The tolerance that may be allowed in the computed reverberation time in audience rooms without producing appreciable difference in the acoustic properties, either as shown by the change in the intelligibility of speech or in the quality of music is considerable, certainly as great as 5 per cent of its value. Add to this the fact that in most practical cases ¾OL. =Zoo, ooo CU. •T. Curw l.--Untrcated Curve 2.'-•re•ted with 3ZOO a•.Ft. at .•0 -Cu• 3.--Tr•a•ed with 3•00 •q. Ft. at .TO ,
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