Hi, Norman. Thanks for joining! Correlating the listening with the measurements is the hardest I think in acoustics, where the science and the art meet head on. Because Room acoutics is a multi-variable problem.
We know about Schroeder curves, but the interaction of the Shroeder RT curve with things like transient reproduction and spreading is very involved. Transient perception and frequency response, both the direct and the delayed — are complexly intertwined. Change one aspect and it affects our listening. Should we add some softening on the walls or “diffusion”? (Scattering). I know what I like, I know what I hear in my mastering room, I know the areas in listening where I would still like to improve it —- but I only Suspect what the next step will be to take the room to the next step. I’m going to try some scattering to be placed over some traps on the back wall….. Fortunately it’s subtle, I’m down to the last tweaks and I can work perfectly well as the room is now!