Good morning!\n\nI'm in the process of renovating an old Irish cottage, and am setting up a dedicated home theatre in the living room. Mrs TheRealOC has insisted that there will be no bookshelf or freestanding speakers in the room; everything will be flush-mounted in-ceiling or in-wall. I decided to pre-wire for a 7.4.2 speaker configuration while all the stud walls are exposed, and the carpenters are happy to build back-boxes into the stud before the drywall goes up.\n\nUnfortunately, I don't have the budget to hire an A\/V integration specialist (or even the budget to actually get speakers yet), so there will be no opportunity to do listening tests or experimenting with different speaker positions before the back boxes are permanently installed in the walls. To get around this problem, I've talked to @gene about what speakers would work well in this room, then I measured out the WxDxH dimensions of those speakers, and cut out accurately-sized paper placeholders from A3 sheets of paper, and stuck them to the stud walls to get a sense of how they will look in the room. I'm hoping that the back-box positions will be good enough so that any problems can be fixed with the AVR's digital room correction.\n\n\n\n\n\nThe room is approximately\n- 3.95 metres (just under 13 feet) wide and,\n- 3.8 metres long (12.5 feet), and,\n- 2.45 metres (8 feet) high.\n\nTelevision: \n\nIt's a bit messy but the square of green tape is meant to represent a 75" TV (and the smaller green square within it represents a 65" TV) - my feeling is that a bigger TV will dominate the front wall too much. For my testing, I've positioned an old sofa at a distance of 2.8 meters (9 feet) from the TV. This doesn't leave a whole lot of space between the back of the sofa and the rear surround speakers (more on that later), but due to the length of the room, there's not a lot of wiggle room there.\n\nI tried to follow online advice that the center of the TV should be around eye level i.e. about 42 inches (105cm) above the floor level. And while sitting on the sofa, this level is comfortable. But as you can see, that position leaves a lot of empty space above the TV and more importantly, the center speaker is actually hovering in the middle of where the TV would be. (Mrs TheRealOC is set on using a TV so a projector with an acoustically transparent screen isn't really an option :D )\n\n\n\n\n\n\nFront Speakers (Left, Right and Center):\n\n@gene recommended the DALI OPTICON LCR MK2 for the front left, front center, and front right speakers. These are shallow speakers that are mounted on the wall (not in-wall), and I've positioned the paper placeholders (which are the same size as the actual speakers - 285mm x 482mm x 128mm) about 8 feet (244cm apart). So the front left and right and both about 122cm off-centre from the middle of the room, and in this picture, the bottom edge of the speaker is positioned 95cm (37.5 inches) from the floor.\n\nFor the center speaker, I've assumed that the DALI would be flipped horizontally, so I aimed to its tweeter in line with the tweeters in the front left and front right DALIs. This resulted in a centre speaker with its bottom edge positioned 115cm (45 inches) above the floor level, which is where most recommend the centre of the actual TV should be! :D\n\n\n\nAtmos Speakers:\n\nWe selected the Monitor Audio C280IDCs for the two Atmos speakers. I positioned the paper placeholders about the same width apart as the front left and front right speakers (approximately 8 feet or 244cm apart), and positioned at about the mid-point lengthwise (i.e. about 1.9 metres from the TV wall, slightly in front of the sofa). The ceiling is not particularly high (about 2.44 metres, or 8 feet) but I think Atmos should work okay in this room.\n\n\n\nSubwoofers:\n\nFor the subwoofers, I'm planning on using four Monitor Audio IWS-10 in-wall subwoofers. The front two will be on the front wall facing the listener, and the other two will be on the side walls facing each other to blast sound across the room behind the sofa. I've already installed dedicated wall outlets for the subwoofers. These subwoofers are fairly small and square shaped (11 inches x 11 inches). I tried to mount all the subwoofers a bit below ear level (positioned 60cm above the floor level).\n\nThe front subwoofers are slightly closer together than the front right and front left speakers and are also a bit lower down on the wall. The electrician has pre-wired a dedicated circuit in the room, just for the powered subwoofers. There is a dedicated wall outlet at the each corner of the room just for the nearest subwoofer.\n\n\n\nLeft and Right Side Surrounds:\n\nThe left and right side surrounds will be Monitor Audio W280 in-wall speakers. This is a vertically oriented rectangular speaker that is 441mm high and 288mm wide. We've lined them up with the front of the sofa in the side walls. and won't be super high up - about "picture level". In the below image, the bottom of the speaker is just over 150cm (59 inches) above the floor level.\n\n\n\n\nLeft and Right Rear Channels:\n\nThe rear surrounds will also be W280 in-wall speakers, but their placement is complicated by a few things. Firstly the door takes up 1 meter of width on that wall, so (assuming the two rears should be mounted symmetrically) we're forced to that have the rear left and rear right a bit closer together than the front left and front right.\n\nAlso because we're trying to somewhat follow the guidance about the distance from the sofa to the TV (9.1 feet or 2.77 metres), that leaves the sofa right up against the rear wall. So I positioned the rear speakers higher up the wall (about 6.5 to 7 feet high). The potentially bigger problem is that the left rear is very close to where the electrician has pre-wired for lighting cables\n\n\n\nSimilarly, the right rear speaker is very close to large clumps of ethernet and power cabling running into the adjoining comms room, where the A\/V rack is going, which could lead to potential interference on the sound?\n\n\n\nWould be super grateful for advice on these problems -\n\n1) How can I solve the problem of the TV wall? (I think I could comfortably move the TV higher, so that the TV's centre is about 50 inches above the floor level, which would leave enough space underneath for a centre speaker, but then its tweeter would not be lined up with the two fronts)\n\n2) Is my positioning for the front subwoofers okay? (slightly closer together than the front left and front right, and also slightly lower on the wall - their centres are about 60cm above the floor level).\n\n3) Is it a problem that the rear subwoofers are slightly wider apart than the front subwoofers? What do we think about positioning them so that the sound is projected perpendicularly to the front subwoofers?\n\n4) Probably most importantly, how do I solve the problems with the right and left rear speakers?\n\nI've made some YouTube videos, which hopefully give a better sense of the space:\n\n\n\n\n\nhttps:\/\/www.youtube.com\/shorts\/1sw5eSPSAtE\n\nAny advice or insights are greatly appreciated. Thank you!