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Figure 1. The sound level was measured in front of the speakers (approx. 10 m from the stage) and at the mixing console (approx. 50 m from the stage). The dotted line represents the position of the 10 volunteers, each of them being located at different distances from the stage.

Figure 1. The sound level was measured in front of the speakers (approx. 10 m from the stage) and at the mixing console (approx. 50 m from the stage). The dotted line represents the position of the 10 volunteers, each of them being located at different distances from the stage.