Once propagated in air, low frequency energy can be difficult to attenuate without physically prominent bass absorbers. The tunable diaphragmatic bass absorber fulfills this task in a discrete way. Mounted on an aluminum frame, a tunable membrane is separated by a thin air-gap to a layer of acoustic fiberglass. The membrane's excitation is restricted by the layer of acoustic fiberglass resulting in attenuation of a desired range of low frequencies. The proposed use for this new design is to attenuate a particular LF room mode or its harmonic.

Author: Jeansonne, Philippe
Affiliations: McGill University, Montreal, QC, Canada; Centre for Interdisciplinary Research in Music Media and Technology (CIRMMT), Montreal, QC, Canada(See document for exact affiliation information.)
AES Convention: 136 (April 2014) eBrief:152
Publication Date: April 25, 2014

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