I have just hooked up a Supernait 2 to replace a 122x/150x. The source (yes need to upgrade) is Sonos port via Chord Clearway COAX to Arcam rDAC via Chord Clearway RCA-DIN to the amp.
On the old system this worked fine. On the Supernait 2 I’m getting a loud hum/buzz through speakers, which changes with the volume dial. Everything is plugged into the same power strip.
I have tried a few other cables, and different sockets and taken the DAC out of the chain. All have made no difference.
I have also tried a cheap ground loop isolator which also made no difference.
What could be the problem?