The inductance itself varies with frequency on some magnetic materials.
For example the Altec 4922 mic transformer when supplied with a high frequency by the inductance meter measures 330mH but when supplied by a low frequency measures 3H.
The Escort ELC-120 digital LCR meter used sends a different frequency at different selected scale by its push buttons. This was the reason for the inconsistency of measurement and bass heaviness prediction.
For example the Sennheiser MD211 sounds much more extended in lows with this transformer than expected from the initial 330mH measurement.
The shunt inductance to the mic is 3H at low frequencies and the mic can sound very bass heavy at soft singing male voice.
A brilliant mic.
By redoing experiments a suitable inductance for flat frequency response from producer's brain to listener's brain using the MD211 can be a primary inductance of the order of 470mH.
Signal path, setup:
Male singing voice - Sennheiser MD211 - Pleiades V6 with various input transformers in octal base - Sony TC-D5 Pro - Sennheiser HD580
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