Measurements in opera houses: comparison between different techniques and equipment

In room acoustics many objective parameters to quantify subjective impressions have been introduced. These quantities can be measured by using a wide variety of powerful tools and equipment. The results can be influenced by the measurement techniques and instruments used. Furthermore the results also depend on the position and condition of the hall in which the measurements are made. With the aim of obtaining a procedure to qualify a room, and in particular an opera house, which will give comparable and reproducible results anywhere else, an extensive measurement campaign was made. In this paper some of the results of the measurement campaign are presented. Comparisons were made both between different tools (real-time analyzer, DAT, PC-board, sources) and between different techniques (stationary, impulsive, pseudo-random).