VOCE is Dan Clarks' electrostatic headphone. VOCE is designed to deliver electrostatic clarity, a powerful bass experience, and an expansive soundstage. It's compatible with all Stax Pro (580V) bias amplifiers. Key features include: 1) 88mm driver for extended and rich bass that reaches below 10Hz 2) Advanced metal stators for enhanced resolution 3) Flexible, microphonic-free round silver plated copper cable with a solid machined Teflon connector with an aluminum housing 4) Convenient and attractive walnut storage box with built-in headphone stand 5) All metal construction, less than 330gr 6) Tuning filters for a customized listening experience 7) Field-serviceable driver module 8) Fully dust-sealed drivers Important notes on electrostatic headphones: -Electrostatic headphones must be used with an appropriate electrostatic amplifier or energizer (energizers connect to the outputs of a loudspeaker amplifier) to operate. -Many electrostatic headphones make a "zip" sound when the headphone is put on or removed. This is the sound of the charged driver touching the stator, and due to the electric fields, sticking briefly to it before releasing. Due to VOCE's very large driver size the driver may be more prone to this than some other electrostatic headphones. As the stator is insulated this will not cause damage to the driver, and should be considered normal operation.