http://www.ebtechaudio.com/he-2des.htm
This will get rid of the hum (take note any live sound engineers this is the most effective/usefull bit of gear I own !!)
But i really think that if you got one you'd be just be fixing the symptom and not the cause .Smells like a bad earth somewhere in your setp up .
Are all your devices plugged into the same power point ??