Meanwhile sorrick has a better understanding of my issue, unlike Ken Ball, apparently, who still doesn't care and still hasn't answered my question: Why does CA recommend not to use gear that's plugged into the mains? It's the same kind of information boycot I got from the CA support. Have I already meantioned the electrical shocks you can get from the Campfire IEMs? I'm not the only one with this experience. I'm not saying it's dangerous, but it might be the key to the (self-)censorship. And yourself you seem to be blind to the info I gave on my hum issue. It's definitely not a normal ground-loop thing – if you manage to deactivate your brand-loyalty filter for a moment and take the time to read my posts carefully. And I still hope Ken will do again as well.