Biamping is definitely a good thing. I always do dilligence in designing a good passive crossover, because I think that's still the most popular way speakers are used. I want people to be able to use the speakers with a typical receiver or amp, and not need an active crossover and amps to to them. But if you have the gear, it's great to run 'em that way.I wonder which would be better, a passive crossover with Auricaps and large pure copper air-core coils or an active analog crossover with generic electrolytics and low-cost op-amps. Or a digital crossover with ADCs and DACs. With active crossovers, you have the benefits of reduced bandwidth in each amp but there is added complexity in the system overall. A digital crossover can easily set delay for any channel, a definite plus for people running basshorns. Lots of variables to consider.
On a similar note, I've been using Keith Larson's new WTPro/ST system which uses DSP to create filters from Spice files. It's like having a Spice parser that sets up an active crossover for testing. It's a great tool for crossover design work!
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