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.
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