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Hi all, After persevering with a funny L-shaped theatre room for the last few years, I'm finally moving into a better room for my theatre room. This room has its own quirks but will be much closer to a rectangle and will allow me to have much better speaker placement. It's an existing living room so I'm not looking for anything radical with the design, just some advice on key points to have it work effectively for the future. Key details: 6.9m (length) x 5m (width) x 2.45m (height) One set of glass french doors on the main viewing wall, one window on the left wall, one door on the right wall, one door in the back wall, two ceiling beams running across the ceiling at the 2.5m and 5m mark with the beams dropping down approx 230mm, oh and a funny study corner room (which actually works very well for my design which will have a fixed frame screen on castors to slide it out of the way of the french doors). Will be a light controlled room with black blockout curtains, but will be a light and bright living room when not in theatre use. Will be a combo of movies, tv, music and gaming. 140" 16:9 fixed frame screen with acoustic transparent fabric One lounge row of seating approx 4 - 4.5m back from the screen, and perhaps some bean bags around the room as extra occassional seating. Currently 7.1 channel 1080P with a BenQ W1070, but am prepping the room for potentially 7.2.4 down the track with a BenQ W5700 or similar 4K projector. Will probably stay with the 140" 16:9 screen but could transition to a 180" 2.35:1 cinemascope screen down the track if I was feeling really adventurous. Key initial questions: For a 4 - 4.5m viewing distance from screen, should I aim for the projector to be approx. 4.5m back from the screen (within BenQ's min and max specs for a 140" (3544 - 4608mm)? Will I be right with the lense centre point approx 20cm below the ceiling? (Noting beam no.1 drops down approx 230mm and is well in front of the projector). I propose for the top of screen to be approx 350 - 450mm below the ceiling line when in position. If I run 4 x Atmos speakers in the ceiling in future (leaning towards Krix Helix due to their shallow 86mm mounting depth), I assume I will have to run two approx 1.5m in front of my lounge, and then the other two 1.5m behind my lounge to align with Dolby's 90 degree placement? Am I likely to have sound issues with ceiling beam no.2 partially blocking the listening position or due to the speakers not being far from the back wall? Any thoughts on the use of a solid core sliding door for the right side door? Can you get a drop seal for this kind of door to minimise sound leakage? I'm working out wiring now. Some cables will use cable hide strips along the skirting boards while I think I'll need 1-2 runs of cable to the ceiling (for the projector and Atmos speakers) and right wall (for the rear right and rear surround right speakers). Should I be adding any specific cables now to future-proof the ceiling inputs for a projector e.g. 10-15m long HDMI, cat5e, power, displayport? What will be the common projector standard in say 3 years time? Pictures to aid discussion: (note my horribly rough hand drawn plan is not at all to scale!) Random idea for the sliding door: Thanks