Acoustical Design of the Los Angeles Pavilion

Abstract

The acoustical design stressed a balance between clarity, envelopment, and reverberance. Both acoustical and optical modeling were used to verify the design advice given to the architects. The hall is multipurpose, wide fanshaped, seats 3250 persons. A versatile, movable, orchestra enclosure is used to convert to an orchestra hall and the stage is terraced to optimize sound projection and orchestral balance. Classical music does not need electroacoustic sound reinforcement; however, it was stressed that reinforcement would be required for light opera and stage plays. The absorption versus frequency of the auditorium seats was specified. Elaborate precautions were taken to exclude city noises and noise from mechanical and plumbing equipment. A permanent, but movable, acoustical canopy projects outward from the proscenium arch to enhance clarity. The side-wall shapes are designed to promote early sideward reflections for envelopment. The reverberation time is adjustable between nominal values of 1.6–2.5 sec. Performers approve the playing ease and musicians and critics comment favorably, with reservations that emphasize the challenges of the future.