Signal path:
Male singing voice - Revox 3500 at 2in to 6in - Dunbridge D13A 400mH inductor with resistance ie 209Ω,400mH - Sony TC-D5 Pro - Sennheiser HD 580
At the 400mH setting of the Dunbridge decade inductor box the resistance of the main (x100mH) coil happens to be 209Ω.
This 400mH setting sounded the best with no offensive bass heaviness. On the contrary bass and the rest of the spectrum was very smooth. Pity about the hum since the Dunbridge does not use air core ring inductors but normal air core inductors (coils).
Impedance of the mic is 600Ω so the 209Ω ie about 1/3 resistance creates a certain gentle slope of high pass.
How would a low resistance coil wound on a ring (nanoperm or supermalloy for example) in series with a 210Ω resistor sound like?
Other combination which sounded interesting but bright is (315Ω,37mH) from a Sowter transformer secondary with magnetic lamination core removed:
See:
https://euroelectron.blogspot.com/2019/04/fostex-m88rp-600-connected-to-air.html
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