ARC Audio Return Channel Audio Return Channel (ARC) eliminates the need for additional composite audio cables or optical cables when connecting an audio/video (A/V) receiver or surround sound system to a TV. ARC enables audio to be sent from the TV to the A/V receiver, allowing you to watch and listen to movies and other content from the source device. What is the difference between HDMI ARC interface and others? Transmission method: HDMI is only used for video transmission, while HDMI ARC can provide high-quality audio transmission. ARC technology does not require any new cables, it can be implemented on any compatible HDMI. Connection method: HDMI cannot feed audio back to the origin, while HDMI ARC can work like a two-way audio transmitter cable, HDMI ARC is designed to provide audio return for TV speakers and other devices. They can easily configure the sound bar system available in your home. Note: HDMI is a cable, while ARC is a port or adapter. Both technologies require an HDMI cable. The design of the HDMI ARC port is different. Now, most HDMI cables support ARC. "High-speed" printed HDMI cables generally support ARC function, if the HDMI port is marked as "ARC", then we can identify it. If we connect a non-arc HDMI cable in the ARC port, it can act as a general HDMI.