Don,
The college is updating their system. It should be up and running again on wednesday. The noise was not a bad ground type of hum. I had all equipment plugged into the same outlet using a surge protector. I could make the noise go away by turning down the master volume. Normally that won't make a bad ground hum go away. Maybe the X1 was acting as an antenna and picking up the ice maker or something. I'll check further.

You tipped Uncle Dave so he wouldn't bite didn't you?

Later

Tom