Articnoise
Headphoneus Supremus
If I remember it correctly, the difference between RCA and BNC has something to do with the impedance. BNC is easier to maintain the 75 ohm impedance than RAC.
I might be wrong since it was a long time ago when I was interested making cables.
You remember it correctly, it’s easier to make a true 75 ohm impedance BNC connector than a RCA.
The question is how big of a deal is it for SQ if the connectors would be 77 Ohm instead of 75 for an S/PDIF signal.