Join Date: Feb 2018
Location: Central Sierra Nevada
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From an audio standpoint, 3 identical vertically orientated LCR speakers is the best bet. Next, I would say is 3 vertically orientated speakers with the same tweeters/midrange and similar woofers. In this case, 2 towers for L&R and a vertical bookshelf speaker for the center will meet that criteria when 3 towers is just not practical from a equipment placement or a screen height point of view. It is certainly better from a dispersion and combing point of view than a horizontal center speaker. And if you are using a subwoofer the bookshelf speaker may be all that is needed. You might look at the RP-600M for a center.
As to what screen height is acceptable, if you tend to sit back in a reclining chair and are not sitting too close to the screen, then 45" is not out of the question if that allows for better audio. It is all about compromise and even acoustically transparent screens have their own compromises, so there is not simply one right answer here.
SONY VPL-VW385ES, Da-Lite 92" 0.9 HD progressive 16x9 screen, Apple TV 4K, HDFury Integral 2, Oppo UDP 203, Panasonic DP-UB820, Anthem AVM 60, D-Sonic 4000 (800x3, 400x4) for bed layer, 2 Crown XLS 1002 (225x4) for Atmos; Speakers: Polk LSiM 705s, 703 front, 4 702F/X surround, 4 Polk TL3 (Atmos), Dual Velodyne DD15 Subwoofers.