Interesting. I have bel canto monoblocks and I use balanced interconnects and no hum. But I tried some RCA ICs once and did hear a hum. Couldn’t get rid of it and went back to balanced. And, I have a Cambridge streamer as well—will have to investigate weather it’s the antenna causing the hum.
Do you use the AQ power cables with the bel canto amps? What are your thoughts about their interactions? I have 500Ms and haven’t found a power cable to be much different than stock.