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Old 31st May 2018
  #19
Gear Maniac
 

Bear in mind that the new Core Sound OctoMic is more "1st order and a half" than true 2nd order. The insufficient number of caps makes it impossible to derive a complete set of 2nd order spherical harmonics.

Already in 1973, Michael Gerzon found that a dodecahedron of (12) cardioid caps was necessary to have a complete set of 2nd order spherical harmonics. His old partner in crime, Peter Craven, proposed other models of 2nd and 3rd order mics.

AES E-Library >> Periphony: With-Height Sound Reproduction This paper is 45 years old: the fact that AES still ask $33 for it is beyond me...

https://iaem.at/ambisonics/symposium...tialsphmic.pdf

Last edited by Kewl; 31st May 2018 at 09:29 PM..