Audirvana (Studio nor 3.5) does not recognize coaxial (RCA) connection of my Chord Quest DAC, which is connected to my iFi ZEN Stream. It finds only USB connection*
Here is the schema of my connections:
iFi Zen stream output to Qutest input by coaxial-RCA, Qutest analog output to my ampli by RCA cables
With ROON this works very well !!!
Sorry my problem is solved. In fact I had to change manually the output device of playback option in my streamer, to SPDIF everytime I change the input of my DAC SPDIF/USB
With Roon, it was done automatically.
It seems that iFi streamer is going to release a firmware with this function.