Looking at three extensive acoustic field measurement investigations carried out over the last 15 years, we can see that with improved room acoustic treatment the speech and activity sound levels in classrooms are reduced much more than would be theoretically expected. It is interesting and vital to understand how these benefits affect the core teaching and learning processes and how we in turn need to look beyond single number room evaluations and rather focus on how we can have a better interpretation of the complete room acoustic responses. Looking at the subjective speech behaviour in connection with sound level measurements and the corresponding questionnaires and post occupancy evaluations we can understand more about the vocal load, sound levels and listening conditions in different classroom acoustic conditions.
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