Mutec MC-3+ USB

[f1eng]

Then I tried the Mutec. It sounded better than USB straight into the Devialet to me but was very unstable. The Mutec sometimes showed up as a sound output device, sometimes it didn't. Sometimes it did, then it disappeared during playing leaving silence.
....
GRRR.

Have you looked at this : 10.11.4 OS X update is out: "Fixes an issue that caused USB audio devices to disconnect" ?

http://www.computeraudiophile.com/f11-so...post524162

Thanks for that. I will try this, and a different cable, but the fact is directly into the Devialet USB input had no loss of sound just the same cable into the Mutec.