I believe that your DAC or your preamp will only allow you to choose one selection at a time, be it BNC, Coax, Toslink, Digital balance, so it should not matter. I have an optical (toslink) connection from my Touch to my DAC and a coax from my Mac mini to my DAC. I have to select optical or coax even if both sources are playing at the same time. This then goes to my preamp via analog rca connectors. I hope that this answers your question.
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