 The Salle de Musique de Chambre, the ticket office and access to the underground car park are not within the main building, but are next to it outside within two aluminium-covered shells which lean against the filter of columns.The acoustic design of the three halls is the work of Chinese-born acoustician Albert Yaying Xu with AVEL Acoustique [Jean-Paul Lamoureux et Jérôme Falala].Designed on the concept of a "shoebox", the Grand Auditorium has a volume of almost 20,000 m3 and seats up to 1,500 listeners.