Timlub, as notes of interest I have had almost the same number of years as yourself wrestling with this bizarre and at times excrutiatingly frustrating "addiction", and also my room is almost a perfect size match to yours.
For me, when the system is working correctly, i.e., low levels of distortion, the auditory experience is that the end wall completely dissolves and the room becomes attached to the location where the recording was made, the "window" experience, I guess. If a large scale orchestral, then exactly if one were sitting in a private stall in the concert hall. It is no longer that of a musical event in a room, the sensation is that the whole house has somehow been transported and is sitting next to where the musical event is happening, and is a mere extension to the "soundstage". Very hard to get to happen, but very much worth it!
Frank
For me, when the system is working correctly, i.e., low levels of distortion, the auditory experience is that the end wall completely dissolves and the room becomes attached to the location where the recording was made, the "window" experience, I guess. If a large scale orchestral, then exactly if one were sitting in a private stall in the concert hall. It is no longer that of a musical event in a room, the sensation is that the whole house has somehow been transported and is sitting next to where the musical event is happening, and is a mere extension to the "soundstage". Very hard to get to happen, but very much worth it!
Frank