It could be used as a Pleiades (R,L) microphone filter.
It may be made by 2 solenoid coils wound on separate magnetic material.
They are connected in series and antiphase so that L decreases while total R remains constant.
L should be possible to be adjusted by varying the distance ie coupling between the 2 solenoid coils.
So high pass cutoff frequency can be adjusted while the relative high R creates a gentle high pass (low cut) slope.
Would it work?
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