Abstract
During the renovation of an 1890s Victorian building, the author’s high ceiling office became entirely empty, the rectilinear boundaries consisting of wood, plaster, and glass surfaces. With a volume of 86 m3 (3030 ft3) the empty room had reverberation times (RT) ranging from 1 sec at low frequencies to over 2-1/2 sec at high frequencies. Boundary absorption coefficients were derived from RT data for the empty room’s surfaces with the greatest absorption occurring in the 125-Hz octave band. Two different (weight) carpets of approximately 8.5 m2 (92 ft2) were then added to the floor and their absorption values calculated. Absorption coefficient results will be presented along with a study of the derived coefficient values of each of the component surfaces. Similar ‘‘boundary only’’ results from an ‘‘empty’’ 500-seat theater will also be shown.
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