And the cardas adapter fits just fine on the rca outs of this dac? Interesting to try it just to check.
If the new adapter isn’t a tight fit I would reach out to the manufacturer and confirm i looked at a few pictures and I see different connectors are used for coax in and it’s not consistent from dac to dac…this is typical with boutique manufacturers as they would use whatever is available I’m not excluding the possibility for that being the case even with the parts used inside the chassis as well.