This comparison between the EDT calculated with the SPPS and the MD code and those from the reference method (i.e. the radiosity method) shows a very good agreement, with a very small deviation around the location of the sound source. Concerning the TCR code, as expected, the obtained values are identical for all receiver locations. However, in this ideal case (cubic room with diffuse reflection and low/uniform absorption, i.e. the Sabine's assumptions for diffuse field), the TCR code gives relevant results (particularly using the Eyring's formulae).

Here again, regarding the y-scale, a very good agreement is observed between in terms of EDT, between the SPPS/MD/TCR code and the reference method (i.e. the radiosity method).

This figure shows an Inverted behavior between the tested codes and the reference data, i.e. a decrease of the EDT for the reference data, while we observe an increase of the EDT with SPPS/MD. It seems that the line 3 of receivers is reversed between the I-Simpa simulation and the reference data. In this case, if we reverse the line, we observe a perfect agreement.

In addition, it must be note a difference for the receiver 9 between the two SPPS simulations (2008 and 2017), which is due a wrong position of this receiver in the 2008 simulation.