Hi Mark,
Re your windows w/plantation shutters, certainly better at diffusion than just plain glass which would be very reflective, and certainly the open/closed positions of the shutters will affect it even more, but I'm not at all sure how broad the bandwidth would be, as compared to 'severe toe in'. I only mention this toe in because it is free (!) and worth trying just to find out, for example, if side wall reflections are affecting your sound negatively. BTW, if you go to many shows you will have noted that many set up's have this type of toe in as it helps eliminate a lot of the upper frequency room issues exhibitors are faced with. FWIW, I'm not sure I would like diffusion on the side walls, damped yes, diffused not so much. I like diffusion more behind the speakers and the listener position.
You could also hang a heavy blanket over the shutters and determine from this the extent of the differences with a 'wall' with minimum high frequency reflections, one without - just glass, and one with the shutter blades open/closed. Different speakers sound differently depending a lot on their tweeters dispersion characteristics. I'm not familiar with yours.
Another thing to consider re the toe in I suggested - it can take a lot of the room issues out of the sound stage, makes it more of a 'near field' listening experience. For some this is bad - folks like all of the bouncing sound waves which can appear in the form of a 'larger' soundstage with sounds appearing outside the speakers. For some this is good - you can get awesome clarity but you won't get soundstage affects outside of your speakers (which is actually the 'correct' sound for a properly set up system, wherein all in-phase information occurs between the speakers and only out of phase information on the recording can appear outside the speakers.
But, as I said in my other post, your set up looks pretty good, and my suggestions assume something which may not exist. Be careful, anxiety can be expensive. :-)
Re your windows w/plantation shutters, certainly better at diffusion than just plain glass which would be very reflective, and certainly the open/closed positions of the shutters will affect it even more, but I'm not at all sure how broad the bandwidth would be, as compared to 'severe toe in'. I only mention this toe in because it is free (!) and worth trying just to find out, for example, if side wall reflections are affecting your sound negatively. BTW, if you go to many shows you will have noted that many set up's have this type of toe in as it helps eliminate a lot of the upper frequency room issues exhibitors are faced with. FWIW, I'm not sure I would like diffusion on the side walls, damped yes, diffused not so much. I like diffusion more behind the speakers and the listener position.
You could also hang a heavy blanket over the shutters and determine from this the extent of the differences with a 'wall' with minimum high frequency reflections, one without - just glass, and one with the shutter blades open/closed. Different speakers sound differently depending a lot on their tweeters dispersion characteristics. I'm not familiar with yours.
Another thing to consider re the toe in I suggested - it can take a lot of the room issues out of the sound stage, makes it more of a 'near field' listening experience. For some this is bad - folks like all of the bouncing sound waves which can appear in the form of a 'larger' soundstage with sounds appearing outside the speakers. For some this is good - you can get awesome clarity but you won't get soundstage affects outside of your speakers (which is actually the 'correct' sound for a properly set up system, wherein all in-phase information occurs between the speakers and only out of phase information on the recording can appear outside the speakers.
But, as I said in my other post, your set up looks pretty good, and my suggestions assume something which may not exist. Be careful, anxiety can be expensive. :-)