[Sursound] Why do you invert the phase of one channel of multi capsule microphones ?

[Augustine Leudar]

Hello all,
I am building a six capsule ambisonic microphone. I have been told
that with the opposite capsules (ie up/down, left/right,
forward/backwards) I should invert the phase of one of the channels
and then add them to get the X,Y,Z for the ambisonic b format. I've
been struggling to find a good explanation -  I was wondering if
anyone could explain why this is in detail ?
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