Median Plane

The name sometimes given to an imaginary line equidistant from two speakers in a left/right studio monitoring setup. If you draw an imaginary line between the center of each speaker and then draw another line of the same length from the middle of that line, but perpendicular to it toward the listening position, the spot where that second line terminates is where your head should be for optimal listening. That second line defines the median plane, effectively separating the listening space into left and right halves. This is another way of saying the listening position should form an equilateral triangle between the listener and the two speakers. This is where you will get the best phantom image in the center as well as the best recreation of the overall soundstage.