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THEATRE ACOUSTIC RECOMMENDATIONS
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high-volume, low air-velocity type with air ducts provided with acoustic baffles.
Long, narrow auditoriums, high ceilings, excessively long and narrow balcony overhangs, concave focusing surfaces, and large unbroken reflecting areas should always be avoided, as acoustical faults will always result from their use.
If these Recommendations are followed, the resulting auditorium will give sound (as reproduced on a modern two-way equipment) with high intelligibility, warm, natural screen presence, good balance between high and low frequencies, uniform loudness level throughout the auditorium and the proper relative balance between high level music passages and low level, intimate dialogue scenes.
REFERENCES
^'Some Aspects of the Theories of Acoustics": Phillip M. Morris, Journal of the Acoustical Society of America, Vol. XI, No. 1, July 1939.
""Normal Modes of Vibration in Room Acoustics": Richard Bolt, Journal of the Acoustical Society of America, Vol. XI, No. 2, October 1939.
""Some Practical Aspects of Architectural Acoustics": Verne O. Knudsen, Journal of Acoustical Society of America, Vol. XI, No. 4, April 1940.
4"The Control of Sound in Theatres and Preview Rooms": C. C. Potwin, Journal of the Society of Motion Picture Engineers, Vol. XXXV, August 1940.
5"The Theatre Standardization Activities of the
Academy Research Council": Academy Research Council Technical Bulletin, May 22, 1940.
'""Theatre Acoustics Today": C. C. Potwin. Better Theatres Magazine, May 29 to October 16, 193-.
T"Motion Picture Theatre Developments": M. Rettinger, Journal of the Societv of Motion Picture Engineers, Vol. XXXIV, May 1940.
S"A Modern Concept of Acoustical Design": C. C. Potwin and J. P. Maxrield, Journal of the Acoustical Society of America, Vol. XI, No. 1, July 1939
°"Fundamentals of Theatre Acoustics": J. E. Volkmann and K. C. Morrical, International Projectionist, Vol. XV, No. 5, May 1940.