Abstract
This paper deals with measurements of early and late support parameters on the stages of 9 concert halls within the theatre heritage of Andalusia (southern Spain). The enclosures under investigation belong to two main categories of buildings: 7 proscenium theatres of two typologies (horseshoe-shaped and shoebox-shaped ground plans) and 2 auditoria. Wherever possible, measurements covered the two configurations with and without orchestra shells on the stages. The experimental procedure was carried out according to the ISO 3382-1 where monophonic impulse responses were measured using sine sweep signals in the 125-4000 Hz octave band range on the stage and in the audience area. The experimental results of support parameters versus frequency are compared with their predictions through the diffuse field theory using the reverberation times measured in the halls. The relationships of spectrally averaged support parameters with architectural elements of the enclosure of the stage are studied. Results show that the most significant regressions are for early support with the volume of the stage enclosure and its height/width ratio. The differences found in support measures due to the addition of the orchestra shells are also examined.
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