Inside the Room
The front 1/3rd of the room is very bass trapped along with the back walls of the room. There needs to be some vertical control added to the front of the room, ceiling-mounted bass traps or some architectural tricks that get that same job done. We have to eliminate or calm down the uncontrolled buildup of lateral and vertical early reverberation up there in the front 1/3rd of the room. The side walls are for imaging, ambience and spaciousness acoustic fitment. Usually a blend of mid-bass absorption and specular treble diffusion. Remember, you want specular coherent reflections, not random phase distorted, or resonant incoherent reflections.
Then the back walls are where the deep, large bass traps go. There are two reflective zones, kicker reflection areas that illuminate the reflectors on the side wall acoustics.
It is sometimes possible to have an open-plan listening room…