Bummer buddy.... glad SVS is taking care of it for you... they are truly a great company, and take care of their customers...
I have not had one issue with the MTS's... they have been bulletproof here since I have had them. I have a feeling it wasn't a power related issue here, just a bad tweeter. Otherwise all the tweeters would have smoked as well.
Its a man made product, nothing is faultless...