I can't speak from experience, but BNC is considered a more optimal connector for use with the 75-ohm S/PDIF transmission format than the commonplace RCA's. In my rig, AES/EBU balanced 110-ohm connection is clearly superior to the latter, FWIW. Will your DAC accept BNC as well?
Best way connect. transp to DAC.Via BNC or AES/ebu
I haved a Muse 9 sign and considering using it as a transport. It only has a digital out SPDIF via BNC. Is this a high quality output? Or should it have a AES/EBU via XLR to be high class?