Male singing tried .
Both mics sound almost unbearable without the Pleiades (130Ω,40mH) ie a 130Ω resistor in series with an inductor of 40mH and total in parallel with voice coil. The MD 611 M even more bass unbearable, unbearable room bass heaviness added and the D190 sounds mid, bass mid barking.
The particular MD611 membrane had been thoroughly cleaned a few months ago from dust metal particles. A very nice job was possible as the coil had been broken, the membrane could be removed from the magnet assembly so cleaning was extremely easy with a camel hair painting brush etc. the lucky the coil brake could be repaired by inserting the soldering iron tip to the side of the capsule almost by chance as the brake could not be seen, melted solder found its place and joined the very very thin wire. A striped wire wrap wire was implanted on top of where the coil wire coil continues at the side of the capsule to guide the solder. The extremely well cleaned membrane makes the mic sound possibly as new although there is a small hole on the side of the very thin plastic diaphragm. Later addition: if memory is correct the membrane was not removed from the magnet assembly but cleaning was nerve there's possibly by gentle abrupt artist soft natural hair paint brush strokes.
With the Pleiades (130Ω,40mH) filter the MD611 M sounds very bright and detailed. Somewhat like the quality of the When I Fall in Love - Nat King Cole world class vocal. This clearly demonstrates the detailed and focused quality that moving coil (dynamic) mics can give that some condenser mics can only perhaps dream of.
With the Pleiades (130Ω,40mH) filter the D190 sounds very natural with no bass, or treble emphasis. Barking effect disappears. No hype but detail.
With the Pleiades (20Ω,11mH) it sounds much brighter and mic can be approached to 1in.
Signal path:
male voice at various singing registers - mic at 6in or less - Pleiades (R,L) - Western Electric 1:2 step up transformer only in the case of the (20Ω,11mH) filter - Sony TC-D5 Pro in mono mode - Sennheiser HD 580 - listener's (singer) brain
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