In the recent years several traditional movie theatres have been re-designed and converted into concert halls. Three examples of such conversions are presented here. The basic parameters of the halls are introduced, and the results of extensive measurement series carried out in the concert halls are also given. The design concept of old Hungarian movie theatres included large spaces which allow sufficient volume per seat ratio for converting them into concert halls. Beside this advantage, the lack of the stage and the shape of the ceiling are the two main drawbacks that have to be eliminated during the design. In case of converting a movie theatre into a multi-purpose hall, one needs variable acoustics. In the third case introduced above, an electro-acoustic reverberation enhancement system was employed to satisfy the contradictory acoustical requirements of a lecture hall and concert hall.
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