THE HOSTILE RELATIONSHIP BETWEEN ARCHITECTURE AND ACOUSTICS: AN INSIGHT INTO SALA VILLA LOBOS AT THE TEATRO NACIONAL DE BRASILIA

The Teatro Nacional Claudio Santoro in Brasília, designed by Oscar Niemeyer and inaugurated in 1966, is a landmark protected by IPHAN, Brazil's national heritage authority. The complex houses three performance halls: Martins Pena, Villa-Lobos, and Alberto Nepomuceno. The main hall, Sala Villa-Lobos, was completed in 1979 and has been widely criticized for its poor acoustics, rendering non-amplified performances nearly unfeasible. Despite these limitations, it remains home to the Teatro Nacional orchestra. While its subpar acoustic performance is often labeled an "acoustical failure," the architectural design plays an important role in this outcome. The fan-shaped auditorium has a wide splay angle of approximately 50 degrees, 38 m width in the first row, and 60 m in the last. The seating area occupies about 50% of the floor area. These architectural features pose significant challenges to achieving optimal natural acoustics. Addressing these issues would require reshaping the room - an intervention that conflicts with principles of historical preservation. Sala Villa-Lobos exemplifies the complex and often conflicting relationship between architectural design and acoustical performance.