Core Infinity listening impressions and comparisons

[Confused]

Originally it was advised that the CI board would be installed by the Dealer, but then this changed to Paris or designated workshops (e.g. USA, Canada, Australia, etc.). There was also mention about some 'additional tweaks' required, not just installation of the CI Board.

May be these 'tweaks' are the reason for the S/PDIF & AES/EBU SQ uplifts?

Absolutely, that is exactly what I am thinking.  Furthermore, this could relate to clock implementation.  As someone thinking of splashing out on a Mutec REF10 next year, I would like know exactly what they have done and the implications for this on the AES clock extraction.  All we can do for now is speculate and experiment.