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Effect of Microphone Number and Positioning on the Average of Frequency Responses in Cinema Calibration

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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. We present an interpretation of the average procedure that shows 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. We then provide real-world examples by performing measurements in a dubbing stage and a cinema theater, and analyzing the variations of average frequency responses over a large set of different microphone number and positioning. Results confirm the predicted scaling of the deviations and quantify their magnitude in typical rooms. The data provided helped to establish the point of diminishing returns in number of microphones.

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AES - Audio Engineering Society