Magnepan ribbons only have a reputation for "blowing out" if they are driven with amplification not up to dealing with a load of 4 ohms that is 85db (in)efficient. In twenty years of using Magnepan loudspeakers (SMGa, MGI, MGIII, MGIIIA, MG3.6R) I have never had a ribbon go. The SMGa and MGI did not have a ribbon tweeter. A few fuses maybe but not ribbons. The rather exposed ribbon on the 3 series is very sensitive to how it is protected when the speaker is boxed, shipped, moved etc.
