Over the last few years I tried various combinations.
2 sources : Project RS2T CD and Mac mini going to Devialet 250.
Using :
- USB cable by itself, then with various decrapifiers then with Intona Galvanic Isolator.
- Digital coax
- XLR AES/EBU
- Optical
All high quality cables (200 to 300 euros each used, mostly Kimber and Crystal cables).
Tried with instant switching, and over long periods.
It was mostly hair splitting differences.
Devialet inputs are very good.
Ended up plugging the Mac mini to a Matrix D to D converter (stock $5 USB cable), then Matrix to DAC via XLR. This has given me the most consistently perfect sound out of my Devialet.