ATM I'm listening to Donald Byrd's "Here Am I" and the trumpet it clearly coming from well to the left of my left speaker. The sax, piano, percussion and bass are all coming from within the apparent soundstage, that is to say generally within the range of the two front speakers. But the trumpet is clearly outside of it. This isn't even possible, is it?
I have an auxiliary 'fill' pair behind my listening area. I presume this is the cause? Whatever it is, it's cool.