Diagonal setup of system...

yes, you still need to tend to 1st and 2nd reflection points (bass panels ala jon risch worked fine), tube traps in the corners to absorb standing waves, and i've also found that diffusion works behind the listener---i made a home-made RPG diffusor that made a nice difference when mounted behind my seat.

also, for small rooms, make sure your seat is far enough away from any walls / corners so that coloration is not present (you can hear it. just slowly walk forward from the wall while listening and you'll hear when the coloration stops. that ppoint is the closest your seat can go to the wall. ---incidentally, this technique is part of the WASP setup that wilson uses to great effect, its just that they do the listening test to mark the closest the speaker can go to the wall).

rhyno

My plan is to attack primary and secondary reflections w/ foam panels, build Decware's bass traps and place foam along the walls to the left and right of listening position ear level). The room is very small (11' x 11'6" x 8').

psychicanimal, you'll likely find (as i did) that the foam (aka absorption) @ listening position ear level will take life out of the performance. refract it with an RPG and you'll likely do better (or build your own, as they cost @ $40 in parts).

best
rhyno

I tried it once just for kicks. The system sounded fine in that configuration but I could not overcome the visual stigma of staring into a corner, just too weird.

Rhyno, I currently have six RPG ProFoam Level 1 panels. Three of those are mounted in foam board and placed behind and above my sofa. Like you, my experience of having diffusion behind me is good. I've used the panel in three diferent apartments (I'm a nomad) but now with this diagonal setup things will change. I could setup two foamboard panels but I'm wondering whether other alternatives might be just as effective (and cheaper). I live within driving distance from the Carlo Foam Factory and their prices are good. I've been looking at these two types of panels:

Wall tiles

Pyramid foam

I know these are not as good as the upper ended RPG products but I can't forget I live in a rental townhome. I am aware that the diffusors I am using are two dimensional and thus not as effective. The RPG Skylines are way out of my budget. I wonder which of the two should I use and if both have practical uses, where goes which.

Where's Rives? We finally have a good and interesting discussion of room acoustics. We've not been wanting in the power delivery/noise control lately...

Regarding someone here who could not get used to the empty space, I thought about it. I have purchased quite a number of Kentia palms to be placed between the speakers. Hmmm, maybe my room will be shown in Audio/Video Interiors!