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In effect large Helmholtz resonators.

Why do you want the air oscillating in/out of the cavity, possibly in conflict with what the speaker is trying to do? It is basically a damped harmonic oscillator, but as that is fading the cone is trying to push the next tone. I would think it would get messy in home audio.

But the concrete makes vibration/rattle/reverb from the cabinet. (Right?)


I’d tune port (several of varying lengths) and seal the speaker (s). It’s all theory now. There are some spherical speakers on the market and I like them but, for me, I’d like to design the ultimate speaker having no standing waves (and round does that).

Problem with round Helmholtz containers is each has a prime frequency the unit resonates to. The absurd answer is having a speaker per single frequency (so would need 20,000 speakers to cover the hearing range). Now that would be a crossover nightmare!

I have a design that is a parabolic cross-section and made of concrete. Stands about four feet tall and has one speaker and is for midrange. That is also on my ‘I really should get off my ass and do something’ list.

Isn’t your degree in physics?

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