Danaroo, as with the original question posed in the thread I doubt that a consensus can be reached concerning your question. One reason for that, IMO, being that the answer will be dependent on the designs of the specific components that are involved, and in ways that don't have much if any predictability. The answer is also likely to often be dependent on the lengths of the various cables in the system.
See my post here for discussion of some of those dependencies.
My post here, earlier in this thread, may also be of interest.
Without knowing anything about your system beyond what is stated in your post above, though, my guess is that what may make the biggest difference would likely be changing the optical cable you mentioned to a coaxial S/PDIF or AES/EBU cable (depending on what your DAC can accept). With the odds being in favor of that difference being for the better, although not necessarily.
Regards,
-- Al
See my post here for discussion of some of those dependencies.
My post here, earlier in this thread, may also be of interest.
Without knowing anything about your system beyond what is stated in your post above, though, my guess is that what may make the biggest difference would likely be changing the optical cable you mentioned to a coaxial S/PDIF or AES/EBU cable (depending on what your DAC can accept). With the odds being in favor of that difference being for the better, although not necessarily.
Regards,
-- Al