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my suspicion

The power draw from the monoblocks is the cause of the hum. If you put two romex's side by side and power one..there will be a voltage induced between the grounds of the romex runs. This is what I believe you experienced.

If you have the electrician do anything, have him tie the grounds together at the outlets. That could be as simple as attaching the boxes if they are steel, or may require running a seperate wire. Note that I do not know if doing so is code, you need to ask the electrician. When he is there, have him connect the grounds, then you try the amps on two lines..if the problem is gone, voila.

Cheers, John

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