(term) XY

[audiokid]

XY creates a stereo image by using two cardioid or hyper cardioid microphones placed as near as possible to each other (and up to 12 inches apart) at 90-135 degrees spread and with the center of the spread pointed at the sound source.

 

[cyrano]

How can they be as close together as possible if they're up to 12" apart?