toslink vs coax for sound card out

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Interface.

I think this might depend on the interface at the input of the DAC.
If the DAC input ( or even the Sound card output) has a coupling transformer , I guess it should be fine. The two circuits should be electrically isolated. Sometimes however you have some resistors or caps going to the cahssis which might (?) compromise the situation.
Can anyone with more experience using these transformers comment on this issue?
Cheers.
 
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