KEF 104/2 Ref: Needs new crossover and drivers

Why? If they are working OK, you are unlikely to improve them by swapping drivers and networks that were not designed for the particular enclosures. If they are not working, your best bet for performance integrity is exact factory replacements.

Amen to kr4's comment. A great loudspeaker when working as it should, and a hard speaker to hurt if not abused. Unless all the drivers are damaged, I don't see how it could even be cost effective. What is the extent of the damage?

Some of the drivers have some rot, but as you all know these speakers are remarkably veiled in their presentation. I understand that generally speaking replacing drivers are not recommended. But I was hoping to use an updated driver from KEF with a crossover made specifically for the newer driver, using better parts. The speaker is for my spare room and instead of selling it, I was hoping to improve it's sound. I have some SET tube amps that are remarkably reveiling of any equipment up or downstream.