Acoustic space absorber unit

摘要

An acoustic space absorber unit is provided in which Helmholtz resonators are mounted within an enclosure composed of sound absorbing material, with the orifices of the resonators near to but spaced from the enclosing material. The Helmholtz resonators are tuned to low audible frequencies such as 125 Hz. The Helmholtz resonators enhance the sound absorption at low frequencies while the entire unit provides sound absorption throughout the entire audible range.