I have a pair of Sonus Faber Concerto Grand Piano speakers, so they're a bit aged. I was thinking of getting or doing a crossover refurb. Nothing drastic, just component upgrades. Or should I use the same parts? How hard would it be to do it myself?
Unless there's actually something wrong with the crossover, I caution against changing it at all. If you do, your "upgrade" could actually degrade the speaker. The reason I'm against it is because I know that when good companies design and manufacture speakers, each part is carefully chosen and every unit is tested after assembly to make sure it performs like they want it to. Changing any part could drastically change the performance of the speaker, and with no follow-up testing, you'll never know that what you did actually made it any better. As I said, unless there's something wrong, I wouldn't change anything. If there is something wrong, contact Sonus Faber to make sure it gets repaired correctly.