Beethoven`s Opera Fidelio was performed inside the walls of Thessaloniki`s Byzantine castle. The need for the raise of the reverberation time of this open space was satisfied with an ambiophonic application that used electroacoustical devices in order to generate and amplify the already existing reflections. The whole system was designed to provide a reverberant and highly diffusive character, with the needs for speech intelligibility taken into account.
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