The Neumann M50 is possibly one the best microphones ever made.
It is mentioned in an interview of Al Schmitt.
The Grampian DP4 is also omnidirectional.
A desirable version of M50 has a metal diaphragm. So does DP4.
They both have a significant rise in frequency response above 2KHz.
Stephen Paul explains this is important as the high frequencies are absorbed by air. This should be significant when recording a large orchestra in a big room.
If a stepup transformer and electron tube head amplifier such as Pleiades V6 is connected to DP4 they have another thing in common. A very low noise, simple and great sounding front end amplifier. The Pleiades V6 is operated by batteries and the schematic as anything else Pleiadss is open source.
Why omnis? Although not as popular omnidirectional microphones are sounding great and for close vocals too. For example Karen Carpenter recording with a U87 stuck to omnidirectional pattern. Close to you.
The absorption of HF due to air molecules and the difference in diffuse sound field response compared to free field are 2 different phenomena.
References:
Neumann M50 frequency response
Grampian DP4 Technical Data
https://martinmitchellsmicrophones.files.wordpress.com/2016/09/grampian-dp4-page-3.jpg
Neumann M50 schematic
Pleiades V6 schematic
https://m.youtube.com/watch?v=4eFneKlvlLQ
https://www.mixonline.com/recording/vintage-microphones-part-2-neumann-m49-m50-u67-and-u87-377061
https://www.gearslutz.com/board/so-much-gear-so-little-time/518947-anyone-use-omni-mics-vocals.html
http://recordinghacks.com/microphones/Neumann/M-50
Microphones - Boré, Peus - Neumann
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