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ACOUSTICS 93
for the floors of chambers requiring correction. Even the materials used for scenery are being given special attention, to secure ideal acoustical conditions; for the problem here is the elimination of unwanted reverberation by any and every means. All who have the problem to deal with realize that the highest degree of perfection is needed. Therefore, engineer and scientists are continually searching for better methods. The experience gained in broadcasting over the radio has in this way been of great benefit in solving the problem of the motion picture sound stage.
Of course, it is the particular task of the producer continually to improve and refine studios and recording apparatus to capture the last measure of tone quality and of delicate moods of expression. Yet much of this improvement will be of no value if the reproduced sound is distorted in the theatre by faulty conditions. Although the study of acoustics is of a highly technical nature, and although much of the success to be attained must necessarily be the contribution of experts, nevertheless, the various factors pertaining to the problem ought to be a matter of common knowledge, so that all who are concerned may realize the importance of the subject and the possibilities of control.
The reproduction of sound occurs generally in large auditoriums where hundreds or thousands of persons may be accommodated. The ideal is to fill the room equally with faithful sound so that each person can hear well. The degree of fidelity with which the sound is reproduced will depend to a great extent on the acoustics of the theatre itself. Keep this in mind: The acoustical condition of a theatre cannot add anything to, or improve on, the original recorded sound.
The acoustics of a theatre depend upon three factors: the size, the shape, and the materials comprising the interior finish. In order to understand the effect of these