Variable acoustics of theatre �de Spiegel� in Zwolle (NL)
- Autores: Maarten Luykx, Rob Mertkemeijer, Martijn Vercammen
- Localización: Proceedings of the ISRA 2007 Seville, Vol. 3, 2008 (Oral Session Communications), ISBN 9788469082676
- Idioma: español
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Resumen
In 2006 the new theatre in Zwolle (NL) has been completed which can be considered as a next step in variable acoustics. The hall is not only suitable for intimate plays (850 seats) but also for opera and symphonic concerts (1000 seats), in all situations with natural acoustics. The variable acoustics necessary are obtained by altering the very compact volume of the theatre (about 4100 m3) into about 11000 m3 for symphonic music. Using 370 m2 of movable ceilings an additional volume of about 4100 m3 above the hall is realised using an 7 m high gallery. Additionally, an orchestra shell of 2.800 m3 can be applied. A 1:12 scale model has been used in the design phase to verify the acoustic behaviour. Reactions of listeners and critics are very positive (�Masterpiece of variability�). The acoustics of the real hall have been measured in May 2007, revealing interesting properties. RT values are 0.9 s for theatre up to 2.1 s. for symphonic music. Average C80(3) values range from 0 dB for concert use, 4 dB for opera up to 7 dB for theatre. The hall combines the sightlines of a theatre and its intelligibility with the reverberation of a concert hall, making it an excellent opera house as well
