Originally Posted by J_P_A
I was planning for them to go behind an AT screen wall. I could do baffle wall, but I'm a little concerned about getting the placement just right since the baffle wall would lock me in on the location.
I'm open to suggestions on he placement! Also, I think I'll need to look at the smaller options for the surrounds. A cabinet for a 15" speaker will probably be pushing it for hiding it in a column. Suggestions there?
I understand your concern. I would likely go screen wall myself*, however baffle wall approach certainly brings inherent advantages. And yes, it would lock you in to positioning, but that's no problem. The ground up/blank slate style of your room lends itself to about anything you would want to do.
Flush mounted mains eliminate SBIR related FR peaks and dips generated off the front wall. Also, the departure from free standing, toward halfspace loading will increase the bottom end of the coverage range, this would need some measure of compensation. I'd suspect Audyssey or equivalent shaping would easily tame the additional fullness, but I've never used it that way (fwiw; Seaton has stated this is Audyssey's wheelhouse). Other benefits include no diffraction from cabinet, increasing imaging stability and FR smoothing.
Full baffle wall/flush mounted approach places some additional demands on rear wall acoustic treatments, especially for music. A bass managed multi-location sub system lessens this somewhat, however flush mounting up front typically excites all front-to-back modes. Also, flush mounting mains is exactly that...flush mounted. It's important they must be perfectly flush and even all around. Here's the rub as I see it; The design hallmark of these speakers is the wonderful manner in which they control directivity. Aggressive toe angles in set-up would not be uncommon w/the L&R. This is the only reason I'd be hesitant, because I'd experiment extensively with the coverage pattern and toe angle. This isn't conducive to the premise of the flush mounted approach.
Even though flush mounting is superior, some type of semi open screen-wall may be best. This would essentially allow all the placement changes you'd encounter. Plus, you could incorporate massive absorption/bass damping for very little expense (thick fluffy). You lose the extra SPL that the flush mounting gives you, but those bass managed mains should be fine.
Good luck*I've got a modest, multi-use family room/media room for my HT. If I were building, given the space, I'd employ a quasi screen-wall approach on all walls. Somewhat of a faux wall, studs only, covered in fabric and trimmed in wood, so all treatments ... be it massive absorption, or diffusion/scattering, could easily be implemented with no visual component whatsoever. Thick bass damping all around, then layer on diffusion to taste, to retain MF/HF presence and air.