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15.17. Summary of electrostatic loudspeaker design

We can see from Eqs. (15.19) and (15.20) that to maximize the radiated sound pressure, the field strength E P /d should be as close to its maximum allowable value as possible, which is around 2   kV/mm. Similarly, we generally set the maximum peak signal voltage $MathML$ to the same value as the polarizing voltage E P because the maximum sound pressure is proportional to the product of the two, but their sum should not exceed 4   kV/mm.
If the gap distance d is reduced, we can reduce both E P and $MathML$ while keeping the sound pressure constant. Hence ...

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