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Ground Plane Acoustic Measurement of Loudspeaker Systems

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Elaborate electronic techniques or specially constructed environments are usually required to measure only the direct field form a loudspeaker without contamination from reflected signals. By placing the measurement object on a flat, rigid, unobstructed ground surface, and placing the measurement microphone flush with the ground, an accurate simulation of the anechoic response of the object together with its image source may be obtained.

JAES Volume 30 Issue 10 pp. 723-731; October 1982
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AES - Audio Engineering Society