Equivalent absorption area
In a diffuse sound field, the Equivalent Absorption Area is that area of a surface having an absorption factor equal to 1, which, if diffraction effects are neglected, would, in the same diffuse sound field, absorb the same power.
Applicable units are those of quantitykind:Area
https://www.acoustic-glossary.co.uk/sound-absorption.htm#:~:text=Equivalent%20Sound%20Absorption%20Area%20(A,reverberation%20time%20in%20a%20room.
In a diffuse sound field, the Equivalent Absorption Area is that area of a surface having an absorption factor equal to 1, which, if diffraction effects are neglected, would, in the same diffuse sound field, absorb the same power.