Turning to balanced solves the Hum?, I presume completely or is there still some slight noise as I would think there is more likely a problem in the loop that would need addressing as runs of say 1M - 3M RCA is the preferred method.Theresa, I would not be so quick to put the RCA and balanced in the same category. I've had terrible ground loop problems (with short cable runs, that is!!) and after trying EVERYTHING the only way to get rid of the hum and buzz was to switch to all balanced. Again, we're talking less than 10 feet!
Can you not run in a new spur for say the power amps to isolate them from the more sensitive parts of your set up?