OP mentioned using Toslink, this is perhaps the worst interface for dac. Don't confuse this with optical networking, two entirely different things. Only streaming dacs will have optical network input.
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.