Abstract
The new Seattle Opera House is a multipurpose auditorium having a sealing capacity of 3100, a volume of 778 000 ft3, and a nominal reverberation time of 2.0 sec. The acoustical properties of the hall have won approval for a wide variety of performances. Interesting features of the hall include wall louvers to adjust the reverberation time and a fully adjustable, movable orchestra enclosure. The paper describes the acoustical performance in terms of the acoustical features integrated in architectural design. The achievement of clarity with reverberance is especially stressed, also the verification of structural absorption and correction of faulty seat-absorption versus frequency characteristics. The use of acoustical modeling is stressed in the achievement of sound projection over the audience surface and under balconies, as well as for the avoidance of echoes. The economic efficiency of maximizing reverberation as a function of volume is illustrated.
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