Exposures and hearing thresholds in music students due to training sessions

Measurements of SPL's in sound emission from some wind instruments during training sessions of music students show all in excess of LAmax 110dB and reach LAmax 132dB in some cases. Long time average spectra in 1/3-octave bands and cumulative distribution functions show that e.g. sound pressure levels LA 50 are often around 100-110dB and in most instruments the spectra cover substantial range of frequencies. Resting hearing thresholds in many students show dips of various depths at 6kHz, which in some cases reach over 30dB. TTS2 measured at 6kHz following 4-hrs training session reach 40dB.