Do you mean the hum is coming from the components or from the speakers? If it is from the components just unplug each one at a time and see if it goes away,if it does then you will know which one is the trouble.
HUM when I switch on components-
Ever since I switched over from my older integrated amp (marantz 2325) to newer, high end separates, I have an annoying audible "hum" coming from my system---of course my first thought is that something is not properly grounded (house electrical system)--, or possibly one of the components is culprit? or? I am sure many of you have been through this in the past--was hoping you might be able to help me to "trouble shoot" and figure out how best to address this problem--house is old--but all electric was redone with modern wiring etc---do not have details on fuse box in basement, etc. thanks---