HELP Speakers sound brighter and 3D stage is lost

Your post doesn't make sense: you have your speakers 6 inches from sidewall and 8 feet in between, but the shortest dimension of the room is 12 foot? My math says 3 feet is unaccounted for. 8' feet apart and 4' from sidewalls is about perfect, as far as time delay and width for stereo are concerned. At a minimum, fight for 2' from the sidewalls to get a crude 4ms delay (is that right guys: two ms out and two ms back). A little toe in wouldn't hurt and if they have to be close to the sidewalls, a 2foot by 2 foot of acoustic foam at the first reflection points will clean up the high beaming/harshness a bit.
Try the RPG profoam level 1 from audioadvisor.com for a quick and dirty easy route.

silentsource.com
aurlex.com
also good places.

Ezmeralda, i thought the same thing. The measurements are probable from the insides of each speaker in terms of spacing, then you have the width of each speaker cabinet ( which might be appr a foot and a half x 2 ) and then the distance from their outer edges to the wall. Make sense ? Sean
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Follow these directions from Audio Physic to get your soundstage back ...

http://www.audiophysic.de/produkte/aufstellung/aufstellung_e2.html

A subwoofer might help ... I use a Rel strata in a room which is only 10x12.

But first I'd play with positioning and listen in the nearfield.

Regards
Sean

The above suggestions are all excellent, but (and I hate to bring this up) I wonder whether those speakers are just plain too large for your new room, both physically and in the bass they produce. A smaller, stand-mounted speaker (for example, B&W 805Ns) might be able to give you much of your imaging and soundstaging back, as they would enhance the possibility of nearfield listening, and a good sub, if necessary, could add any bass you felt was missing (in a small room, you really may not miss the additional bass the 802s produce). If your speakers are new, any way your dealer can make this happen without a loss to you? Otherwise, I'd suggest setting them up on the long wall and adopt a nearfield listening spot to get back your soundstage, although I think you may have some bass problems depending on how close to the back wall you have to sit. Can't help you on the brightness, I agree with Buckingham, I find B&W's bright, but that's a personal bias and maybe breakin will ameliorate the problem. Good luck!

I think he means six inches from the back wall, not the side walls???