Reply To: Ringing Out The Room – Channel or Overall PEQ?

[Andreas]

From what I read between the lines I’m not sure if checking for room resonances should be the first to look at.
With IEMs and proper mic and speaker placement you normally should not have big issues with feedback.
As already asked: Are there any gates/compressors in you vocal channels? Turn them off, at least for testing.
When your singers are not singing loud enough, turn down their IEM level…
I’ll add another question: How does your feedback sound? Is it a sort of low end oooooommmmmm? That’s a room resonance, should be easily dealt with one PEQ notch in LR (or fill in some audience).
Is it a higher pitch feedback, ensure you’re FOH speakers are not feeding your mikes. A different placement would be the correct solution. Maybe you could post a draft of your stage layout (including FOH speakers).

There are so many possibilities, you really need to learn to isolate your problems one by one. Then, when its properly identified, you can judge how to deal with it.