Based on my experience, clipping an amp will blow those tweeters every time. Tons of clean power is the key to avoiding damaging those tweeters. I also agree with other posters' comments here that the fuse value should be checked.
I would not even consider powering Magnepans with less than 300 wpc (minimum) if I wanted to play them loud and not risk damaging the tweeter.
I would not even consider powering Magnepans with less than 300 wpc (minimum) if I wanted to play them loud and not risk damaging the tweeter.