Will the BBE do stereo three way crossovers?
Yes indeed. The model number "26" signifies a "2 in 6 out" maximum configuration. They also offer a DS-24 and DS-28, 2 in 4 out, and 2 in 8 out as their model numbers would imply. I haven't looked at the other two models close enough to say for sure that the only difference between them is the number of output channels and possible configurations, but it's probably a fairly safe assumption.