Hasbullah Panggabean, Selamat Triono, S. Sukardi, Muhammad Iqbal Siregar, A. Abdillah, W. Warman, Dicky Nofriansyah, Ansari Saleh Ahmar, Robbi Rahim
This research is directed to sound absorption performance test on single-reflex bandpass type speaker box from a fiber of Areca Nut with polyurethane and gypsum matrix. The variables of this study change the frequency into 3 types namely, 125, 250 and 500 Hz and then modify the sound pressure into 10 types, namely, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000 and 16000 Hz. The preparation of the research material begins with a cutting of the areca nut, splitting, drying, picking fiber, chopping, and blending, sieving, making 3 types of sheet-shaped, mixing polyurethane with gypsum and printing specimens. Preparation of research materials in the form of box specimen type single reflex bandpass which is then tested with the method of buzz and sound pressure (SPL). While the value of voice pressure (SPL) circularly on the axis X, Y and Z obtained the highest average value 57 dB on the Y3 axis and the lowest average value of 51.59 dB on the X2 axis. © Published under licence by IOP Publishing Ltd.
Department of Material and Engineering, Politeknik Teknologi Kimia Industri, Medan, Indonesia; Universitas Negeri Medan, Medan, Indonesia; Faculty of Computer Science, Universitas Negeri Padang, Padang, Indonesia; Faculty of Engineering, Universitas Negeri Padang, Padang, Indonesia; Department of Information System, STMIK Triguna Dharma, Medan, Indonesia; Department of Statistics, Universitas Negeri Makassar, Makassar, Indonesia; School of Computer and Communication Engineering, Universiti Malaysia Perlis, Malaysia
