Abstract
As for the design criteria of the multi-purpose hall, Architectural Institute of Japan gave two recommendations about ten years ago. One is provided for the architectural stage design and the other is for the electric reinforcement system design. These recommendations have been practically used by the designers until now. But, it has been pointed out that they have already been unsuited for the recent circumstances of halls. This paper describes the results of the objective and subjective study of architectural, acoustical and reinforcement system conditions of multi-purpose halls studied in order to improve these recommendations. The fact-finding of recent multi-purpose halls has been made by the questionnair form. As investigation objects, existing multipurpose halls numbered over 30 were selected. In the questionnair for the superintendent of the hall, the performance ratio of all sorts, architectural and room-acoustical conditions and subjective estimations to them were asked. Likewise, in the questionnair for the electrical acoustic operator, reinforcement system conditions, acoustical effects by the system and subjective estimations to them were inquired. According to the results, it has been found that recent multi-purose halls have a tendency to be heavily used for music performances, especially for light music performances using the reinforcement system, and hall users generally desire to increase the scale and function of the system. The remarkable requirement of the operator is to increase the out-put power of the proscenium speaker system more 2.5〜4 times than the regulation power of the A-class criteria recommended by Architectural Institute of Japan.
