On 2013-04-20, David Pickett wrote:
But... How close to the theoretical A format polar diagramy are the XYZ components of the Soundfield (or Tetramic) microphone at frequencies above those at which they are essentially coincident?
Rather far from them, because the ideal A format response is a) a mixture of pressure and velocity and b) not even a 1-1 mix for a cardioid. However, they are essentially perfect representations of the true XYZ velocities (ideal B-format) to about 10kHz, where the 3.3cm wavelength approaches the mic diameter. So, pretty darn good, considering, and even beyond that at least the intensity response stays controlled. Well implemented the classical tetrahedral design is an outstanding realization of the theory.
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