None of the present microphone systems use for stereophonic sound recording (X/Y, A/B-ORTF-NOS, etc) can be considered as universal or rarely even optimum. This paper shows how these different systems are in fact part of a much larger continuous field, where recording angle (in the horizontal plane and for various elevations) and geometric distortion of the sound field are related to angle and distance between microphones. The limits of our choice in this continuous field are shown to be determined by an unacceptable ratio of direct to reverberant sound.
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