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Originally Posted by Anderson A membrane-type of resonator looks like a big box or semi-cylinder, usually rather tall/large, which usually has a membrane as a front panel. Sometimes the membrane is hidden behind a wooden front panel. There can also be two membranes.
Anyway, a standing wave at the resonant frequency of the resonator, will cause the membrane to vibrate in sympathy to the standing wave, and "absorb" the standing wave with a much higher efficiency than a Helmholtz resonator. The larger the volume of air, the lower the frequency.
They are harder to calculate, but worth it. Since they are very efficient!
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For control room use I've heard that membrane resonators don't work well at low volume since they need high energy to vibrate. Is this so? Can anyone confirm this?
/Cojo