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In "laboratory" situations.
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Exactly,
that's why some arbitrary 3:1 rule makes no sense.
With all the various frequencies being emitted, how can you find an actual sweet spot? After creation, I don't think a 440 Hz wave will ever be in phase with a 12360 Hz wave except on rare, essentially random occasions.
It will always and necessarily be a compromise between frequencies you find in phase and those you find out of phase.