Abstract
The level of the direct (source to listener) sound in auditoria may be influenced considerably by attenuation owing to the audience. The analysis of echo effects, in particular, may be seriously in error if no allowance is made for the attenuation of the direct sound relative to the reflected. Measurements of the attenuation, using a one-fifth scale model of a seated audience in an anechoic space, have been made at several frequencies and with several heights of the source above the plane of the audience. The results are in reasonable agreement with those reported in 1934 by Bekesy for an actual audience; but the present results cover a wider range of conditions met in practice and they are systematized for engineering application
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