THE EXPERIMENTS OF ACOUSTIC MODEL FOR HANGZHOU THEATRE

The Hangzhou Theatre is a multipurpose auditorium having a seating capacity of 2,000 and a volume of about 10,000 m³. Completed in Sept. 1978, it is general agreed that the acoustics of the auditorium is good. In the course of designing the acoustics, we proceeded experiment with acoustical model of scale 1:10 in order to make an initial evaluation for the design.This paper gives comprehensively some experimental results and compares it with the actual measurements in the theatre after completion. The experiments of model consist of (1) the acoustical characteristics of screen slat strueture and the boat-diffuser on the ceiling, (2) the simulation of absorptive materials, (3) the reverberation time, (4) the reflected sound, (5) the distribution of sound field, (6) the effect of early reflective sound for audience, (7) the directional diffusion, (8) the definition, (9) the subjective assessment. The results of model compare with aetual hall:except 250 Hz (difference about 20%), the reverberation time (occupied) at various frequency were close(difference less than 10%); the difference of sound field distribution less than 2 dB; the early-reflected sound from side walls of proscenium over audience attenuated about 6 dB; the value of directional diffusion less than actual measurements, because we neglected the details while making the model; the definition and subjective assessment agreed well.