A .R is an audio link that is meant to replace other cables between the TV and the receiver A /r or speaker system. This direction is used when the TV produces or receives video streams instead of other equipment. A typical case is the execution of a program on a smart TV such as oix، but the reproduction of sound is done by other equipment. Without the ARC, etc. the sound output from the TV must be by Cable, another, usually TOSLink or RCA, the speaker system can be driven.