Any one ever replace caps or modify there Xovers

NOTE: I didn't actually say to go ahead and DO the mod.
Parts ain't parts. Caps have a resistive and inductive component.
Inductors? Resistive and perhaps capacitive as well.
Point being?
Changing parts is perhaps a little MORE complex than just matching values and warming up the old iron.
For higher end speakers.......they are 'voiced' which means that, theoretically, at least, parts are chosen for sonic goodness.....relative to the goals and design constraints.
I would gingerly approach crossover mods and be aware that more money doesn't necessarily mean better sound.
As a minor counterpoint to Shay, many designers and 'mod' guys will swear by the 'bypass' cap. Say...you need 20mfd. Well, get a couple 10s or even a single 20mfd cap. Maybe spend a bundle. BUT they will also throw a .01 across in parallel. Something about the HF passing thru more easily......and adding to the quality.
Just a thought.

Shay123, that is awful advice. Manufactures are in the business to make money, do you believe they'd add all those extra parts if they weren't necessary?

As for bypasses, I only find them helpful when dealing with electrolytic caps of large values in shunt positions. In series with the mid or tweeter ruins spacial information and adds artificial artifacts, YMMV.

""12-25-10: Shay123
The more u simplify the crossover, the better it will sound.""

with all respect to all Audiogon members, this statement is ridiculous and similar to statements like "reducing car power gear box from 6 to 1 gears significaly improoves car durability and performance" its true, but this car should be electromobile in kids circus park.