Room acoustic designs for the Tokyo International Forum

The room acoustic design of the Tokyo International Forum centered around the four performance halls: the convention center, the atrium, and the large multi‐use meeting/dining halls. This paper will describe the program use of each space and the acoustic criteria developed to meet these requirements. Major emphasis will be placed on Hall A, a 5000‐seat congress hall that was to be used to unamplified symphonic concerts and operas as well as highly amplified Broadway musicals and rock concerts, and Hall B, a 1500‐seat classical music hall and piccolo opera house that also would be used for conferences and popular entertainment. A unique architectural feature of Hall B is the first design and installation of a Concert Hall Shaper, a device that enables a proscenium theatre with a stagehouse to be converted to a single acoustic volume for events such as symphony concerts requiring a longer reverberation time. Hall C, an extremely flexible space for fashion shows, summit meetings, and large receptions, and Ha...