Additional Info
Project Information
Reverberation Time Requirements
Room Dimensions and Properties
Sound Absorbers
List of absorbers
S. No. Select or remove Type Subtype Insulation Cavity (mm) Applied area (m2) Applied to Remarks
Calculation Results
Reverberation Times (T)
Frequency 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz
Before adding absorbers 2.10 s 2.66 s 4.20 s 4.10 s 3.94 s 2.57 s
After adding absorbers
Minimum required
Maximum allowed
Compared with requirement
Your browser does not support the HTML5 canvas tag, hence the reverberation time curve can not be shown.
  • The reverberation time results provided above are theoretical estimates only.
  • The location of sound-absorbing surfaces and sound-reflecting surfaces to achieve the design reverberation time is important.
  • The actual reverberation time in a room space depends on multiple factors and needs to be tested or verified by acoustics experts.
  • Where the control of reverberation in spaces is carried out for noise control purposes, the reverberation time should be minimized as far as practicable.
  • The sound absorption coefficients of Siniat's acoustic products are based on the latest published technical literature in Australia or overseas.
  • The sound absorption coefficients of non-Siniat products, occupancy and furnishing, etc. are either based on EN 12354-6:2003 or reliable online resources.
  • The calculation model is based on Sabine equation and is best applied to enclosed spaces with:
    • regular shaped volumes: no dimension should be more than 5 times any other dimension;
    • evenly distributed absorption: absorption coefficient should not vary by more than a factor of 3 between pairs of opposite surfaces, unless good sound diffusion objects are present;
    • not too many objects: total volume of objects is less than or equal to 20% of room volume.