Winding 110 turns on Siemens Epcos small toroid

At your risk! It is the largest from the very small sizes that can fit inside an XLR female to male adaptor. Enameled wire used is of diameter 0.16mm. 100 turns give inductance of 20mH, 110 turns give inductance of 25mH. It is to be used for a Pleiades (58ohm,25mH) inline microphone EQ (bass, mid correction filter). It reduces bass, mid frequency content in a gentle slope so that a singing voice sounds without bass, mid exageration. So tghe high frequency sparcle is retained and not masked. It is supposed to simulate in an analog but perhaps simpler way the Cinema Eng. 4031-B program ewqualizer at setting:-12dB at 100Hz, +2dB or 4dB at 10KHz. It is to be used connected directly to microphone as there is no insertion loss. 58ohms will be split in 2 ie 2 resistors of 29ohm or 28 ohm will be connected in series to inductor on each side of it for balanced symetry. The total is connected in parallel with microphone ie at pins 2,3 of XLR input. XLR input pins 2,3 are connected with XLR out pins 2,3 so that the EQed mic signal passes. Neutrik XLR modules are to be used, mid module strip color may be orange.