Pleiades (R,L) filter for 600Ω impedance microphones

Higher Z microphones if they need a Pleiades filter the R,L values must naturally be higher for the same effect. Otherwise the effect is too strong and the mic sound perception is strong in high frequency content.


Examples:


Fostex M80RP 600Ω
A suitable Pleiades filter: (410Ω,160mH) or for example (610Ω,160Ω), typical mic mouth distance 14in.
Tested on male singing voice.


Beyer M55 600Ω version
examples of suitable Pleiades filters:
(410Ω,160mH)
(610Ω,160mH)
(410Ω,80mH)
(410Ω,40mH)
(610Ω,120mH)


Revox 3500
(610Ω,120mH)