Abstract
A new acoustic parameter has been defined for the acoustic brief of the Philharmonie de Paris Concert Hall. With a seating capacity of 2400 and the audience enveloping the performers on all sides, the new hall will be at the upper limit of the ideal range for symphonic music, and an efficient acoustic design was called for. In order to relate architectural design to acoustic efficiency, and based on quantitative study of existing halls, an early efficiency parameter was developed. For the Paris Philharmonie the brief requested a total area of 1400 m2 of surfaces being able to create early reflections, with 500 m2 being less than 15 m from the stage. The studies leading to the definition and the justificantion of the parameter will be presented. Another, more accurate definition expresses the early efficiency parameter in terms of the solid angle for a source on stage, allowing generalization of the new criterion for all hall sizes.
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