Cool, I guess all this phase stuff isn't so hard after all, I've just spent the afternoon reading posts on this forum, and actually learning what you've said.

What would happen on a baffle when the drivers arn't placed exactly above each other? Does the same center-to-center distance apply too? I would think this creates phase issues in the horizontal plane? (unlike when they are orientated one on top of the other, listener-to-driver distance remains constant with all drivers and the listener the same distance). I often see studio monitors etc where the woofer is at the bottom, midrange at the top right, and tweeter at the top left.

Thanks!
Adrian