What is the general rule of soundproofing material?
Any wall there is an inherent resonance frequency, when the frequency of the sound wave and the wall resonant frequency of the same, the overall resonance of the wall, the frequency of the sound insulation will be greatly reduced
For the double layer of gypsum board wall, the law of quality plays an important role, that is, to increase the number of layers or thickness of the board can be improved sound insulation. As the keel double wall system sound vibration form is very complex, so the embodiment of the law of quality than the simple single-wall complex.
For a single layer of dense uniform wall, surface density for each doubled, the volume of the theoretical increase of 6dB, this law is the law of quality.
There is a general rule for partition noise, that is, the heavier the material (the higher the surface density, or the greater the mass per unit area), the better the sound insulation.
