View from a recent model. Wire frame of the same model.
As these pictures attest - we put quite a bit of detail into the room models we build.
 
That detail extended to careful inclusion of scattering data according to the shape and size of each surface using the in-built scattering wizard. Absorption coefficients were selected from the Ease database and the authors collected information.
 
A test loudspeaker and listener seat were installed in the model at the same locations as a balloon burst and test microphone were placed in the real space.
 
The Impulse response was generated in the model using the Aura routine and exported as a plain wav file. There are a number of formats available including Binaural Impulse Response - here we show the *.wav file opened in a free editor package.
 

We can then pull that simulated ballon burst into the Easera measurement package.
 
We also open the recorded balloon burst file from the real space.
 

And we overlay the RT60 plots from both files. This is an excellent outcome. The region below 300Hz shows differences related to unknown material thickness & absorption in this heritage building.

No adjustments were made to the model to arrive at this result. The model was simply built, with care and attention to detail, then tested.

The RT60 derived from the Aura routine / Impulse response calculation does not always reflect the real room RT60 measurements quite this well. Disparities between measured, Sabine calculations and Aura simulations are usually associated with a difference between scattering coefficients in the model and the real scattering properties in the room. There are other factors such as the absorption coefficients used compared to the behaviour of the real surfaces but when care is taken good results are obtained.

The Sabine calculation of room reverberation time can be misleading, especially in spaces where the absorbing materials are concentrated in one area of the space, eg the ceiling or the floor. For this reason the balloon simulation is used to reconcile the model with reality.

There are products which compete with Ease. We see the integrated product lines of Ease & Easera as the most cost effective and efficient systems available.