200 turns on the black ferrite Siemens Epcos core that just fits inside an XLR male to female barrel produced an inductance of 86mH. The insulated enameled wire diameter was 0.1mm and filled almost one complete layer.
This can be just about right for using in parallel with an AKG D112 for great vocals at 4in (bass proximity compensation) or in other words passive eqing. So the inductor is just connected to pins 2 and 3 inside the barrel and everything is nice and balanced.
On a Magnetec 073 core much less turns are needed for the same inductance.
The wire resistance should play a part too as it will shelve out the bass reduction at some low turnover frequency. (The coil reactance at 0Hz is 0ohms but we are left with the resistance of the wire).
Apparently a variable resistance is used in series with an inductor and the whole lot in parallel with the mic output on the Sennheiser MD421 to give variable bass cut slopes.
This can be just about right for using in parallel with an AKG D112 for great vocals at 4in (bass proximity compensation) or in other words passive eqing. So the inductor is just connected to pins 2 and 3 inside the barrel and everything is nice and balanced.
On a Magnetec 073 core much less turns are needed for the same inductance.
The wire resistance should play a part too as it will shelve out the bass reduction at some low turnover frequency. (The coil reactance at 0Hz is 0ohms but we are left with the resistance of the wire).
Apparently a variable resistance is used in series with an inductor and the whole lot in parallel with the mic output on the Sennheiser MD421 to give variable bass cut slopes.
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