Surface Absorption ?

[lalaland]

In the Room sim we have Surface absorption.
At what freq is this ?
If I want to input say a Plaster board wall on studs it will have certain absorption at a certain freq bu I can only input one number.
Any tips ?

 

[John Mulcahy]

The room sim has constant absorption, so pick a figure for a frequency near the middle of the span you are interested in.