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

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What makes the PEQ little more difficult to use is finding the correct center frequency. As already stated many times the bands of the GEQ (as it is integrated inside the Qu) are much wider, so you’re operating more with a broom than a tweezer. The integrated RTA isn’t precise enough telling you the correct center frequency either. Try to feed a sine (from the signal generator, for example) to the RTA and you’ll see a bell shaped response of the RTA, not a single peak (see below).
You have two options finding the PEQ frequency. The loud variant is using a narrow Q, rising the gain on the band a little and sweeping the frequency to the right spot. Take care of your ears and neighbours, …not recommended!
The more clever approach is using a better (higher resolution) RTA which directly displays the frequencies of peaking bands. You may even determine problematic frequencies before you hear feedback. I’m using the 1/24 octave version of TrueRTA which I registered years ago before smartphones exist. I guess nowadays you will find a nice app.

The reason for the bell shaped response of the integrated RTA is based on its implementation. Obviously the Qu-RTA does not implement FFT (=high DSP load, slow for higher resolution) but more a peak detection on bandbass filters (=less DSP load, quicker response). A RTA suitable for feedback detection should do FFT calculation as TrueRTA does. Feeding a sine will show a single peak not a wide range.