I don't know the formula, but I use this calculator for practical application.
Piston Excursion calculator
Piston Excursion calculator
There is none between only those parameters. There is a relation if you include the sound pressure level and assume a closed box (and drive the unit to it's xmax).
Ok can you tell me that relationship?. I asked this coz i had seen a chart of frequency, Xmax and Sd for a case with same acoustic power. (I think it was for closed box case)
As to piston size vs frequency output drops at square of inverse hz below resonance.
This is due to the diagram not being able to 'grip' the air and it moving slower to reproduce longer wavelengths.
The solution is a diaphragm which in creases surface area as frequency drops, TRW-17 or propeller on a plane as used for braking.
This is due to the diagram not being able to 'grip' the air and it moving slower to reproduce longer wavelengths.
The solution is a diaphragm which in creases surface area as frequency drops, TRW-17 or propeller on a plane as used for braking.
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