Reverberation
A₀ = 0.161 × V / T₀
ΔA = S × (α₁ − α₀)
T₁ = 0.161 × V / (A₀ + ΔA)V is room volume in m³. S is projected treated area in m². The assembly coefficient must match its mounting and fullness. Do not multiply tested projected area by fullness again.
Assumes an approximately diffuse sound field, unchanged room use and a positive equivalent absorption area. It excludes low-frequency modal behaviour, flanking paths and sound insulation.
Sabine equation reference ↗