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In theaters or opera houses, the stage elevator is one of the most important machinery elements. It can be used for holding decorations in place and moving them between scenes or providing effects by elevating large decorations or choirs directly in a play. This scenic movement is a crucial situation from a machinery acoustics point of view. To localize and understand the sources of sound from these elevators, suitable experiments can be performed, e.g. sound pressure level (SPL) measurements, experimental and operational modal analysis. From previous measurements, the drive train could be identified as an important sound source. To quantify suitable quality requirements, the SPLs were measured in various theaters throughout Germany. The new key idea was to do the measurements while playing a drama or opera and to evaluate time periods of calm breaks during the play. This procedure published herein, where the masking effect of noises caused by the auditorium listening to a play is taken into account, lead to a new SPL requirement for the noise radiation of the stage machinery of theaters and opera houses. Last but not least, the results of these measurements in different German theaters, are compared and discussed.

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