The Effect of Orchestra Pit Diffusion on the Auditorium Acoustics of Opera House

A scale model of the Zhuhai Opera House, with 7 kinds of simulated orchestra pits, was made and analyzed in an experiment. The pulse response of the auditorium of the opera house was measured and analyzed. The results show that diffusion treatments for the orchestra pit can affect the sound transmission of stage source, increasing C80 and D50 in the rear part of the auditorium and can also affect the sound transmission of pit source, making the average value of G in the auditorium rise. As well, no significant changes were found on EDT and T20 under the diffusion treatment of the orchestra pit.