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Membrane damping and backplate distance
Author: Posted by David Satz
Date: 04/17/2004

Hello, Klaus--
You've posted your question several hours after the close of the European business week. I'm anything but a spokesperson for Neumann, but: I believe the answer has to do with the volume of air between the membrane and backplate. When the distance from the membrane to the backplate is reduced, the elasticity of this air mass also decreases--thus increasing the damping on the membrane, all other things being equal.
I'm somewhat out of my depth with this answer, so I hope to get confirmation or correction from Neumann or from someone else who has formally studied acoustics. But if I'm not mistaken, this term in the equation should also be of interest when considering the extravagant claims sometimes made for ultra-ultra-thin microphone membranes.
--Best regards  
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