Maurice Ravel Auditorium

The building was built without an acoustic study which resulted in the volume being too low for symphonic purposes, with a reflective concave back wall. The stage had no lateral walls, which resulted in the musicians struggling to hear one another. The wall was eventually treated to prevent strong echoes. Eventually a Phillips acoustic enhancement system was fitted to help with sound coverage and reverberation. ==The organ==

In 1878 the renowned French organ builder, Aristide Cavaillé-Coll, was commissioned to build a concert organ for the Trocadéro concert hall, under the supervision of renowned organist and composer Alexandre Guilmant. Because of the time constraints of the contract he did not have time to build one from scratch and had to use an uncompleted three-manual organ originally intended for the Church of Notre Dame in Auteuil, a district in the northwestern area of Paris, as the basis for the new instrument. The organ moved to the Palais de Chaillot when the Trocadéro was demolished and was ultimately bought by the government of Lyon for the Auditorium. ==References==