Research chambers of the ITB Acoustics Department (ITB archive); upper left: reverberation chambers for sound insulation of small elements (built in 2000); upper right: reverberation chambers for sound insulation of large elements (built in 1962); middle left: reverberation chamber for sound absorption (built in 1962, modernized in 2010); middle right: anechoic chamber (built in 1962, modernized in 2000); lower left: airflow resistivity test facility; lower right: dynamic stiffness test facility.