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A thin sound-absorbing cotton
can absorb the high frequency, low frequency cannot absorb. The
following two different thickness (25mm, 50mm) with different
absorption coefficient of sound insulation cotton. From the
experiment can be found, the polyester fiber sound-absorbing
cotton with different thickness, the absorption of high
frequency is the same, but the low frequency absorption is very
different. Usually use sound-absorbing cotton is sandwiched
between two layers of sealing cardboard (usually gypsum board),
the two layer thickness of gypsum board spacing of 50mm is 30mm,
separated by wooden props, 600mm apart between the pillars of
space, is 25mm thick cotton insulation, if there is no sound
insulation cotton, sound insulation effect is relatively poor.
But for the bass sound insulation effect is not very good,
The thickness of the thickness to 55mm, the use of 50mm thick
insulation cotton, and two layers of each of the two layer of
gypsum board, can obviously feel the sound effect of the sound
insulation, especially low frequency.
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