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Soundproofing vs. Sound-Absorbing: What's the difference? When it comes to acoustics, there are two different options: You can absorb the reverberant energy 2.0 BUILDING ACOUSTICS AND MATERIALS. 2. 3.0 ACOUSTIC PROPERTIES OF SPECIFIC BUILDING MATERIALS. 4. 3.1 Sound absorptive properties of materials. Research about different kinds of materials for traffic noise barriers. 10/31/2009. Page 2. 2. Acoustic materials (table of contents). Introduction… The basic parameters of acoustic materials are the impedance and the sur- face shape. The equations given in Sect. 3.1 are applicable as first-order. The paper presents the results of a wide experimental campaign on the absorbing properties of new acoustic materials made from recycled tyre granules mixedAcoustical sustainable materials, either natural or made from recycled materials, are quite often a valid alternative to traditional synthetic materials, Despite the fact that the compression of acoustic materials was not much discussed, it has certain effect on absorption properties of the acoustic tiles.