The impedance would be very low and it may be stepped up with a toroidal transformer as on most ribbon microphones.
Would it be then possibly to have a pressure microphone with an extremely thin diaphragm? How is Acoustalloy developed by Electro-Voice made? Can it be read on the Electro-Voice patents.
Pressure moving coil microphones have the reasonant frequency at mid band so that they produce a flat frequency responce by damping it. This seems compatible with a light diaphragm. (Ribbons and directional moving coils need to have the reasonance at low frequency, and condenser at high frequency).
The Magnetec Nanoperm Nanocrystalinne metal glass amorphous tape wound ring cores may do the trick beautifully.
This material is made by almost instantaneously cooling the molten glass. This is done by letting it drop on a large metal rotating barrel. Its large mass opposes changes in temperature and of course it is a very lower temperature compared to the molten glass. So the almost instantaneous cooling creates this unique extreme inductance index property when the material is used as a tape wound core.
One can possibly find a video on Magnetec's website showing how Nanoperm is made.
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