Talked to Tom Hidley once and he recommended that i change the ribbon tweeters on the TADs i had every 12 months!
Actually, used the NS 10's way more than the TAD's which were relegated to hideously expensive client pleasers...(FM acoustic amps!!)
NS 10 tweeters have blown out on me a few times.. the rubber mounting on one of a set of Tannoy soffit woofers developed a tear..and i must admit to not having noticed for a few days
But best of all was using a pair of JBL control 5's that had been stored in the attic for more than 2 years.. they appeared to be in perfect condition, but upon "pumping it up" (as you Americans like to say) the woofer mounting shattered and sprayed shards of brittle rubber across the room.
And don't let cats anywhere near uncovered auratones..there's something about the smell of the glue that hits them like catnip...scratch..scratch.