Flat frequency response from producer's brain to listener's brain with 2 omni microphones and no need of Pleiades filter

This was realized by chance while listening again to an older recording of male vocal. A demo of the song Πως Θα Ηταν.


Signal path:


Male vocal close to one M55 mic
                                                        - Uher 4200 report - Basf SM911 - Uher 4200 playback
Yamaha PSS-14 close to other M55 mic


Note that listening is by one speaker, the internal Uher fullrange one.


The voice sounds bright and not bass heavy. Yet when pressing the single track button on Uher the voice becames very bass heavy. When sending both tracks to speaker sound quality is back to very nice and bright, like a commercial pop recording on radio.


What is happening? It might have been mentioned on previous posts.


Both mics are terminated to 5pin DIN connectors. One of the mics happens to be connected out of phase with respect to the other mic.


So a noise canceling mic combination occurs and one sings closer to one of the mics. Otherwise there would be no voice too. The effect is beautifully described by Lou Burroughs, Electro-Voice on his book. [Burrougs]


The bass cut (which can be adjusted by distance of 2 mics) compensates for Fletcher Munson, voice effort curves, room boominess etc. [Hilliard]


Both mics receive nearly the same background noise. And since they are out of phase noise cancels too.


So 2 good things out of 1.



References:



Microphones - Lou Burroughs


A brief history or early motion picture sound recording and reproducing practices - John F. Hilliard - JAES vol33 no4 April 1985 - page 274
http://www.aes.org/aeshc/pdf/hilliard_a-brief-history-of-early-motion-picture-sound.pdf