Maybe it's helpful to explain the different configurations and how I named them:
XY means a 90° stereo coincident array with two microphones of same directional characteristic:
-Ca is cardioid
-Om is omnidirectional*
-WiCa is wide cardioid
-CaLo is the low position of cardioid selector
-HyCa is hyper-cardioid
-Fig8 is figure eight**.
*Remark: theoretically a xy with two omnis is no stereo at all but rather a mono omni, but in practice, because the capsules aren't at exactly same spot and because of their frequency-dependent sensitivity there is some spaciousness.
**Remark: a XY array with two figure eights is known as Blumlein array.
MS means mid side. One capsule is always a figure eight and the other permutates through all the possibilities of the mic. The M capsule, which is the one which can have different characteristics, is pointing to the player and the other is perpendicular to it and points to the right side as seen from the listeners perspective. The output of the microphone needs to be 'matrixed' to win the left-right stereo signal. This can be done in hardware or software.
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