Monday, April 18, 2016

AKG D190

An amazing microphone.


The good thing about it is that it is flat.


So once the low mid mud from the proximity effect is out with a Pleiades filter, one is not left with 7KHz etc peaks exposed.


With singing tests, very low shunt Pleiades Low Cut filter inductance was found suitable. L of as small as 30mH and even less (1 KHz cutoff and even more) did a great job at removing the proximity effect at < 1in. This is to be expected if one sees the frequency response of directional microphones start rising below 1KHz at a very small distance.


Set up:


AKG D190 - Pleiades filter 983Hz - Pleiades V5 - Realistic disco mixer mic in - HD580


The Pleiades 983Hz was made of 53.5mH in // with 82mH. The input inductance of V5 (the inductance of the primary of its input transformer) 47mH. So effectively the mic was loaded by 82mH // 53.5mH // 47mH. This makes a total inductance of less than 30mH ie a cutoff of more than 1KHz. (These calculations assume a 200 Ohm microphone output impedance).

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