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</html><description>General Acoustics Concepts Resonant systems allow, by mechanical absorption, sound energy to be dissipated indoors and thus modify the reverberation time of enclosures. These systems can be subdivided into two types the resonant panels and the Helmholtz resonators. Resonant panels (next figure) are extremely effective, and recommended, for correcting gaps in the low frequency bands [&hellip;]</description><thumbnail_url>https://imperalum.com/cms/wp-content/uploads/2014/08/Sistemas-Ressonantes_1.gif</thumbnail_url></oembed>
