Study of the Effect of Splaying Wall to Modify Acoustic Modes Distribution in Small Room

Abstract

Modes are known as ones of the important acoustical issues in small room. These phenomena could drastically change the spectral and temporal characteristic of sound. Studies have been done in optimizing rectangular room dimension, optimizing source and listener position, and optimizing low frequency with acoustic panel. To follow the best room ratio, a built room has to be cut a lot. This paper is studied the effect of splaying wall in attempt to shift the modes without trimming too much space. Axial room modes from different room ratios - including random, splay wall, Bolt, Louden, Cox - were calculated and compared. Low frequency characteristic of small rooms were observed aided by FEM simulation so that SPL result could be graph and statistically analyzed. It was found that splaying some walls from the random room dimension could distribute the modes evenly, similar with Cox', though the SPL standard deviation was raised. Further research will be continued through psychoacoustic evaluation.