI sends an appropriate CEC control command to this unit.
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On
(Default): | Select the “TV Audio” input automatically when receiving a command from the TV. |
Off: | Do not select the “TV Audio” input automatically when receiving a command from the TV. |
“TV Audio Switching” can be set when “HDMI Control” is set to “On”.
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