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I agree that the total flux will be the same but therefor in the same iron structure, the field in the gap will be the same, at least in the statical case.

If the system is modulated by the speach coil, a simpel measure of how well the system resists this modulation, is the ratio of resistance to inductance of the field coil, lets call it Fc.
If the  insulation thickness of the field coil wire is negligable, this ratio is unchanged and therefor the dynamic behavior will be the same as well.

Real insulations have a thickness and this inperfection will tend to upset the ballance, so that higher voltage coils by unchaged statical flux will tend to be softer (higher Fc) or more easy to modulate and therefore the unit will have higher distortion due to the magnetic nonlinearities of the pole pieces.

Higher distortion might be beneficial for the sound, I dont know.

The point to make is that it should be possible to get the same result if you put a resistor in series with the field coil voltage source, keeping the voltage over the coil the same by increasing the suply voltage.
Or even using a current source (maximum distortion)

This could, if the speculations are right, open up for tuning the sound by simple means. 
Have anybody experimented with this?

Regards
Erik

 

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