Signal path:
Male singing voice at 1-3 in - Shure 515SD Mexico - Pleiades (130Ω,40mH) - Sony TC-D5 Pro - Sennheiser HD580
This combination sounded quite nice. The gentle slope high pass from the series R,L in parallel to voice coil reduced bass heaviness of proximity effect, equal loudness curves, voice effort curves.
See also adding a Western Electric 1:2 step up transformer and including in the test the Shure Unidyne B USA version:
https://euroelectron.blogspot.com/2018/11/great-sound-with-shure-unidyne-b-515sb.html
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