to reduce the bass, mid heaviness (as perceived by the brain of the listener) of a mic passively, directly or right at the output of the mic.
This is subtractive EQing or wave filtering.
The Pleiades (R,L) filter is an example of a gentle slope high pass filter.
It consists of just a resitor (for slope) and inductor (for turnover frequency) in series. The total is connected across pins 2.3 of mic or mic preamplifier input.
A Pleiades filter can also be implemented inside an XLR female to male barrel adaptor made for example with the nice Neutrik XLR modules.
A color stripe on the central Neutrik module can differentiate one Pleiades filter from another. See previous posts.
Pleiades filters should be able be used with any mic type. And they also pass phantom power.
They are open source as everything Pleiades.
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