Abstract
Variable Acoustics has become an important topic in the acoustic design of multi-purpose venues but also in classical concert halls and opera houses. Varying the reverberation time in the middle and high frequencies can easily be achieved by using fabric-based absorbers like curtains or roll banners. When using fabric-based absorbers, the proportionally low absorption capability in the bass frequencies below 400 Hz can be challenging when planning a multi-purpose facility. A full range variable system would provide a great tool to consultants and architects. Double layer roll banner systems with a highly absorbing fabric are mostly installed freely hanging in front of the wall. Research shows a significant enhancement of the bass frequency absorption if the fabric is installed in an enclosed housing. This paper will examine the fundamental problem of low bass absorption capability but will also show the measurement data and technical solution for the described problem.
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