Especially on ribbon mics when used for singing at a small distance (a few inch) this mid heaviness may dominate and mask treble frequencies.
When bass heaviness or mid bass, mid heaviness is removed by for example a Pleiades (R,L) gentle slope high pass filter a good ribbon mic or a good mic of any type should sound like the vocals of The Power of Love - Frankie Goes to Hollywood.
The Power of Love - Frankie Goes to Hollywood
https://m.youtube.com/watch?v=NyoTvgPn0rU
Signal Path:
Male singing voice at a few inch - various mics - Pleiades (130Ω,40mH) filter - German in line GSM 1, e+p relatively low primary inductance step up transformer - Tascam Porta 07 - Sennheiser HD 580
Without the Pleiades (R,L) filter on all mics tested the sound is harsh and distorted at mid range. It sounds as if someone is singing inside a barrel or a room of small volume.
With the Pleiades filter sound is smooth big and extended.
Tests recorded on 19031715 date time code cassette.
The mics used:
Lustraphone: very nice, a bit metallic which can be nice
Sony ECM-250: very impressive
Fostex M88RP 600Ω: very impressive, smooth
Beyer M119: very impressive some mid high accent (mostly due to particular Pleiades filter not optimum for its 250Ω impedance
Refining R,L values may be needed.
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