Room acoustic measurements are an important tool for objectively assessing the acoustic qualities of an auditorium. In restoration projects, measurements are used to capture the acoustic fingerprint of the room before any construction work takes place and to analyse the changes after completion of works. For new buildings, acoustic measurements are used to prove that the hall meets the acoustic requirements. Measurements in the unoccupied room are usually conducted very thoroughly, with multiple source positions on the stage or podium and many receiver positions in the auditorium. Depending on the size of the auditorium and the available equipment, these measurements often span a full day or even longer. While unoccupied measurements deliver a large amount of relevant acoustic data, they lack a key factor which is part of the acoustic experience of a concert: the audience as sound absorbing and scattering surface. In addition to the measurements in the empty hall, it is therefore important to also conduct occupied measurements.
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