While concur with most (or all) that's been said already, coax isn't without its own issues.
TOSLINK Optical vs Coaxial for CD transport to DAC
I have just purchased a DAC so I can use my oppo 205 as a transport and having an optical cable on hand I just used it to get things up and running. I bought the optical cable years ago and it was advertised as being actual glass as opposed to plastic?
At any rate I'm wondering if using a Coaxial cable instead would offer better audio performance, mostly looking for better resolution of micro details.
Thanks for your thoughts and experience.