Predicting theatre chair absorption from reverberation chamber measurements

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TypeArticle
Journal titleJournal of the Acoustical Society of America
ISSN0001-4966
Volume91
Issue3
Pages15141524; # of pages: 11
SubjectAcoustics and Noise Control; Acoustics
AbstractThe sound absorption of small samples consisting of up to 18 upholstered theatre chairs was measured in a reverberation chamber and these results were related to the effect of larger samples of the same chairs in auditoria. The sound absorption coefficients of the chairs, measured in a reverberation chamber, were found to be linearly related to the ratios of perimeter to area of the sample of chairs. Extrapolating these reverberation chamber measurements to smaller perimeter to area ratios, characteristic of seating blocks in auditoria, produced good agreement with measurements of the same seats in the auditoria. This procedure is proposed as a more accurate approach to predicting the absorbing characteristics of upholstered theatre chairs in auditoria. Three other more approximate approaches were also considered including the use of screens to eliminate edge absorption, average sample size corrections, and the use of average absorption coefficients for all types of chairs. The merits of each approach are discussed and data are given for average sample size corrections.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierIRC-P-1765
NRC number33981
2400
NPARC number20386739
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Record identifierf6e2b103-aefd-43d2-aa85-02bb5f860a8f
Record created2012-07-25
Record modified2016-05-09
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