Quick update- I caved and purchased four ATS 'real' diffusers. They normally come four feet tall but I had them build them six feet tall for me (at only $10 more per diffuser which I thought was a killer deal, despite the high cost of the diffuser itself)- here is the end result.
In short, the sound really changed in my room:
* Yes, better sound stage layering
* Highs are significantly elevated, almost like someone turned up the EQ on the highs
* Music has much, much more 'atmospheric' quality to it- lots more air
I'm still listening and learning all the changes these made, and if I need to adjust my subs a bit.
Thanks for the advice on these.



