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A Graphic Method for Choosing and Aiming Loudspeakers for Reinforcement

A simple transparent template laid over an architectural plan drawing shows required angular coverage, loudspeaker aim angles, and variations of sound pressure level due to distance. Then, after a tentative choice of loudspeakers and aiming, the resulting relative sound pressure levels at various seats may be plotted quickly if the dispersion characteristics of the loudspeakers are known.

JAES Volume 34 Issue 4 pp. 269-277; April 1986
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AES - Audio Engineering Society