@kota1 That window of mine behind my speakers has been my biggest worry in the room but i went the other route--electing to absorb the sound b/c i was afraid of the highs being emphasized--never occurred to me to go the diffusion route--how much did that "cloud" diffuser cost? I might have to try that as it looks about as big as my window.
Found it interesting that Sonitus feels a mixing room is the same as a 2 channel listening room--might have to ponder that -- seems plausible unless the mixing room is also where the player(s) are and then you would think they would generally go for diffusion to mix into the recording rather than absorption to tame reflections.