Signal path, setup:
male voice singing (The Power of Love - FGTH) on F minor - Shure Unidyne III - Pleiades air toroid (R,L) filter - Sony TC-D5 Pro - Sennheiser HD 580
Firstly the gentle slope Pleiades (R,L) filter was connected on its own to Sony's mic input in order to access hum, buzz pickup. Both existed but they were low. Changing toroidal coil orientation almost nulled them.
And of course when the low Z mic is connected whatever buzz may be remaining, disappears.
Sound is very nice and natural.
Firstly tye 4000 turns winding was connected across mic output with alligator cable clips. Sound is very bright.
Then tye 12000 turns winding was connected. The sound is natural to listener's brain. When disconnecting or removing coil from circuit bass and mid heaviness return.
As mentioned the 4000 turns sound very bright. And there is some harshness to sound. So does perhaps Pet Sounds - Beach Boys sounds, Nrian Wilson using a Unjdyne III for his vocals.
Connection as a 1:3 booster transformer before input transformer has not been tried yet.
Conclusion: It sounds like unwanted bass, mid heaviness are removed while leaving the rest frequency spectrum unchanged.
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