what are peoples experiences with these? There is a pair in the studio at my school, and they sound decent, but they have been troublesome. They seem to blow speakers easily. We just got I new pair for this semester, because one of the old ones had blown something, and already one of the tweeters was blown on the new one, so we switched it out with the old one, and it was fine. Maybe it was just a mixup. Has anyone else had problems with these?