@russ69 If it ain’t broke, don’t fix it. The RCA’s only weakness is long cable runs, the XLR solved that issue and is a standard at this point. The BNC offers nothing in the way of improved sonics.
Is BNC genuinely better sounding in audio components than well implemented RCA? I have to believe if manufacturers truly felt BNC was superior sonically it would be used in place of RCA on a regular basis. Some of the absolutely best sounding audio components are utilizing RCA connection.
Charles.