Our campus festival is promoted by the students of the festival society at Shibaura Institute of Technology for 3 days every year. It is held the event and the booth where participant sells frankfurts, beers and etc. The students build the open-air stage in the festival, and then the students of participant perform band performance and dance performance on there. There is usually held many performances from 10 o'clock to 18 o'clock for 3 days. It is built adjoin the booth, and the audiences can approach there. They play songs and dance using the loudspeaker. It generates the big volume in front of the open-air stage. It is shown that the sound pressure level (L_(P)) was over 100 dB at the center point (Mizuta et al. 2011). This paper shows that we analysed L_(P) at 8 measuring points around the open-air stage.
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