This is done by connecting a resistor in series with the inductor.
The resultant electrical network is connected to pins 2,3 (live, return) id est in parallel with the microphone's output.
So much gentler low cut slopes than 6dB per octave can be created.
It is a joy to connect a variable resistor and adjusting for the right body to be added to a male voice for example just before bass heaviness due to proximity effect and psycho acoustic effects.
The current limiting effect of the series resistor helps the inductor possibly preventing from saturation.
It also seems older cores with less inductance index had the advantage of needing many turns of thin wire therefore the series effective resistance may had been implemented in the coil itself.
On an initial test with the AKG D1000 (in bass or b unfiltered position) the following values were found to give very promising results.
105Ω, 53.5mH(600Hz turnover on 200Ω mics)
Signal path, setup:
Male voice at 1in-3in - AKG D1000 E - Pleiades V6 with 1:10, 140mH input transformer - Sony TC-D5 Pro - Sennheiser HD 580
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