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Intensity Measurements of the Acoustic Emission from a DML Panel

An experimental investigation is reported into the effects of a porous layer on the radiated sound intensity from distributed mode loudspeakers (DMLs). For an unbaffled panel, the results suggest that attaching an absorbent layer behind the panel leads to a smoothing of the spectra of sound intensity. When a specially developed enclosure was used, an improvement in the low frequency response of DML panel was observed. The inclusion of a porous layer in this enclosure further reduced the fluctuations of the emitted sound spectra, and smoothed the resonance peaks in the low frequency range.

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