D....
the basic rule of thumb
- space speakers about 60% the distance that your head will be from them.
for example, if your listening chair is 10' away then your speakers should be 6' apart. This isn't a solid rule, but a good place to start.
It helps to have two people. one to move the speakers while you sit there and listen.
step one:
have person space speakers until you get a "whole in the middle", once you notice that, you've gone too far. back them up until that goes away.
move speakers away from back/side walls until you get the desired amount of bass (the closer to the walls, the more bass reflection).
"toeing in" is simply tilting the speakers inward (so they are not facing straigh ahead).
I found that those B&W's sounded awesome spaced about 5' apart and toed in about 5". what you do is measure the distance to each front corner. move the inside corner back 5". ie: 20" on the outside corner and 15" on the inside. do it for each speaker so they are the same distance from the wall. Again, it helps if someone else does it while you listen. You'll know when they are aligned just right.
try them facing straight at you first before toeing them in so that you can hear the difference. not all speakers need to be angled like this. it depends on a lot of acoustic factors in the room, but you'll find that the stereo image snaps into focus when you do it.