Critical listening,…
When you go to an acoustic chamber music concert, and have full run of the room for recording. You run three different stereo recordings from different depths, and you analyze it to the 'enth degree, to find the sweet spot in the hall. You then take what you learn, and improve on your techniques, and then sit back and listen to endless hours of new recordings of the same ensemble/same room, different techniques.
You learn to listen so well that you can actually hear the difference in turning the mics outward from each other by 5º apiece makes (or perhaps more towards straight on axis), as it encompasses the ensemble better, or adds some ambiance magic from the room, etc.
You do this for hundreds or thousands of performances, over decades, and assess each one critically. You can get a well developed critical listening skill this way.