The room to my ear is on the bright side with a bit of slap echo. As I do not find the DI's bright, I don't mind a room on the "live" side. But I suspect some side wall treatment is in order.
The other issue is bass response. I received my Hsu sealed subs. They came with a nice test disc. This was an eye opener. While I knew the DI's had tight bass in my room, testing really reinforced my impression. There was a marked null at 40-50hz, and then better output to 30hz (the tuning frequency of the port), with little below that. I have pretty much an equilateral triangle with speakers/chair. Moving this all out further into the room placed my listening spot closer the rear wall, and with the subs in the front corners, I did clearly improve the null. (40hz still a bit down in response) Response now in the room has good extension to 20hz and at least by ear fairly smooth up to 80-100hz where there is a bit of a peak.
So in an effort to improve the acoustics of my room I've been reading all kinds of posts/articles--- and advice is all over the place. Some say clearly to treat first reflection points, others say this will close down the sound stage (which I really would not desire). ? use diffusion instead on side walls a combination of diffraction/absorption. Bass traps to smooth the 80hz peak (and how the heck do bass traps "know" I only want to dampen at 80hz, not 40hz??). I am limited as only one corner is available for traps (subs in front two, door in the other).
I know in the end I'll have to probably just try things. Just hoping to avoid costly mistakes. Thanks guys.

