| I will go even further than Thomas and state that acoustics is non linear even at the same SPL.
I did several measurements in all kinds of buildings: usually normal typical restaurants, bars and bedrooms due to building acoustics but also in some concert halls and theaters always using a pro sound level meter and an omni sound source.
When measuring RT and transmission loss which is what I usually measure at I always get different results particularly at low frequencies.
Above all acoustics is a statistical science and based in empirical measurements. Formulas are used for us to understand the real world or the perception of it and not the other way around. |