There seem to be 2 different approaches.
Mics that have acoustically implemented mid high rise. For example SM7, MD441. Then an L (in series with R or L winding resistance) in series with C for example on SM7 creates flat frequency response. It can be seen on Shure SM7 datasheet.
Other mics such as AKG D1000E seem to have a flat frequency response. Then an R is series with LC creates gentle mid high rise.
The above great filters are subtractive.
For example on the second everything but the mid high is gently and subtly reduced.
On the first example the broad mid high peak is reduced.
Pleiades inline filters operate on these principles. (R,LC) has not been much tried yet. Neither (R,L) cascaded to (R,C).
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