Here is a tip that always works to eliminate room resonance modes:
If you have a large enough room, aim the listener into a corner and rotate the speakers. This is the best way to deal with resonances. Sometimes in larger rooms at trade shows, the exhibitor will do this.
caesar, The beauty of my plan for curtains on the rear wall and on the rear third of each side wall is that they can be bunched to one side and decommissioned for audio use and retained solely for aesthetic use to delineate a rectangular room. I even could put RPG Modfractals or SMT wings in front of the curtains, retaining my small aesthetic objective about a rectangular looking room. The curtains just give me flexibility for the future and an aesthetic result I know I want, if nothing else.
caesar, The beauty of my plan for curtains on the rear wall and on the rear third of each side wall is that they can be bunched to one side and decommissioned for audio use and retained solely for aesthetic use to delineate a rectangular room. I even could put RPG Modfractals or SMT wings in front of the curtains, retaining my small aesthetic objective about a rectangular looking room. The curtains just give me flexibility for the future and an aesthetic result I know I want, if nothing else.