I was listening to a mix of a narration on headphones the other day, and the vocal panned from dead centre, to coming from the left and right side into both ears but with no centre image. Make sense? I thought about this a bit more and either I have a mental block or I'm left thinking how the hell do you do that? Can it be done on speakers? Is it just psychoacoustic - you here the 2 tracks pan outwards and when they stop, you assume there is no centre left? Anybody know what I am on about?