Thanks very much for the rapid response Steve.

Sorry, it's not optical, it is SPDIF coaxial.

I am struggling to get the display on the speakers to change at all. When I play an MQA track in Roon I get this;

https://www.dropbox.com/s/81h57e41tj2tsxo/818v3-display.jpg?dl=0
https://www.dropbox.com/s/0o76nddujtcytpj/dsp8000se-display.jpg?dl=0
https://www.dropbox.com/s/6nlna01wi1im3cb/818v3-Path.jpeg?dl=0

Would you anticipate any sound quality difference between SpeakerLink and SPDIF?

Cheers,
Roland