This is in a mic where the membrane in the capsule is for some reason stuck. In fact the coil is stuck by a very large excursion outside of the magnetic air gap.
The measure inductance is about 2mH.
This inducstnce must form a high cut filter together with the preamp input impedance, hence an apparent loss of HF if the prea,p input impedance is low?
Whereas on a working D190 the inductance is measured as -2.5mH whatever that means.
(Related concepts: notional impedance, radiation impedance).
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