Avalon mid-range driver burn-out

Has anyone experience a burn out of the mid range drivers of Avalon Edilon?
They can shatter under certain circumstances but don't seem to wear or burn out.
Hello Alleung,

If you are talking about little light brown spots on the ceramic mid drivers don't worry about it. This happens over time of normal use of the speakers and does not have any negative effect on the sound. Enjoy!