Abstract
The subject for the research is Dalby church in Sweden which supposes to be the oldest stone church in Scandinavia. There are holes in the ceiling of Dalby church. Behind these holes are ceramic pots. In Swedish Musicology studies, the relationship between acoustic pots and acoustic resonators is poorly documented. Similarly, there is limited information on the difference in reverberation time in churches from late Middle Ages compared to present time. In the late medieval churches, the reverberation time must have been different than it is in churches today. There were more visitors and they had clothes made of heavy fabrics which would have affected the reverberation time. Currently, the reverberation time measurements are made without visitors which affect the reverberation time itself. This investigation is based on theoretical studies combined with practical reverberation measurements in Dalby church and simulations in ODEON in a 3D-model of the church. Following questions will be answered: What was the difference in reverberation time in Dalby church in late Middle Ages compared to present time? What's the contribution of ceramic pots to reverberation time, speech transmission index, or speech intelligibility?
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