Trust me ,, i contacted Moon Audio (from where i got it) , Drew Baird himself told me that it is the limit of the Elear ,, he tried it at his store and he had the same issue
also another member here confirmed this problem with Focal at a meeting in CnaJam ,, they said to him , it is the design of this headphone if driven with heavy tracks
the driver hit the protective grill from inside , i wouldn't care for this problem if they sounded good ,i would kept them for relaxed music ,, but even for that it was not at my standers.