My front 685s are just under 2m apart - I think ideally they should be a bit further apart but this isn't possible for me because of space issues - sounds excellent though. Of course, it will also depend how far away you're sitting, but this sort of distance should be okay for normal viewing distances of 3m or so. I spent a while experimenting with toe in as well and finally settled on them being slightly toed in. In my view, the rears should be a long way apart and ideally placed a little bit above ear height. Mine are either side of the room, but one is quite a bit closer to me than the other due to other furniture placement. As long as they are separated well enough so you can distinctly tell the direction the sound is coming from, the amp will take into account distances and the like for sound effects (assuming it's set up properly) so the distance to your ears doesn't need to be equal.