![]() ![]() Tiny holes for the nails must be drilled in the Plexiglass, or driving the nails in may result in fissures destroying transparency. In any case, the Plexiglass panels must fit the coffers precisely. If the ceiling construction is concrete, not wood, then holes must be drilled and special concrete bolts used. Thus, the mass of the total construction will be in effect to reflect low-frequency energy efficiently. The method is to drive nails through the Plexiglas into the wood decking behind with enough force to actually compress the acoustic tile and prevent the Plexiglas from vibrating. Adding the Plexiglas without further measures would provide high-frequency reflections, but low-frequency energy would pass through the Plexiglas to be absorbed by the tile behind and be absorbed by panel-vibration within the Plexiglas. ![]() Thin transparent Plexiglas (1/2-nch thick) is used because usually not much weight can be added to the ceiling. The proposed methods in this paper have not yet been used or experimentally verified, but such experiments need not be expensive and hopefully will be tried and verified by an acoustical expert faced with the problem in the near future.įigure 1 shows the first method. 2 But objections to either method occur when the tile has been painted with an intricate and well-loved design that must be preserved. Removal of the tile and refinishing hard surfaces behind, or covering the tile with hard material heavy enough to reflect low and well as high frequency energy are usual methods in solving the problem. Acoustical “dark-age” architects often did understand this and mistakenly assumed that was good for restaurants and sports venues and libraries would provide good acoustics in these performance and worship venues, to the detriment of these spaces’ usefulness. Sound-reflecting ceilings are a major component in assuring good natural acoustics in the title’s assembly spaces 1. Yeshivat Beit Orot, Shmuel ben Adiya 1, Mt. Proposed methods to make intricately-painted sound-absorbing acoustic-tile concert-hall, theater, lecture-hall, and worship-space ceilings sound-reflecting
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