NOTE 1 – With A_i as the Sabine absorption of the i-th surface or object or medium in a room, room absorption is A = Σ A_i.

NOTE 2 – Sabine absorption due to dissipation in the medium, in a room of volume V, is:

${\displaystyle A_{\text{m}}=\frac{4}{10\text{l}\text{o}{\text{g}}_{10}\text{e}}\alpha V=\mathrm{0,921}\alpha V}$

where:
α is the attenuation coefficient of the medium in decibels per unit length.