The reverberation chamber at the Laboratorio de Acustica y Luminotecnia of the Comision de Investigaciones Cientificas de la Pcia. de Buenos Aires is a room of 189 m 3 , of irregular form and with walls on non-parallel planes, used for acoustic absorption measurements. The chamber, its volume computation, the acoustic absorption areas, the reverberation times, the uniformity and diffusion of the sound field and the background noise levels are described.The diffusion of the sound field with the addition of different types of diffuser elements randomly suspended from the ceiling was evaluated.The chamber fulfils the ISO 354 recommendations.