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sci.acoustic-absorption-coefficient Calculator
Calculates the acoustic absorption coefficient of a room surface material and the resulting reverberation time contribution. Concert hall surfaces are designed for α ≈ 0.1–0.4 — hard concrete has α < 0.02 (nearly perfect reflector); acoustic foam has α > 0.8.
Inputs
Incident Intensity Db
Reference formula or conversion factor shown for context.
Absorbed Intensity Db
Reference formula or conversion factor shown for context.
Room Volume M3
Three-dimensional space occupied (m³ or L). 1 m³ = 1,000 L.
Surface Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
absorption coefficient α
Sample size or count used in the calculation.
estimated RT60 (seconds)
The value at the specified point or condition.
NRC (noise reduction coefficient)
Random or irrelevant variation in the measurement.
Sabine RT60 = 0.161V/(αS)
Sample size or count used in the calculation.
target RT60
Reference formula or conversion factor shown for context.
α=0: perfect reflector; α=1: perfect absorber
Reference formula or conversion factor shown for context.