Well, it may be that out of phase gives you sound outside your speakers, but what it really does is give you sound centered at each speaker, unfocused, with a hole in the center. So while you can argue it is "wide" let's not pretend it is correct. Carl is right-on with his comments on room treatment. A lot of things can be considered "the best money I spent in my system" ... for me, tube traps et all are certainly on that short list. When I now listen to rooms that are not treated, I hear so much of the room and the reflections and the sound is "muddy" and inarticulate in comparison IMHO.
Widening my soundstage
I can't seem to get my Spendor S-100s to soundstage any wider than the speakers themselves. They're off all walls. Been toed in, toed out, placed on axis, moved, tilted, turned, twisted... Powered by Jolida int. tube amp. Arcam CD. Cardis interconnects. Speaker cables = weakest link = heavy gauge Monster cable copper. Could that be it? Suggested repacements????