Smitty, does the manual specify which terminal to hook which output to? If not, then it's not doing any active crossovering. (No, that's not a word...) Also, if there's no way to specify the bi-amp crossover, it's probably not doing it, and if it is, it's not doing it well.

I'd advise you swap terminals, but that might or might not prove anything. I don't think it would be detrimental to the speakers (since the internal, passive crossover network is still working)

I am the Doctor, and THIS... is my SPOON!