This may be all subjective. But it may all be objective too.
It is not only genes but it's is the environment too.
For example moving coil microphones attract magnetic dust.
Maybe too little may raise the reasonan frequency and make the mic sound less bass bass heavy. But past a point it may be a bad thing.
(For explanation of how magnetic dust can be removed from the membrane see Lou Burroughs book on Microphones).
Yesterday 2 Sennheiser MD21 had arrived from the same eBay seller.
The Grundig gold one sounds like gold. Amazing in every respect. Connected to a Pleiades 130Ω,40mH gentle low cut filter (to reduce brain perceived bass heaviness) it sounds like someone is talking or singing next to you.
The Telefunken one sounds like a broken telephone. Initiating the nightmare of opening it up...
Everything was tried to be done under a big magnifying glass.
Wearing googles to protect eyes from metal tiny particles, the 2 pins where gently hammered in.
The metal brace was removed.
Then the metal grill was removed.
Then a cloth was revealed.
There were big iron fillings passing trough the pores of this cloth.
Eye brow tweezers were used to remove them. It was a joy seeing the metal jumping to the magnetized tweezers by the surrounding magnetic field as is described in the Burrougs book on the screwdriver example. The useful trick is one must not touch anything and you do not have to touch anything, it just jumps out.
Mic sound already a bit better.
Then the cloth was removed.
Horror of horrors there was so much magnetic dust around the air gap area.
Just a bit was tried to be removed.
Mic sounds already a bit better.
It is still very bright. And music ambience sounds bright but of very good HF quality.
If the capsule is removed from the back chamber, the sound is horror of horrors. Honky-tong.
More protective layers can be removed to reach close to the air gap. But may not be tried. The sound of the mic without any bass heaviness is interesting. Let's wait a bit a see.
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