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Do you think you have a ground loop as the cause for this?
Check out solutions for Ground Loop by using searching for it in this forum. When I had one in the past, I purchased a HumX (EBTech is the manufacturer?) which could be used in a pinch when traveling. Laptops seem particularly prone to this. Try running your laptop off battery power and see if the hum goes away.
Try getting everything powered off one outlet. That sometimes will solve the problem.
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