Thanks for the good advice. I'd really like to give this quad thing a try. The Minimus are still standing by but Sansui warns not to include any 4 Ohm units when going A+B. The Stasis owners manuals state likewise. But yep, I wouldn't scoff at a good deal on a top of the line Nak SR-4A.
Back in the 70's I experienced a quartet of Big Advents positioned like compass points with the listeners corraled inside a central field. It was fascinating the one time I heard it. My practical side says just get another set of Minimus and get it over with. But since the a/d/s/ came along it would be heart breaking not to integrate them somehow.
Sansui made a rear channel amp that solves the overload problem and offers user selectable quad technology. On the plus side its got four needle meters which look like fun. But its chromey early 70's cosmetics are tough to take with what I've already got. Something will work out. Meanwhile I'll count my blessings until the right stuff comes along.