Crossing Left and Right Speakers

@jimmy2615 

"the instruments were still outside the loudspeakers (but on the wrong side), but to your point what I noticed that surprised me was that there was nothing in the center of the stage, only on the outsides."

That is amazing.... I wonder why. 

That usually occurs when you have the speakers wired out of phase. I know you said they were in phase but just for kicks, humor me, reverse the leads of one speaker and see what happens. :-)

@newbee 

Yes, I was certainly in phase. Let me explain, fisrtly I heard about it on the YT vid and I did some experiments afterward. Agin I am in phase. Just curious how this can be. If anyone knows why or how... makes no lgical sense

Doesn't make any sense to me either. That is why I suggested that you physically reverse the leads on one speaker. Sometimes strange things happen with electronics that aren't predictable. For example I've actually seen the connectors on a speaker mis labeled and cross overs mis-wired. My suggestion was just to insure that everything was connected properly absent any assumptions. Only takes a minute. :-)