Buz in Right Main channel when sound comes through mic ZED-436

Hello all,

We have a ZED-436 we just installed a week or two ago. We noticed last week we are getting a buzzing sound through the right channel speaker when sound is being picked up through a microphone. We tried checking to see if any particular channel was causing it and it does not seem to matter if any one or more are muted. We cannot say for certain one way or the other if this is just with mics or also with instruments, but we defiantly notice it with mics. We know it’s R channel only as we slide down the R main and it’s gone. This is not coming through the monitors or hot spots. Messing with eqs did not remove it. I know there are a number of things that can cause this, but does anyone have any advice?

ground loop?