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

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.