High Excursion Design Gathered Edge (H. E. D. G. E. ) rubber surround increases output and low frequency extension ^^ Unique lapel cone shape for high excursion ^^ OPTIM Sync Technology pre-EQ selection specific to each driver (requires 3.0 or newer update on PXE-C80-88) ^^ Polypropylene and Mica Cone Material for increased rigidity ^^ Gun metal chemical topcoat for premium aesthetic