Can you recommend a good explanation of the different types, how they are recorded encoded etc.? From a naive sonar perspective it seems like two mics one on each side of a head sized camera would do fine for encoding all the angle information. But then you would have to register and apply that knowledge to each boom mic input, and synthesize it for every sound effect that wasn't there at recording. Tl;dr Why isnt two channels enough to generate the correct output for N speakers spread around me?