Acoustic Measurements in opera houses: comparison between different techniques and equipment

A standardized measurement technique for the collection of a complete objective description of an opera house acoustics is proposed. The results obtained from measurements made in three different halls were compared between different hardware and software tools and between different measurement methods as well as between different positions in the halls, with and without the presence of musicians and audience. The only effective differences were found regarding the recording techniques, as the monaural measurements give appreciably different results from the average of left and right channel of binaural measurements. Slightly different results were also found between true impulsive sources and omni-directional loudspeakers.