Which coefficient for sound insulation?
the coefficient absorption acousticwhose value is between 0 and 1: when its value approaches 1, it means that theinsulating has a very good ability to contain sound wave energy.
The minimum low frequency is calculated with the 1/4 of the wavelength in your room listening. Let’s take an example with your room, along the length: The air velocity is C = 343.707 m/s. 1/4 of the speed of air is 343.707 / 4 = 85.927 m/s.
Insulation against impact noise (musician beating time, drum sounds, etc.) requires the construction of a floating screed with a well-suited underlay (mineral wool, rubber, bituminous felt, etc.). Any “acoustic bridge” between the screed and the structural work must be avoided:
Indoors or outdoors, they pass under doors, through gaps in windows, roller shutter boxes… Noises outside the room or dwelling, propagating through the building structure (falling or moving objects, impacts of heels, passage of the subway…).
How to measure noise and sound insulation? The unit of noise measurement is the decibel (dB) and its scale goes from 10 dB (near silence) to 130 dB (pain threshold). Here is a quick table explaining to which decibels correspond the different noises that we can encounter in our daily life.
Note that sound insulation often goes hand in hand with thermal insulation of housing. Note: For the sound insulation of impact noise, the propagation of sound in the walls would require sound insulation of all the walls of all the rooms (walls, ceiling, floor).