A short digression into the difference between SpeakerLink and AES/EBU.

The difference in cable and connectors is well known. The difference in the protocol seems to come down to whether MHR (Meridian High Resolution) is being used or not. Is it correct to say if MHR is not used, all else being equal, (cabling and connectors are impedance matched and wired correctly), then for audio only, (not comms), SpeakerLink and AES-EBU are identical. But if MHR is used, then, (and only then), they are not identical because SpeakerLink audio is encrypted in a proprietary way.

So now it goes to when if ever MHR is used nowadays. Is it something used by some Meridian devices? Or was it always something on the way towards MQA, and later superseded? I can't find out. Anyone know?

Once upon a time