Yes, the Heil tweeter begins at 850 Hz, and goes up to, well, I don't know exactly, but out of my hearing range. I imagine they rated them to 20k. Amazing upper-mids, crystal treble. But, perhaps because of that mid-range crossover point, the Heils did not have quite the lower-mids that the Ohms have. It's possible I'm not used to hearing that, and that's why the Ohms sounded a little fat down there.
As for bass, yes, that switch is a big help. Mapman, I read your discussion about the SubDudes. I, too, wonder if they'd work with these cabinets. This is the old pyramid cabinet, and it has a set of casters on the bottom. Do you guys have those on your speakers? My floor is a suspended design, carpeted plywood over two-by-fours, over a crawl space. My TT will pick up footfalls if I'm not careful.
It would be nice to find an affordable solution. If anyone has any suggestions, I'd love to hear them.