At your risk.
It may be done by using for example:
One XLR female to male barrel adaptor with an inductor L inside.
One XLR adaptor with Resistor R inside.
One XLR adaptor with Capacitor C inside.
Etc.
The difficult part is how to make to above work while XLR adaptors are connected one after the other wile Legos.
The difficulty arises from the fact that an R,L gentle slope Pleiades low cut filter requires R in series with L and the resultant in parallel or shunt to microphone's output.
Similarly an R,(L reactance - C reactance) Pleiades band attenuating filter requires R in series with L in series with C and the resultant connected across microphone's output. See for example the high frequency peak attenuating filter (or presence boost) inside a Shure SM7.
The difficulty can be overcome as follows:
Each XLR adaptor has pin 2 female connected to pin 2 male and pin 3 female connected to pin 3 male in the normal balanced signal pass way.
But pin 1 female is connected for example to inductor L and pin 1 male of same adaptor is connected to other end of said inductor L.
Similarly with other adaptors including other values of L, C, or R.
So by connecting for example 2 such XLR adaptor in tandem, (cascade or one after the other), an L can be connected in series with R.
Another XLR adaptor just after the mic and another just after the filter does the job of connecting such composite filter in parallel with signal line 2, 3 (live, return).
Suitable connections for this job are done on the male section of input XLR adaptor and female section of output XLR adaptor. All needed to be done is arranging that the series combined elements are connected in shunt with signal line 2, 3.
Female part of input XLR adaptor is normally connected as signal to pins 2, 3 and 1 connected to the metal part of adaptor.
Male part of output XLR adaptor is normally connected as signal to pins 2. 3 and 1 connected to the metal part of adaptor or chassis.
So XLR protocol is preserved and all 4 adaptors in said cascade combined modular example are compatible with any mic and mic preamplifier.
Various implementations of Pleiades R,L or LRC filters can be almost instantly implemented if an adequate supply of Pleiades L, Pleiades R, Pleiades C Neutrik modular XLR adaptors are available. Each can have its color central stripe code. All resultant filter combinations can aid the goal of flat frequency response from record producer's brain to listener's brain in a hopefully vast selection of microphones or recording environments.
How is it done?
Male of input XLR adaptor is connected pin 3 to pin 1.
Female of output XLR adaptor is connected pin 2 to pin 1.
L, R, or C adaptors as described above is each component from pin 1 to pin 1 of same adaptor.
All adaptors have connections from pin 2 to 2 and pin 3 to 3 of same adaptor.
Input of input adaptor and output of output adaptor are connected in the known industry way, pin 1 to metal part, and 2, 3 signal live, return, see Jensen transformers website pin 1 literature.
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