My listening living room has one feature that throws another wrench into the equation - adjustable sidewall "vanes" in the form of adjustable room window/door slats - the old fashioned wooden slats that can be angularly adjusted with the pull of a cord. Most of the these "windows" are actually full length so there is plenty of slat real estate to play with. All of the windows in the room then become adjustable sidewalls (and rear walls,) and with the slats in the horizontal position, which lets into the room maximum daylight there is a big sonic difference compared to say the other extreme - all slats closed - or any slat angle in between.
Behind the window slats are double pane gas filled insulated glass windows and doors and this introduces another effect in general. Also, even when the slats are fully closed - making the room somewhat dark - the slats are still ridged enough that reflections are still modified. These old fashioned slatted windows and window/doors are beginning to fall apart, and my wife has suggested they be replaced with fabric covered slats which would probably be more acoustically agreeable to play with
Point is having sound diffusers that are adjustable on the fly does make for more ways to tweak. There is nothing new about this idea. I can think of more than a few audio heads who use slatted windows as acoustic playgrounds, but it was an option that was "inherited" with the home - not purpose built for acoustics. It does beg the question as to how many suppliers of acoustic room panels have some sort of option like this. I couldn't find any online.
