First let's answer the question why should a Pleiades (R,L) filter be better connected just after the mic output?
If muddy sound gets into the preamplifier it may be difficult to get it out. Everything in nature is non linear, non linearity means inter modulation of frequency components sent.
Why not just using a mic with a flat frequency response?
It will most likely sound non flat (bass heavy at least) to our brain. A flat mic can be a good start and then correct for listener's brain by a Pleiades (R,L) gentle slope high pass filter.
Why a flat mic will not sound flat frequency response to our brain?
It could be more than 4 reasons...
1 proximity bass boost effect
2 equal loudness curves (a higher intensity sound at reproduction sounds bass or treble heavy to our brain)
3 voice effort curves (an effortless, soft singing voice has a frequency spectrum like a bathtub curve, high bass, low mid, high HF)
4 room bass boomy acoustics if for example (membrane sound coverting to heat absorbers) are not used
What is the objective of production reproduction?
Possibly flat frequency response from producer's brain to listener's brain rather than from just mic to loudspeaker.
Further reading:
Sound Picture Recording and Reproducing Characteristics - D. P. Lowe, K. F. Morgan - Journal of the Society of Motion Picture Engineers - Hollywood
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