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

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Andreas
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Setup PA in dining room? Guess its rather easy to get feedback at any frequency you want, just by moving the mic a little.

How large is your room to accomplish setting up the mic behind the PA?

I assume I’m reaching maximum gain before feedback?

yes.

And -3db is nothing to handle resonances but something cosmetic to the sound. If you have a real room resonance (the ones you observe below 400Hz), try to notch out at least -6dB or even further (thats why you want a rather high-q/steep notch filter).

A resonance accumulates same sound coming back in phase at one spot (your mic). Assuming a single reflective wall you’ll see an amplification of +6dB at the resonant frequency. To counteract that one with some EQ you have to drop by at least -6dB. If sound accumulates from multiple sources, more reduction may be necessary.