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More than 20 years after the first applications of micro-perforated sound absorbers in architectural acoustics there still is a growing demand of this kind of sound absorbers. Based on the theory of micro-perforated panel sound-absorbing constructions by D.-Y. Maa in 1975 various materials have been used as micro-perforated sound absorbers. Fully transparent sound absorbers as well as printed and translucent materials allow a combination of acoustic and light design. 3D-shapes used as lamps and other applications have become available. The latest innovation also adds heating and cooling properties to this kind of ceilung construction. Measurements for different set-ups will be presented as well as applications in various projects from private rooms to publics spaces will be discussed.
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