Originally Posted by devildog1679
So the acoustice fabric would go on the side wall edge?
One way to do this is to use a mirror that you can temporarily stick to the wall, or have someone help you by holding it. Sit in a seat, or seat position, with either the actual LCR speakers in place or with something marking their position. Looking at the mirror, have someone hold it against the wall and move it around until you can see a reflection of the nearest speaker (or place-holder). Mark that mirror position on the wall, and try the same thing sitting in all seats. You'll end up with a group of spots on the wall. Place an acoustic absorber such that it covers all spots plus about 30% more area around them. There are many absorbers available, but the rule of thumb here is the thicker they are, the lower frequencies they will absorb. Everybody likes 1" thick because it is thin and looks good, but thicker is better because it can absorb lower frequencies, so I never recommend much less than 2". Mounting the absorber slightly off the wall will extend the low frequency capability making it act as though it was thicker. No absorber panel will never really do much to absorb bass, though. Think wave lengths. 60Hz has a wavelength of about 18 feet, so a 3" panel is invisible to it. Bass treatment is a different issue, and as much as it should be addressed, it's not the same as the early reflection issue we're talking about here, and needs a different type of treatment. But killing pronounced early reflections of the L and R speakers is very important to sonic imaging, so go for that first. If the position ends up at a point where a picture or decorative graphic might look good, you can get absorbers custom printed with colors, and images, even your own photos. Sometimes that's the best compromise between having an absorber that conflicts with aesthetics and not having one at all.
Some manufacturers, the best ones, will help and consult with you on what you need. The owner of this company hangs out here, good guy, and his stuff is first quality yet affordable. Call and ask them to help you: http://www.realtraps.com
One last thing, don't lock yourself into a subwoofer location until you have your system up and running so you can hunt down the best sub location. You do this by placing the sub in the best seat, then the system playing with good bass content, crawl around the room finding the spot where the bass is best (smoothest, not just strongest), and put the sub there.