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Hi there,
I was browsing the net and came across your hum problem. If you have established that there is a proper ground for your set-up,and yet are still experiencing hum or other noise problems in your system, you should look at buying a balanced AC power isolation unit. There is no doubt the technology works to establish a true 0V reference but also removes RF noise and other "dirt" that can be leaked into the equipment and utility ground.
I can give you more details if you would like to know more.
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