[bpape]

PLEASE don't think of it that way. You don't move the seat to fit seating distance. You put the seat where it needs to be and then purchase the appropriate sized screen.

Also, the 1.5 width is a very rough rule of thumb. I prefer to use the 36 degree minimum included viewing angle. Where you go from there depends way too much on screen type and projector quality to make any other assumptions.

Bryan