Abstract
This report proposes the stage volume ratio (Vo/V) as an acoustic design factor for concert halls and presents an investigation of the dependence of the acoustic parameters of an auditorium on the stage volume through computer simulation. Firstly, the ratio of the stage volume to the total volume of a concert hall was defined as Vo/V through case studies of existing concert halls. It was verified using a simple model that the stage acoustic parameter STEarly and audience acoustic parameters G and C80 decreased, whereas, the reverberation time and early decay time increased with increasing Vo/V. Secondly, a computer simulation was performed for nine existing concert halls, while changing Vo/V from −20% to 30%. The room acoustic parameters exhibited the same patterns as suggested by the simple model. Vo/V significantly affected the bass ratio and bass index. A comparison of the effects of Vo/V and the sound absorption coefficient in nine concert halls revealed that Vo/V contributed approximately 15% to the reverberation and affected the bass characteristics more substantially. Thus, Vo/V is a critical design factor when determining the warmth of the audience acoustics. The study results could be used as a basis for acoustic design in the future.
Highlights
Concert halls that are considered good according to many people have existed for almost 100 years, and most recently built halls have been aging for at least 30–40 years
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Summary
Concert halls (such as Boston Symphony Hall, Vienna Großer Musikvereinssaal, etc.) that are considered good according to many people (architects, musicians, engineers, etc.) have existed for almost 100 years, and most recently built halls have been aging for at least 30–40 years. Concert halls have been designed to be located in large cities, where they are required to accommodate a large number of users in terms of tourists and floating population. In this context, reckless expansion of the halls is taking place, and in particular, the stages are being expanded to accommodate performers, such as large orchestras. Construction of concert halls that have indiscriminately large volumes cannot be accommodated at or near sustainable locations or commercial areas in urban centers. In such cases, the roles of an acoustician and architect become all the more important during initial design stages [2]. Stage acoustics in concert halls has been researched from the perspective of musicians and the audience, and various methodologies have been proposed in terms of design and acoustics [4,5,6,7]
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