ARC (Audio Return Channel) allows audio signal from TV to be transmitted back to the home theatre receiver via HDMI version 1.4 cable.
What is ARC port and why to use it?
Published on 2017-02-28
General ARC connection advice
There is no need for connecting a second cable between the TV and the home theatre system. As a result, you can listen to the audio of the TV with the sound quality of the home theatre.
Note: Both your TV and the home theatre system need to be “ARC supported” in order to utilize this feature.