I use the Marchand XM-9, and it is available as a two or three way design. It isn't the easyiest one to change frq with, but they may have another model that would allow you to change on the fly. I have been very pleased with their products, and their service is top notch.
Electronic crossover recommendations
I need some help finding the best electronic crossover. I am looking to experiment with going active to a few different speakers. I am going to use it on commercial speakers, and some DIY speakers. I need it to be able to be used on ANY 2 or 3 way speaker. Flexibility is really important. I am really looking for only top notch ones. I keep hearing that active is the way to go, so I thought I would give it a try. If you have used one or know of one, I would appreciate it if you can drop a line or two about it. thanks