Acoustical design of diffusers in concert halls using scale models

A design process of diffusing surfaces has been verified by comparing with acoustic parameters in different scale models of a concert hall. A 1:50 scale model was used to determine locations of the diffusers as the main diffusing surfaces, and a 1:25 scale model was used to determine the structural height and density of the stage diffuser by examining the amount of diffusion on the stage. In addition, a 1:10 scale model was used to design the exact shapes of the diffusers by measuring the scattering and diffusion coefficients of them. The diffusers were installed on the concert hall stage and sidewalls of the auditorium; acoustic parameters, such as EDT, G, C80, and Np were measured to examine the amount of diffusion in the hall. As a result, the relative standard deviations of the parameters RT, EDT, and G decreased, whereas Np values increased. In the case of Np, the change was consistent with the variation of the diffusion amount. In conclusion, when designing a diffusing surface in a concert hall, the...