I can't speak to most of the crossovers mentioned in the thread. I use a Bryston 10B two way analog crossover with Magnepan 1.6's and 2 Arcam 10P 2 channel amplifiers. I removed the speakers passive crossovers and rewired the speaker panels to the binding posts. I was able to pick up the crossover and second amplifier used. IMO, it was time and money well spent. It really opened up and cleaned up the sound.
The Bryston 10B is not as flexible as some of the digital crossover versions (i.e. - limited in slope and crossover point selections, and no room correction) but matches very well with the Magnepans as what choices are available with the Bryston are close to what the original passive crossovers were. I ended up liking different settings more than those matching the original passives.
I believe the Bryston and Pass analog active crossovers are still available and I see them used on rare occasions. Good luck with your project.
JS
The Bryston 10B is not as flexible as some of the digital crossover versions (i.e. - limited in slope and crossover point selections, and no room correction) but matches very well with the Magnepans as what choices are available with the Bryston are close to what the original passive crossovers were. I ended up liking different settings more than those matching the original passives.
I believe the Bryston and Pass analog active crossovers are still available and I see them used on rare occasions. Good luck with your project.
JS