STAX energizer
A STAX energizer is a specialized amplifier designed to power STAX electrostatic headphones. Electrostatic headphones require high voltage (580V) to operate properly, which traditional headphone amplifiers cannot deliver. Therefore, an energizer is used to convert the signal from a standard amplifier to the necessary voltage levels for electrostatic headphones.
STAX's amplifiers can also be used to drive other electrostatic headphones from, for example, KaldasResearch, Audeze CRBN, HiFiMan Jade 2 and others.