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Re: Membrane damping and backplate distance
Author: Posted by Erik
Date: 04/18/2004

When the bias voltage is enlarged, the capsule is pulled more to the back-electrode, causing smaller distance inbetween this backelectrode and the membrane, causing a tighter air volume, giving a higher damping. What´s the result in output value, boost of HF?
The TLM 50 having less than 10 micron back-electrode membrane distance, lowering the bias engages a high boost, may I assume enlarging the bias would cause a cut in HF?
And what about the membrane tension. If the bias is enlarged not only the membrane is pulled to the backelectrode a bit more, the total tension of the membrane gets higher, the membrane gets stiffer, and when in case of a KM 84 the distance between back electrode and membrane is so large it would not affect the HF at all, still the compliance of a plastic membrane can cause a change in HF. The harder the membrane, the more low cut and high cut in case of a cardioid. Or?  
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