Room acoustic simulation tools are widely used to predict the acoustic performances of indoor spaces, and they have become a predominant method of acoustic design since 1988. New algorithms have been adopted to operate the acoustic modeling programs after ray-tracing method was used at first. Accuracy and applicability to various spaces of these programs have been improved based on the commercial potential.

The present study aims to investigate the acoustical results from various room acoustic simulation software which are currently used as acoustic modeling programs. In order to this, round robin tests were undertaken using four acoustic simulation software. Room acoustic parameters of a simple classroom were measured including SPL, RT30, D50, C80, EDT, LF and STI. Also, room acoustic modeling was undertaken in the classroom using four different room acoustic simulation software, and the modeling results were compared with the measured values.

As a result, it was shown that most of the room acoustic results are similar. However, different results were drawn at the low frequency regions between the geometrical acoustic modeling and hybrid modeling which uses wave propagation analysis.