The study of resonator-diffuser acoustics performance using PVC pipe

A preliminary study of a resonator panel and diffuser using polyvinyl carbonate (PVC). The resonator and diffuser parameters of the panels are tested in the chamber reverberation chamber and anechoic chambers in the laboratory of acoustic physics, the physics department of FIA ITS. The resonator parameter tested is in the anechoic chamber by looking spectral for SPL differences when without and the panel existed. As a diffuser, scattering patterns are tested in the anechoic chamber, while scattering coefficients (S) at a reverberation chamber. In this paper, the panel of resonators in the test made from pipes of 0.5″, 1″ and 3/2″ diameters with panel sizes are 60 cm x 60 cm. base on measurement, the panel has a resonance frequency at 540 Hz. While as a diffuser, the scattering coefficient (S) value for a small pipe is 0.98 at a frequency of 125 Hz with an angle of 0o, a medium pipe is 0.99 at a frequency of 500 Hz with an angle of 30°, a large pipe is 0.93 at a frequency of 500 Hz with Angle 0°. (paper)