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Acoustic values

Sabines formula

Formula for calculating reverberation in a room. The reverberation time (in seconds) = 0.161 x the volume of the room in cubic meters. Divide this by the sum of the surfaces in the room multiplied by the absorption coefficient of each material. Take out the value of the most common surfaces in the room. Absorbence tables are available for most building and surface materials.

Meeting rooms, schools, kindergartens should be at 0.6 seconds.
Lecture halls, concert halls, etc. should be at 1.5 seconds.

NRC - Noise Reduction Coefficient

Measures of sound absorbed by a material, and represent an average of the sound absorption coefficients at 250, 500, 1000 and 2000 Hz. The values ​​range from 0 to 1.

Rw (formerly called STC - Sound Transmission Class)

Measures for sound insulation performance against airborne noise measured in dB for a single building element (walls, windows, etc.) The higher the Rw value, the better the sound insulation.

Rw values:

  • 25 Normal conversation can be heard through
  • 30 Loud conversations can be heard
  • 35 Loud conversations can be perceived but not understood
  • 42 Loud conversations are heard only as mumbling
  • 45 One must make an effort to hear
  • 48 Only occasional loud noise from a call
  • 50 Loud conversation cannot be heard at all

IIC - Impact Insulation Class

The ability of a material to isolate impact noise, measured in dB. Used by acousticians in a method where small hammers strike the floor or a material at certain frequencies, and measure noise on the underside and make a graph.

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