Sound Transmission Loss Calculator

Estimate the sound transmission loss of a single-leaf wall using the mass law: TL = 20 * log10(f * m) - 47.3 dB.

Hz
kg/m2

Transmission Loss

32.70 dB

Transmission Loss vs Frequency

Voir la formule →

Formule

## Mass Law for Sound Transmission Loss The mass law gives the theoretical TL of a single homogeneous panel. ### Formula **TL = 20 log10(f m) - 47.3 dB** - *f* = frequency (Hz) - *m* = surface mass density (kg/m2) Doubling the mass or frequency increases TL by about 6 dB. This is the field-incidence mass law, valid below the coincidence frequency.

Exemple Résolu

20 kg/m2 concrete panel at 500 Hz.

  1. 01TL = 20 log10(500 * 20) - 47.3
  2. 02TL = 20 log10(10000) - 47.3
  3. 03TL = 20 * 4 - 47.3
  4. 04TL = 80 - 47.3 = 32.7 dB