Speaker separation versus listening distance??


Is there a formula for separation distance between speakers, versus sitting/listening distance?
route30

I would have to agree.Starting of with the equal distance idea is a good place to start.If you have 10'between speakers ,then use 10' of distance to you.This is just to start out with, although a lot of people use this in their final setup.
Agre with previous posts, but have also found this to be a useful guide:

http://www.cardas.com/pdf/roomsetup.pdf
I like the speakers slightly closer in my opinion. Everyones different, and depends on the speakers.