In 1991, Sennheiser released the original Orpheus. At the time, they were claimed to be the best headphones ever made. The new Sennheiser Orpheus Headphones bring back the nameplate and the world-beating performance. The electrostatic headphones are designed to work with the included tube amplifier and DAC to deliver unrivaled sonic reproduction, with the amp seated in a glass housing, on a solid block of Carrara marble, and using four channels in parallel for both the right and left side for increased accuracy. To further reduce distortion, the headphones have a pair of Cool Class A MOSFET amps integrated into the ear cups to eliminate the reactance of the cable and deliver a dynamic range of 8 Hz to more than 100 kHz, as well as the lowest distortion ever measured in a sound reproduction system.