With over 70 dancers and its own orchestra, The National Ballet of Canada ranks amongst the world's top dance companies. It performs three seasons annually. The 70-strong orchestra plays an average of 360 hours/year including rehearsals and performances. Rehearsals are held at two locations: one in a ballet rehearsal room with little or no absorption, and the other in an acoustically treated location. Performances are held in the Four Seasons Centre for the Performing Arts in Toronto. The present survey was done at the request of the National Ballet, since the musicians complained of excessive sound levels and were concerned about possible hearing losses. The survey was performed using five dosimeters Quest Mod 300 during 10 performances of the ballet Romeo and Juliet by Sergei Prokofiev, deemed as the noisiest in the whole repertoire. Results of the survey indicate that the noise exposure levels from only the orchestra's activities do not present risk of hearing loss. Exposure due to other musical activities was, however, not included.
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机译：加拿大国家芭蕾舞团拥有70多位舞者和自己的乐团，是世界顶级舞蹈公司之一。它每年执行三个季节。 70名管弦乐队平均每年演奏360个小时，包括排练和表演。排练在两个地方进行：一个在芭蕾舞排练室内，吸收很少或没有吸收，另一个在经过声学处理的地方。表演在多伦多四个季节的表演艺术中心举行。本次调查是应国家芭蕾舞团的要求进行的，因为音乐家抱怨声音水平过高，并担心可能会造成听力损失。这项调查是使用五台剂量计Quest Mod 300在Sergei Prokofiev演绎的《罗密欧与朱丽叶》芭蕾的10场表演中进行的，该表演被认为是整个曲目中最吵的。调查结果表明，仅管弦乐队的活动所产生的噪声暴露水平不会带来听力损失的风险。但是，不包括由于其他音乐活动引起的暴露。
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