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IF all your grounding is connected, it should be gone.
IF your mixer's ground plug that goes into the wall jack is not there, you're fuk'd.
IF you mixer's ground plug that goes into the wall jack is there, then your wall jack may not be properly grounded.
IF your amps or speakers are not grounded, you'll get that hum sound.
Most amps tend to cause a small hum when maxed on their volume output. The answer is to lower the amp's power and turn up your mixer's main out to compensate.
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'-.SgtFoo.-'
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