John S. Bradley
M-27, IRC, Natl. Res. Council, Ottawa, ON K1A 0R6, Canada
A. C. Gade
Tech. Univ. of Denmark, Lyngby, DK 28000, Denmark
G. W. Siebein
Univ. of Florida, Gainesville, FL 32611
In a measurement tour of nine U.S. concert halls measurements were made at 30 or more combinations of source and receiver position in each hall. Each of the three measurement teams (the University of Florida, the Danish Technical University, and the National Research Council of Canada) made parallel measurements of a number of modern room acoustics quantities using different equipment and measurement procedures. These results are compared on a seat-by-seat basis and the differences are explained in terms of earlier systematic studies of the effects of measurement procedure details. The measurement results were also used to examine the influence of different measurement equipment and measurement procedures on the within hall variations of the various acoustical quantities. [Work partially supported by the Concert Hall Research Group.]