The Stax SR-Lambda Signature is a pair of electrostatic headphones launched in 1987 as part of the Signature Series, which also includes the SR-Λ Pro model. These headphones utilize a unique design that features a diaphragm made of high-polymer material, only one micron thick, which contributes to their exceptional sound reproduction capabilities. The headphones are driven by a specific electrostatic amplifier due to their unique transducer design. The SR-Lambda Signature headphones have a stated operational voltage of 580 V DC. The cable employs PC-OCC, a special type of pure copper, which helps in maintaining signal integrity. They are noted for their detailed and fast sound reproduction, excelling in soundstage accuracy with well-layered imaging. The audio performance is characterized by a linear and textured bass response along with a relaxed midrange and airy treble, though some listeners feel the low-end could use more weight. Overall, the SR-Lambda Signature headphones offer remarkable detail resolution, making them a favored choice for critical listening across various genres of music, although they may not suit those looking for heavy bass response.
