some countries have standards for stereo microphone placement, and if you violate these national policies you lose your job! there is NOS (Germany), RAI (Italy), some others probably, and then there is ORTF (France). Every taper in the world seems to prefer this calculable re-creation of the French airwaves.
while Alan Blumlein recommended only near-coincident techniques, here Michael Williams explores stereo pairs with alternative spacing and angles, presented at the 75th convention of the Audio Engineering Society at
Nogent-sur-Marne, France 1984-03-27 -- 1984-30-30
https://microphone-data.com/media/fi...%20zoom-10.pdf
at Michael's retro 90s site you can still download many AES white papers free without the usual paywall. these are 'retro' 80s versions, made on a typewriter with hand-drawn graphs then copied on a machine that stinks of chemicals, including 'the stereoscopic zoom' first print. the upper-right link contains a nice online general purpose guide to stereo microphone theory. following Michael's advice you can hook up way too many microphones and get the mathematics straight.
http://www.mmad.info/
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