Sound Absorption Calculator
Calculate the total sound absorption in a room: A = sum of (surface_area * absorption_coefficient) for all surfaces.
Total Absorption
59.00 m2 Sabine
Total Absorption vs Surface 1 Area
Formula
## Room Sound Absorption Total absorption determines how quickly sound energy is removed from a room. ### Formula **A = sum(S_i * alpha_i)** - *S_i* = area of surface i - *alpha_i* = absorption coefficient (0 = perfect reflection, 1 = perfect absorption) This value feeds into the Sabine equation for reverberation time.
Esempio Risolto
Room with concrete walls (100 m2, alpha=0.05), carpet floor (80 m2, alpha=0.3), acoustic ceiling (50 m2, alpha=0.6).
- 01A = 100*0.05 + 80*0.3 + 50*0.6
- 02A = 5 + 24 + 30 = 59 m2 Sabine
- 03Average alpha = 59 / 230 = 0.257
Domande Frequenti
What materials have high absorption?
Open-cell foam, fiberglass panels, heavy curtains, and carpet typically have alpha above 0.5 at mid-frequencies.
Does absorption coefficient vary with frequency?
Yes, significantly. Most porous absorbers work better at higher frequencies. Bass traps are needed for low-frequency absorption.
Can alpha exceed 1?
In the Sabine model, measured alpha can slightly exceed 1 due to edge diffraction effects. This is a known limitation of the Sabine approach.
Impara