DAC Output Splitter

just tried it - doesn't work if both cables connected

In that case I would look for a SPDIF switcher like the following:

https://inday.com/da4x.html

https://www.cs1.net/products/cable_solutions/DAS-001.htm

Thanks !

actually it works if the other component is in standby...so all is good for now

Are you mixing analog RCA with Digital Coax?  Are you talking about the input to your DAC or the analog output?