Solved! hum from mixer

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Feb 17, 2020
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Hi guys new to the forum here. I have an Alessis Multimix 8 USB that is having a humming/buzzing sound even when nothing is connected while listening on headphones or pc. I can get the hum to lower by increasing the volume on line 3 while listening on line 1. Not sure if ground loop, I've tried using a different power supply and on a different wallplug. I currently have it opened up to see if I can figure something out. Anyone here have a similar experience and solutions? Thanks
 
Feb 17, 2020
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I experienced similar issues in the past when connected to power with a poor ground. Does this issue occur all the time, via all outlets?
I've only tried it on 2 outlets with ups and 2 without+power strip. It has humming on all of them. The power brick doesn't have a ground prong but it works fine on another mixer.
 
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