The Auditorium remains the same in its operation compared with the historic Solís Theatre's auditorium. Therefore, its structure keeps the typical lyrical theatres features, that is, with the orchestra and four gallery levels: Tertulia Baja, Tertulia Alta, Cazuela and Paraiso in their Spanish names. People access through the hall to every level. Due to acoustic and safety reasons external walking aisles where made in every level. The intervention in the Auditorium restored the whole heritage elements and an important acoustic adjustment.