A variable passive low-frequency absorber

Niels Werner Larsen (Invited author), Eric Robert Thompson (Invited author), Anders Gade (Invited author)

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    Multi-purpose concert halls face a dilemma. They can host classical music concerts, rock concerts and spoken word performances in a matter of a short period. These different performance types require significantly different acoustic conditions in order to provide the best sound quality to both the performers and the audience. A recommended reverberation time for classical music may be in the range of 1.5–2 s for empty halls, where rock music sounds best with a reverberation time around 0.8-1 s. Modern rhythmic music often contains high levels of sound energy in the low frequency bands but still requires a high definition for good sound quality. Ideally, the absorption of the hall should be adjustable in all frequency bands in order to provide good sound quality for all types of performances. The mid and high frequency absorption is easily regulated, but adjusting the low-frequency absorption has typically been too expensive or requires too much space to be practical for multi-purpose halls. Measurements were made on a variable low-frequency absorber to develop a practical solution to the dilemma. The paper will present the results of the measurements as well as a possible design.
    Original languageEnglish
    Title of host publicationThe Journal of the Acoustical Society of America
    PublisherAcoustical Society of America
    Publication date2005
    Publication statusPublished - 2005
    EventJournal of the Acoustical Society of America -
    Duration: 1 Jan 2005 → …


    ConferenceJournal of the Acoustical Society of America
    Period01/01/2005 → …

    Bibliographical note

    Copyright (2005) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.


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