Replacing drivers in Sonus Faber speakers..anyone?

Most Drivers pretty much last a long, long, long time except if they have foam surrounds which deteriorate over time.   Foam surrounds can be replaced and fixed at minimal cost.  If Rubber surrounds get hard, those can also be replaced and fixed, again cost is minimal. 

Drivers are only seriously damaged if you blow the voice coil because of amp distortion or playing them way higher than their rated output. 

@hjdca 

+1

Sonus Faber had drivers custom made for the Guarneri Hommage through the 1990’s and early 2000’s. The woofers were probably made by SEAS in Norway. So, there is unlikely a replacement. 

There are appliances (i.e.: silicone oil) on spray cans to maintain/freshen up plastic and rubber surfaces in cars, which you could apply on a soft cloth and gently clean the polypropylene cone and rubber surrounds on the GH's, after they've been dusted off. This will also prevent the rubber surrounds from hardening up and keep them supple. Leave the dome tweeters alone, other than some very gentle dusting off with a very soft brush. Once treated (i.e.: the woofer/mids) I wouldn't worry about the age of the drivers. 

Lovely speakers, btw. 

I wouldn’t replace any drivers unless they’re problematic, and even then it’s better to repair than replace, as they’re proprietary to those speakers.

You could rotate the woofers 180° to offset the effects of gravity over the years,