Now, things get a bit more interesting.
As some of you will know, I got a sixty hertz humb for christmas, when I got my Heil PR22. Until today, I thought that the humb was being caused by a problem with the lines, as plugging my Sennheiser E835 into the same jacks caused an identical hum. Well, Yesterday, Dad decided to buy me a UPS (which I no longer have), that has power conditioning functions, I.E. Line filtering.
We set it up, and oo looky. Same hum, but also some residual hum from the mixer I did not notice before. After connecting all power strips to each other and pulling the UPS out, eliminating most causes of a ground loop, it disappeared. Mic preamps were still humming with the Heil though. When I plugged the Sennheiser in, however...the hum disappeared. So Dad fixed a problem, and exposed another.
Looks like it's time to see what Bob Heil or one of his associates thinks of all this. More details as they happen.
We set it up, and oo looky. Same hum, but also some residual hum from the mixer I did not notice before. After connecting all power strips to each other and pulling the UPS out, eliminating most causes of a ground loop, it disappeared. Mic preamps were still humming with the Heil though. When I plugged the Sennheiser in, however...the hum disappeared. So Dad fixed a problem, and exposed another.
Looks like it's time to see what Bob Heil or one of his associates thinks of all this. More details as they happen.