Anyone ever try this? Since my Magnepans have an external crossover, it was very easy. I use a Krell KAV-250A for the bass and a Classe CA-200 for midrange/treble. The active crossover is a Marchand XM-9.
I really felt that the Maggies opened up relative to a single amp and using the passive crossover.
The one challenge was that the crossover is only single-ended and I was experiencing a lot of noise/interference with the interconnect from the preamp to the crossover. Finally I found a Henry Engineering Matchbox HD so that I could use a balanced connection that rejected all of that noise and then fed a single ended connection to the crossover. Now it’s dead silent!
I would encourage such tinkering. Sure, maybe it is not that different from just upgrading amps, but I really like the extra control I get by using the crossover and the gain pots on it. Gave the Maggies some new life!