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Thanks for the feedback. Which speakers would you recommend using the false wall approach w/ an AT screen? I had been leaning towards the Reference Premiere (with RP-280 for L/R) or the THX Ultra 2s before the installer recommended in-walls.

I'm in the process of finishing my basement with a dedicated home theater. Dimensions are roughly 23x15x8, but length is flexible since the back wall will be built with the finishing. The builder came back with the initial recommendation for speakers:PRO-6504-L-THX x3 for L/C/RR-5650-S II x4 for surroundsR-2650-C II x4 for AtmosSW112 x1 for subIn an effort to timbre match, satisfy my OCD with a matching line and go for top of the line at the outset, I was going to propose the following: PRO-6504-L-THX x3 for L/C/R (behind the screen)PRO-7800-S-THX x4 for surrounds and back surroundsPRO-7502-S-THX x4 for AtmosKW-120-THX x1 for subI'll have the theater wired for a 2nd sub, but may start with only 1 depending on overall budget. My AVR will be the Yamaha A3070. I plan to use an Emotiva A-300 power amp for the mains, and let the A3070 handle the rest of the speakers (both are 150w per channel). I'm having difficulty finding any reviews for the THX in-walls so I was hoping to get some feedback here. A few questions:1. The description on the Klipsch site has "Diffuse Tractrix® Horn Array" being the difference between the PRO-7800-S and the PRO-7800-L. I assume this is similar to the difference between direct firing (Ls) and bipole (Ss)? Recommendations for which would be more ideal for surrounds and surround backs?2. Similar question for the in-ceiling for Atmos...more ideal to use the S version vs. the L version?My back up plan is to move to the Professional Series Reference Premiere in-walls. However, these are so new I can't seem to find any reviews. Basically, I can just find the announcement.Overall thoughts? Would it be more ideal to move away from in-walls to standard on-wall speakers? Any suggestions that I have not considered. Thanks in advance.