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Isn’t your degree in physics?

Yes. Though I haven't had to deal with anything like this in 20 years. Been working semiconductors. (And even 20 years ago I was doing astro-physics, not acoustics.)

But the Helmholtz gives you the initial compression wave, creating a lower pressure in the cavity so air comes back in until pressure in the cavity is higher than outside at which point the air flows out again. A damped oscillator. I would think that would create an echo, and interfere with the next compression wave the cone throws out.

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