gs5556 , I've owned my 3.6's since 1993 and still love the sound they produce. I did have to have the midrange and tweeter repaired on one of the speakers at different points. The midrange had a problem where something failed and thin wires kind of unwound and were protruding around the base of the phase plug. I took it to Audio Consultants where I had purchased it and they took care of having the driver repaired by Thiel and reinstalled. That was about in 2003 or so. A few years later the tweeter in that same speaker pretty much fried. I spoke with, I believe it was Rob at Thiel and sent the tweeter in for rebuilding. He called me a few days later and we talked about what may have happened He said the driver was pretty badly damaged and I mentioned the type of music I listen to. Contemporary Folk..basically acoustic guitar, vocals, that type of music, and nothing at any levels that are apt to over drive a tweeter.
He sent me back the rebuilt tweeter, but had me do a test before I reinstalled it. He said that they had had an issue with a specific component of the crossover failing, that would send a full range signal through to the tweeter. He had me do an ohm meter test on the resistance being supplied by the crossover to the tweeter inputs. He said it should be 20 ohms. Mine was .1 ohms, that's point 1 ohms....basically a dead short. That's why my tweeter blew, and the rebuilt one would have blown as well had I hooked it back up without having the failed crossover component replaced first.
Rob knew exactly which component in the crossover needed to be replaced and I had that done, and the tweeter has worked perfectly ever since.
I do have two other systems in the house, both with Magnepan speakers, but my main system still has the Thiel 3.6's and I have no plans to replace them.