Appreciate the responses thus far. Unfortunately due to room layout, it's totally unpractical for me to place speakers against either of the short walls. I would love to try it someday, but would have to put them back anyway, so maybe better left untried for fear of it actually sounding better.
Tonight I tried moving the speakers into the room as far as practical and fine tuning them in that position, ended up being 6 more inches further from the rear wall. The 3D has improved slightly, but not significantly. I think Bryoncunningham is right -- for me it's going to be a matter of inches. And yes, she has said that.
@Nikturner920 - yes diffusion panels are DIY. The diffusion squares come 12 to a box, very cheap, and fit together like puzzle pieces. Though more professional and costly diffusion panels likely have better results.
I may try removing the TV to see if the soundstage improves. If so, I know that a mounted flatscreen TV could be a viable solution.
Tonight I tried moving the speakers into the room as far as practical and fine tuning them in that position, ended up being 6 more inches further from the rear wall. The 3D has improved slightly, but not significantly. I think Bryoncunningham is right -- for me it's going to be a matter of inches. And yes, she has said that.
@Nikturner920 - yes diffusion panels are DIY. The diffusion squares come 12 to a box, very cheap, and fit together like puzzle pieces. Though more professional and costly diffusion panels likely have better results.
I may try removing the TV to see if the soundstage improves. If so, I know that a mounted flatscreen TV could be a viable solution.