donkmeister
Novice Member
Hi all, I could do with some advice on ceiling mounting a projector as I've either got my maths wrong, am aiming for an unusually small screen, or I need to consider having the picture further up the wall than I had hoped. This is my first projector install so I might be missing some vital point.
We're shortly going to be gutting our living room, and while the ceilings are down and we're chasing in power cables we are taking the opportunity to do a home cinema installation. Room dimensions are 4.35m long x 3.2m wide x 2.4m high. As we have other rooms in the house where we can do standard TV watching, the plan is that the living room will do double-duty as a sitting room and a cinema. So it doesn't need to be a stealth install, but at the same time I don't want to be packing the projector away after each viewing, or putting a cabinet in the middle of the room. Door and fireplace location limits sofa placement, which means we are putting the screen on the 3.2m wide end wall, with a window on the opposite wall (black out blind to be ordered!) so we can't do a shelf mount.
We need 4k and 3D to play all of our source material and I'm tending towards the native-4K BenQ projectors. These projectors have a 110% offset, which in BenQ's use of offset percentages means a 100cm-tall image from a projector can be aligned with the top edge of the image up to 10cm below the centreline of the lens. A screen size between 80" and 90" diagonal looks to be optimal when I mark it on the wall and imagine watching a film there without having to dart my head around the place. Viewing distance 3.8m from the best seat in the room to the centre of the picture, around 2.9m from the least good.
In a sofa-seated position, my eyes are 100cm from the floor. Looking at our existing arrangement with a TV, the bottom of the picture is about 70cm above floor level and this feels comfortable. So with a 90" screen giving a picture height of about 1.1m, this means the top of the picture would be 1.8m from the floor. With maximum offset the centreline of the PJ lens is at 1.9m, and therefore the projector mount would need to hang down approx 40cm from the ceiling. If I go for an 80" screen then that increases to approx 50cm (NB these are rough numbers, I've not calculated the exact numbers)
Does that sound about right? 1.9m from the floor seems like a bit of a dangly projector prone to knocks from heads. The BenQ offset seems fairly typical (there is an Epson with a bigger offset but it's "faux-k"), so do I have an unusually small screen in mind or do ceiling mounters just set the picture a bit higher up the wall than my maths anticipates?
We're shortly going to be gutting our living room, and while the ceilings are down and we're chasing in power cables we are taking the opportunity to do a home cinema installation. Room dimensions are 4.35m long x 3.2m wide x 2.4m high. As we have other rooms in the house where we can do standard TV watching, the plan is that the living room will do double-duty as a sitting room and a cinema. So it doesn't need to be a stealth install, but at the same time I don't want to be packing the projector away after each viewing, or putting a cabinet in the middle of the room. Door and fireplace location limits sofa placement, which means we are putting the screen on the 3.2m wide end wall, with a window on the opposite wall (black out blind to be ordered!) so we can't do a shelf mount.
We need 4k and 3D to play all of our source material and I'm tending towards the native-4K BenQ projectors. These projectors have a 110% offset, which in BenQ's use of offset percentages means a 100cm-tall image from a projector can be aligned with the top edge of the image up to 10cm below the centreline of the lens. A screen size between 80" and 90" diagonal looks to be optimal when I mark it on the wall and imagine watching a film there without having to dart my head around the place. Viewing distance 3.8m from the best seat in the room to the centre of the picture, around 2.9m from the least good.
In a sofa-seated position, my eyes are 100cm from the floor. Looking at our existing arrangement with a TV, the bottom of the picture is about 70cm above floor level and this feels comfortable. So with a 90" screen giving a picture height of about 1.1m, this means the top of the picture would be 1.8m from the floor. With maximum offset the centreline of the PJ lens is at 1.9m, and therefore the projector mount would need to hang down approx 40cm from the ceiling. If I go for an 80" screen then that increases to approx 50cm (NB these are rough numbers, I've not calculated the exact numbers)
Does that sound about right? 1.9m from the floor seems like a bit of a dangly projector prone to knocks from heads. The BenQ offset seems fairly typical (there is an Epson with a bigger offset but it's "faux-k"), so do I have an unusually small screen in mind or do ceiling mounters just set the picture a bit higher up the wall than my maths anticipates?