I would bi-amp. I agree with @knotscott, he gives good advice about passive bi-amping. I have no experience with passive bi-amping, as my speakers can only be actively bi-amp. When I horizontally bi-amped my speakers, with an analog active crossover design by the same manufacturer (of the speakers), it brought my speakers three notches above the passive crossover in sound quality. A good external crossover is very important when actively bi-amping. Also you said you have two amps then just do it, you might like it. 😎
That said, passive or active bi-amping should not be undertaken without first asking the speaker manufacturer’s advice.
Mike

