Originally posted by okabass
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Otherwise chances are that you are primarily hearing the effect of the different inductances.
If the differently shaped coils to be compared have the same number of turns and the same cores/magnets/wire size, the thinner and longer coil will have less inductance, somewhat higher capacitance and most of all less output with respect to the shorter and wider coil.
Your coil height of 13mm doesn't seem to be extraordinary, so the effects won't be too strong depending on what other size you are comparing to.
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