Guys,
I've had nothing but difficult, assymetrical rooms, and as Doc says, start with the front wall, and the first reflection points, but after that the thing I have found to work by far better than anything else is diffusion panels instead of absorption. And you can do an awful lot with just a few panels -- I've typically found them to be best behind or off to the side of the speakers, and one overhead on the ceiling.
The only other thing that worked, but I eventually abandoned as it was just cumbersome, was a diagonal room setup. But of course my rooms have all been fairly small, so I was pretty limited in how far out into the room I could pull the speakers.
Drew, I'd deefinitely go with that diffuser panel first -- it will also give you something to build ;-).
I think there was a post in the speakers section by another guy here who had a similar issue with his Lowther speakers and found a homemade diffuser panel to do the trick.
I'm starting out on my new room with the Michael Green RoomTune pack, but I will probably still need a diffuser or maybe two at some point. This room is asmall, so I'm pretty cautious about over damping the room with too many absorption panels. I'm certainly no expert in this, but I do have a good amount of experience playing around with small assymetrical rooms, and have been able to achieve some incredible listening spaces where the room walls virtually are not there and with amazing soundstagging... but it tookk a whole lot of time and experimentation and super critical speaker placement as well -- and the speakers were in a perfectly parallel stance when all was said and done.
-- Jim
Jim Rebman -- recovering audiophile
Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).
s.e.x. 2.1 under construction. Want list: Stereomour II
All ICs homemade (speaker and power next)