Sound -absorbing

— Sound -absorbing

— Sound -reflective.

As a rule, in the manufacture of a soundproof structure, it is customary to use one and the other. In general, in acoustics it is customary to alternate sound -refracting and sound -absorbing layers to increase the properties of materials used to isolate the sound. Sound -insulating materials, unlike sound -absorbing, are installed in the form of cushioning layers in the structure, so that they are not visible. They are located between the outer shells and are located in free, and sometimes even in limbo. Layered structures are formed from several layers that differ from each other density and rigidity, so the best sound insulation is achieved.