Initially, this study must be seen as a pilot project. Therefore, only a total of ten sound pressure level
measurements were carried out during the rehearsals so far. The sound level meter XL2 by NTi Audio was used as
measurement device which exceeded – in conjunction with the appropriate microphone – the accuracy class 1 of
IEC 61672-1 [21]. Attempts were made, to take several impact factors into account during the sound measurements.
Thus, not only the position of the sound level meter was varied in order to detect all different groups of instruments,
also measurements in different rehearsal premises were carried out.