Evaluation of Acoustic Comfort in and Around High-School Classrooms in Jakarta

This work focuses on the evaluation of acoustical comfort in high-school classrooms through in-field measurements and selfreports. The acoustic quality of the classrooms have been analyzed based on measurements of the reverberation time, sound pressure level inside and outside the classrooms, and sound insulation. Measurements of ambient noise (external and internal) followed the Indonesian Standards SNI 7231-2009. . Measurement of reverberation time and sound insulation followed the international Standards ISO 140-4, ISO 140-5, ISO 717-1, and ISO 3382. Results (sound insulation and reverberation time) have been compared with reference values found in the Indonesian SNII 6368 and SNI 6629. Results reveal poor acoustical quality of the surveyed classrooms It was found that the acoustic environment of these high schools is not adequate. With open windows, the noise levels at both Private School classrooms and Public Scool classrooms are 62.3 dB for windows open and 60.6 db for windows closed. The average reverberation time and early decay time measured in five classrooms at frequencies 250 Hz, 500 Hz, 1000 Hz and 2000 Hz. . The sound insulation in classrooms calculated standard level difference DnT, w The calculated values are 27.7 dB for Private School classroom and 20.6 dB for Public School classrooms.