As an M50 owner, I must say:

"Leave the 50's alone!"

I love 'em just as they are...

I bet such a 3-way speaker would be more expensive than the M50's, since the cost difference of a 5.25" driver vs. the 6.5" driver must now include a more complicated crossover design.

- JasonEuc M50's, CC370, M3's, Rotel RSX-965, Integra DPC 7.5, Harmony 688