I am running the mentionned usb/spdif converter via bnc or spdif-out in to spdif -in on the M51.
However my choice for the Hydra X + was influenced by its HDMI/I2S-output, as the M51 could have be connected with my Viablue-Hdmi-cable...
Unfortunatly, there seems to be an incompatibility, as the Dac says "unlocked" and therefore no sound on hdmi1 or hdmi2.
Asking at Audiobyte, I received the following "explanation" after I saw their new Hydra Z (Adjustable I2S output clock polarity, to match all HDMI/I2S/LVDS dacs available):
"the issue with M51 is not clock polarity, but it's the different data formats used. I'm afraid you will not be able make the combo working over HDMI cable."
Question to head-fi: What are these data formats? Can the Hydra or the M51 be modified in order to avoid this mismatch, perhaps via software upgrade?
I would like to understand, why there should be no solution...
Thanks, and best regards,