The Stax SR-Lambda is an electrostatic headphone model produced by Stax, a Japanese manufacturer specializing in electrostatic audio equipment. Released initially in the late 1980s, the SR-Lambda features a unique design utilizing an electrostatic transducer, which offers advantages such as high fidelity sound reproduction, extended frequency response, and minimal distortion. The headphones are characterized by their lightweight construction and comfortable fit, making them suitable for long listening sessions. The SR-Lambda requires a dedicated electrostatic amplifier for optimal performance, as it functions differently from conventional dynamic headphones. Technical specifications include a frequency response typically ranging from 20 Hz to 20 kHz, a sensitivity of approximately 100 dB, and an impedance of 145 kOhms. The headphones also feature a slim and elegant design with replaceable ear pads, combined with an open-back structure that contributes to their spacious soundstage. Users often appreciate the clarity and detail provided across various music genres, particularly vocals and classical compositions.
