The Stax SR-50 is a closed-back electrostatic headphone that combines lightweight design with a comfortable fit. It features a unique electret driver technology, which is notable for providing a smooth and engaging listening experience. The headphone was introduced in the late 70s and has since become a part of Stax's rich audio heritage. Although particularly rare, it is characterized by a warm sound signature with good midrange presence. The electrostatic design contributes to its refined sound quality, making it a desirable choice for audiophiles interested in vintage electrostatic headphones. It offers minimal sound leakage typical of closed-back designs, providing a personal listening experience suitable for private environments.