Are you sure it isn't supported? I had this exact same model Nuc ordered from Jriver that was running Linux. I had no problems running 192/24 using the direct connection with ALSA. In fact, it was padding everything to 192/32. I returned it to Jriver because I'm not comfortable with Linux.
While running Windows 10 on my new Nuc (though the same 6cay model as the one I returned), I can't even get a clean 24 bits on 96/24. Jriver software says it is playing back at 192/16 because there aren't enough bits. It sounds more like an operating system thing. I can get 96/24 padded, which implies, I think, that it can't get a clean 24 bits even on 96 or 88.2 khz.
Are you saying t he Nuc isn't capable of 24 bits at all, because I'm pretty sure I got that, and more in Linux?
When I go into Sound properties in Windows it shows my default Marantz receiver and it says it supports 16 and 24 bits and all the way through 192khz - but there are no check boxes for any of the combinations for me to try (I can't even select cd sound, 44.1/16). It just says it is supported.
Thanks for any additional help/insight you can give.
This message was posted on behalf of Intel Corporation
Thank you very much for your prompt reply, zonk.
The 192/24 format will not be supported by this model of NUC. In the following link, you will find the Technical Product Specifications for this specific NUC. On page 3, "Specification Changes or Clarifications" section, on September 2017 this feature was removed from this document since it is not supported by the NUC: https://www.intel.com/content/dam/support/us/en/documents/mini-pcs/nuc-kits/NUC6CAYS_NUC6CAYH_TechProdSpec.pdf
Please bear in mind as well that Windows® 10 is the only Operating System Supported by your unit.
So this is frustrating. I just had this same model Nuc running Linux which supported 192/24 and 96/24 using ALSA.
Is it possible that an older version of this model with a different type board supported these formats?
Also, after reading that document you attached, does this mean this Nuc doesn't even support 96/24?
Is so, do you gave any Nuc kits that do support 192/24 via hdmi (or toslink)?