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That might be RF interference, "clean" or "dirty" power, etc.... If your rack is normally quiet, that'd probably rule out an internal ground loop; I'd look at the power source. One club I used to play in was notorious among area musicians for having two outlets on different circuits on the stage; the one at stage left was OK, but the other one was on the same line as some of the bar equipment, and (normally quiet) amps plugged in on that side would buzz like a smoke alarm. -t- --- THusken@aol.com wrote: > What is it that would make a usually quiet (large) > rack of gear, at times, > produce a loud hum. I'm curious because often my > gear is quiet, but at times > can be rather noisy. __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com