A lot of the pre-owned Thiels one sees here and on eBay share the "dimpled driver" syndrome as do many other makes. The pair I purchased a year or so ago from a fellow member and the sole owner did not suffer from the malady - and they're perhaps thirty years old.
The advice of getting in contact with Thiel for a rebuild - if necessary - is well given. A previous pair of my 3.5's suffered a midrange tear in the surround that I found necessary to send off to them. I believe the total with shipping back an forth was around $400. That may strike many as a somewhat pricey repair, but it is actually a minor investment in a product that is worthy of it; the quality and sonics of this brand compare very well to competitive brands way up the food chain.
Fix 'em if you have to but keep 'em!
The advice of getting in contact with Thiel for a rebuild - if necessary - is well given. A previous pair of my 3.5's suffered a midrange tear in the surround that I found necessary to send off to them. I believe the total with shipping back an forth was around $400. That may strike many as a somewhat pricey repair, but it is actually a minor investment in a product that is worthy of it; the quality and sonics of this brand compare very well to competitive brands way up the food chain.
Fix 'em if you have to but keep 'em!