The Aperion also allows (passive) bi-amping, though the forums seem to suggest that isn't worth much.
Just a passing note on this... without getting into the presumed merits, or lack thereof...
I spoke with two speaker designers in my quest, both of whom occasionally put 2 sets of binding posts on their speakers for bi-wiring, which I thought was interesting as that is one concept usually met with absolute rejection of having any value. When asked about it, and passive bi-amping, both replied similarly saying that they don't want their speakers bi-amped and that there is no value in bi-amping whatsoever. Where it got interesting is that one said he's ok if people want to bi-wire, though he felt it, too, didn't really do anything. The other designer was all about bi-wiring and seemingly encouraged it if I wanted... for the cost of an extra set of Cardas Binding Posts, marked up of course.
There was a video
here where Gene says the opposite, that he
could here a slight difference in passive bi-amping (with some caveats), but that bi-wiring is just a sham.
I like most where he ends, though, saying if you have well made speakers, putting a good strong amp on them is all you need to enjoy great sound.