The new version of Pleiades filter is an inductor in series with a resistor. So it is a more general case. When R=0Ω ie no resistor we have just an inductor.
The passive filter is connected to the output of a bass instrument. L together with the output impedance of the instrument dictate the high pass or low cut frequency, R adjusts the slope. It can be a variable resistor. No makeup gain is needed. The wave filter removes what is not wanted.
For example if a bass guitar or an electronic bass synth etc sounds dull, with no treble detail, muddy, undefined to listener's brain, by removing the unwanted bass heaviness the overall sound may become a clear and deep bass with mid and treble detail.
Inductors can be easily wound on toroidal tape wound cores which suffer no magnetic pickup noise as the magnetic field is contained inside the ring.
Mu metal, nanoperm (nanocrystaline), moly permalloy, supermalloy etc tape wound cores can be used.
Pleiades filters can be also used directly connected to a microphone output. Be careful,in case some active microphones may not accept the load. They operate greatly directly connected to moving coil or ribbon microphones.
The schematic of the Pleiades filter is in the next euroecrron post:
http://euroelectron.blogspot.gr/2018/05/improved-pleiades-filter-schematic.html
The objective is helping in creating the right sound with minimal signal path. Flat frequency response from producer's brain to listener's brain.
A similar fikter may be used for high cut. It may consist of a capacitor in series with a variable resistor and the total in shunt or parallel with the signal source output.
Reference:
Flat frequency response from brain to brain, Sound Picture Recording and Reproducing Characteristics - Lowe and Morgan - J.S.M.P.E.
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