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A Practical Ear Enclosure with Selectively Coupled Volume

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A practical circumaural ear enclosure is described in which improved low-frequency attenuation is provided by a Helmholtz absorber in the form of an added volume selectively coupled to the enclosure. Some acoustical and mechanical problems associated with selectively coupled volumes are discussed.

JAES Volume 15 Issue 3 pp. 295-298; July 1967
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AES - Audio Engineering Society