I have the 601 series IIs from 1984. It took me years and years to set them up optimally but when I did, the soundstage was superb.
My 501sIV's are from .... hmmmm ... 1987 or so I think. What sort of things did you do to optimize their setup? I may end up sticking them in the tiny bedroom I'll be using for my office if/when I can score me some Axiom love. One day if I finish off all or part of the ground-floor garage for an office / media room the Axiom setup might migrate there and I'd use the Bose/Sony just for music upstairs. My brother is no longer with us so they have sentimental value. MAN I wish the artist who built the place had run conduit for speaker wires...
It would depend on the crossover, I would think.