These Dan Clark (NE "Mr. Speakers") Voce Electrostatic headphones are brand new. They list for over $3000 and I'm selling them at half price because I can't use them with my current equipment. The headphones are excellent audio quality, easily in the same ballpark, sound-wise as the SR-009S and need to be paired with any Stax Style "Pro-Spec" Electrostatic energizer/amplifier (not included). Compatible energizer/amplifiers include any Stax model, any HiFiMan electrostatic energizer, Stax compatible energizers made by MSB, iFI, Woo Audio, the LTA Z10E, etc. 

Features:
88mm drivers for bass that reaches below 10Hz and provides a very wide and large soundstage.
Metal stators for enhanced resolution
Flexible, microphonic-free round silver-plated copper cable with a solid machined Teflon connector cased in an aluminum housing.
Convenient and "clamshell" style zippered, molded plastic storage box.
Durable all metal construction at a featherweight 330gr.
Fully dust-sealed drivers.