Originally Posted by joe277 /t/1518217/front-screen-wall-help#post_24372456
I think you'll be fine building the "cabinets" on the side. There's always a chance that it causes some sort of issue with the sound, but if you have it professionally calibrated or if your AV Rec has good calibration in it then you'll be fine. The area behind the couch will cause more of an issue than the side "cabinets" would.
Are you placing the front speakers ON the cabinets that house the Subwoofers? That would be probably not be the best placement for them since the subs will have some vibration when in use.
Originally Posted by Bacon13 /t/1518217/front-screen-wall-help#post_24374480
If you are using the SEOS 12 Tempest as your center channel, make sure you make the cabinet short enough so it can stand vertically. With that waveguide tweeter, you don't want to lay it sideways as you will have a large vertical dispersion and almost no horizontal, meaning you will have a very narrow sweet spot.
As for the sidewalls, I would make them not as deep as your center cabinet. Or at lease have the front of the speakers sitck out past the walls. If the speakers are set back at all, you will get some weird sound reflections off the sidewalls.