In situ test: acoustic performance of eco-absorber panel based albizia wood and sugar palm fiber on meeting room in UNS Inn Hotel

Elimination of echoto improve sound quality is essential term of comfortable function room. This study aims to investigate the enhancing of acoustic quality of a meeting room using eco-absorber panel based sugar palm fiber in UNS Inn Hotel, Surakarta, Indonesia. The panel was made from albizzia wood with sugar palm fiber as acoustic fill covered by sponge and Regency fabric. The reverberation time calculated with theoritical method was to validate thatmeasured with in situ test. The testing was performed using an impulse method by recording handclap sound, and the data was processed using MATLAB software to determine the reverberation time value. The testing of sound pressure level and sound distribution were conducted with two loud speakers placed in front ofthe room for frequency of 250 Hz. The sound pressure was measured at each measurement point using sound level meter. The absorber panels were installed on the back wall of the room varied in 100%, 75%, 50% and 0% of the wall sectional area. The result shows that the increase of installed absorber panels decreases the reverberation time value and it has good correlation with theoritical calculation. According to the test results of sound pressure level and sound distribution, the lowest reverberation time is achieved for 100% of installed absorber panel. The reduction of sound pressure level and sound distribution are up to 18.3 dB and 40-60 dB, respectively.