Evaluation of Acoustic parameters at the ITS Science Tower Auditorium as a Multi-function Room

Abstract

Acoustic parameters of a room affect the information received by listeners. Several acoustic parameters need to be met so that the information conveyed in a room can be clearly understood by listeners. The acoustic parameters include background noise, SPL distribution, reverberation time (RT), Clarity (C₈₀, C₅₀), and Definition (D₅₀). This paper discusses the evaluation of acoustics parameters in the ITS science tower auditorium. The auditorium has a square shape with a volume of 3,387 m³. The evaluation was carried out using the impulse response method in an unoccupied auditorium without a chair. Based on the measurement results when unoccupied without a chair, It was found 27-31.6 dB, 64.5-76.5 dBA, 3.3-4 s, -5 to 1 dB and 8-40% for background noise, SPL, RT, C80 and D50 at the frequency of 1000 Hz, respectively. This shows that the auditorium does not yet fulfill a multi-function room. Consequently it is necessary to improve acoustic conditions through simulations with the addition of chairs, people, and loudspeakers. The simulation results in the auditorium obtained SPL of 78.32-94.2 dBA, RT of 0.95s, and an average of C₈₀ of 4.01 dB, which indicates that the auditorium is closer to a multi-function room than before.