HDMI ARC and HDMI eARC explained: The evolution of the Audio Return Channel – Jon L. Jacobi

ARC (the acronym stands for Audio Return Channel) is the digital conduit that TVs use to send their audio—whether it be from an onboard over-the-air tuner or an onboard or USB media streamer that connects to a movie service such as Netflix—over an HDMI cable to your soundbar or A/V receiver. So it should come as no surprise that the acronym eARC stands for enhanced Audio Return Channel

ARC is superior to older methods of carrying digital audio (e.g., fiber-optical cables with TOSLINK connectors, and coaxial copper cables with RCA connectors) because it can deliver bandwidth of 1Mbps—almost three times more than those older cables, which are limited to 384Kbps of bandwidth.

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