51-61 ohm
40mH
This is a 200Ω microphone.
It is a directional mic therefore having proximity effect. At a small distance such as 2in the sound becomes too bass heavy.
By adjusting the Dunbridge decade inductor and resistor boxes a suitable value for male vocals is (61Ω,40mH).
For higher distance an (130Ω,40mH) Pleiades filter may be used. See older posts.
Or a variable resitor added for any distance. Similar to MD421?
Signal path:
Male voice singing (The Power of Love - FGTH) - Sony ECM-250 at 2in - Pleiades Dunbridge adjustable variable slope high pass filter - Sony TC-D5 Pro - Sennheiser HD 580 - Singer's ear brain
A systematic error may be that singer and listener is the same person (sound can also be acoustically transmuted or bone conducted , so bass perception degree is not accurate.
Vicky should be able to find the best or more suitable R,L values.
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