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1.8 seconds absorbing material Absorption coefficients absorption units Acceptable limits accuracy acoustic quality ARCHITECTURAL ACOUSTICS balcony calculation cause coffering compromise consideration covered cubic feet curved walls DEAD SPOTS dimensions echo empty room ence Excessive reverberation existing auditoriums explained later floor formula frequency full audience hair Half audi half audience heard inaudibility incident sound Inst interior finish irregular large auditorium loud Maximum audience necessary note of music number open window orchestral ordinary panel path perhaps PLANNING AN AUDITORIUM Plaster ceiling Plaster walls produced prolongation proscenium arch quantity rarefaction ratio rectangular reduce the reverberation reflected back reflected sound regular reflectors room in cubic Sabine Sabine's Seat cushions smooth sound foci sound intensity sound pictures Sound-absorbing materials speaking or musical spots and sound square feet Stage opening surfaces syllable or note Table theater tion total absorption upholstered upper limit verberation voice Volume of room wall or ceiling Watson wave length Wood Wooden seats