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 sense...no vibration/rattle/reverb from the cabinet. (Right?)1poorguy
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