@HAL - I read your megaliths thread. Very impressive project. I think a little beyond what I want to attempt at this point, and I already have a lot invested in a more conventional approach with a nice DAC, analog preamp, etc.
At some point, I may experiment with using an active crossover and bi-amping, but that's definitely down the road a ways. In the mean time, I'm trying to build the best quality passive crossover I can using Danny's design and guidance.