When measuring the response of a loudspeaker by averaging multiple points in a room, the results typically vary according to the number of microphones employed and their positions. This report focuses on the application to cinema calibration, where one critical goal is to achieve consistent perceived loudness and frequency response between dubbing stages, where content is produced, and the various theaters where it is exhibited. It is shown that averaging converges to a compromise response over the relevant listening area at a rate inverse to the square root of the number of microphones employed. Experimental results confirm the predicted scaling of the deviations, and quantify their magnitude in typical rooms.
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