These are world class Sennheiser microphones.
If used for close intimate vocals and the sound is bass heavy Pleiades filters or other techniques (see for example the next electron post which has not been tried) may be used.
But what if the sound is treble heavy too to listener's brain.
A very nice gentle high cut can be made by connecting a small capacitor across the anode. Or a capacitor in series with a resistor or in series with a variable resistor. A technique used on electron tube vintage record players such as Dansette etc.
So a signal path can be:
Mic - Pleiades V6 with and added variable high cut at the anode - a microphone preamplifier
(Take all safety precautions even when working with battery operated equipment such as the electron tube V6). (If monitoring with headphones always reduce dramatically the volume before changes and listen to ordinary to soft levels).
This technique reminds preemphasis demphasis as used on magnetic analog tape recording, FM radio preemphasis etc.
It may create nice HF peak limiting and the waveform then becoming rounded by the high cut filtering action. Similar to the high cut filtering action of the guitar amplifier speaker.
A similar preemphasis demphasis technique must be used on the Neumann U67, see Stephen Paul article.
References:
Flat frequency response from singer's vocal chords to listener's brain, Sound Picture Recording and Reproducing Characteristics - Loye, Morgan - JSMPSE
https://www.mixonline.com/recording/vintage-microphones-part-2-neumann-m49-m50-u67-and-u87-377061
800A Optimod Manual - Orban
www.261.gr - music not sinewaves
Interview of Mike Oldfiled on how he creates his guitar sound
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