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The French Institute of Research and Coordination Acoustics and Music was defined as a part of a larger project for a contemporary art museum in the city of Paris by architects Mike Rogers and Renzo Piano. Among the various spaces of interest, it features a variable acoustics hall whose RT can vary from 1.1 to 4.4 s. This is obtained using a variable-height ceiling in three parts (so as to reduce the volume) that can be moved independently, while both the walls and the ceiling feature movable panels that will, according to the requirements, be either reflective, diffusive, or absorptive .
The Culture Centre of Grenoble (France) was inaugurated in 1968. Designed by architect Andre Wogenscky, it featured a music auditorium, a large theatre hall, as well as various other performance halls and their supporting rooms. A major rehabilitation project was performed at the beginning of the 21st century by architect Antoine Stinco.
Due to its elliptical shape, the 998-seat auditorium needed some highly diffusive treatment on the walls to prevent the apparition of echoes. The study of the treatment was performed first using a computer ray tracing model, and later on using a 1/16 scale model. The latter proved useful in many ways: To start with, it enabled the acoustician to perform an experimental study to optimize the shape of the diffusive surfaces while taking into account the coupled spaces of the galleries. Next, it also helped convince the architect and the client regarding the general appearance of the hall, while showing rather easily how the removal of part of the treatment would result in an echo.
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