Originally Posted by hockeyrama
I am very curious about the size discussion here.
Personally when we go to a theatre we like to sit dead centre lined up with the centre of the screen if that helps with calculations.
I think 12 feet away would be too close on a 170 inch screen for me and my family and that is saying something as I like it big. I just not sure how big i think one should go.
1.2x screen width for a 16:9 screen is a decent general rule of thumb for people that like it big, and I would sit at least 1.2x back with an Epson LCD (probably 1.3x personally due to SDE). Too close (or max for the die hard) would generally be around 1x screen width, this is about 7.25 feet back for a 100" (most would prefer to be back farther though, generally 9 feet to 10 feet back for 100" ).
Buy the projector before the screen, watch it on the wall for a couple weeks and that is the way to decide how BIG you like the screen. Though the easier solution is if the seats are not bolted in or too heavy, then you can move them closer to the screen slightly as time passes.
You might look at a B-Stock LCOS projector or a DLP like the Benq w1070 for those that like larger screens. The most ridiculous I have seen was I had to sit in the front row at an Imax theater, though it was a tall aspect screen rather than wide like we are used to, still it was horrendous. The front seats were a complete joke it was so close felt like my nose was inside the movie.
The problems with sitting too close are also that the image appears to be a lower resolution, poorer sources like cable TV stand out more, and there is more SDE or visible pixelation. I don't game much, but in some of the PC games I play the text is somewhat unadjustable and very small, in that case I prefer to be about 1.0x back from the screen, but in movies 1.2x to 1.3x is better.
The pixelation and image noise on many of these projectors becomes more distracting even as you move slightly closer to that barrier.