The Epirus Elite Master Reference Series is our absolute state of the art design. The purest signal transfer from the purest precious metals including Ultra Pure Solid Core Silver, 24k Gold, and copper. Teflon and air are used as dielectrics. This ground breaking design features Ultra Pure solid core conductors on the scale of a human hair. Incredible speed, transparency, air, micro details, and a sense of performers in your listening room with palpable placement is what you will experience with the Epirus. The XLR version is a true triple balanced design. Proudly hand built in the USA.