> eARC lets your TV pass those along to your compatible receiver even if the TV itself can't make heads or tails of the format. DisplayPort Multi Stream Transp

> eARC lets your TV pass those along to your compatible receiver even if the TV itself can't make heads or tails of the format. DisplayPort Multi Stream Transport (MST) serves that role. Given that you'd only be passing along the audio data, rather than the video data, you could save money by putting the slowest available hardware (only BRR-capable) into the receiver. Or, the TV could "just" pass along the audio stream to any plugged-in receiver. You don't gotta have a standard for that... just a standardized way to ask the TV to do it (assuming that you want to control the behavior and not have the conditional be "Is there a receiver plugged in? Pass along the audio and don't send it to the TV speakers.").