Stax SR-003 II In-Ear Electrostatic Earspeakers: Reference Detail in a Portable Form Presence The SR-003 II brings Stax electrostatic precision into a compact in-ear format, offering a direct and intimate listening experience. You gain the essence of full-size electrostatic performance in a design that sits discreetly and comfortably, delivering high-resolution sound without visual or physical bulk. Design Stax engineers the SR-003 II with the same principles that define its full-size earspeakers. The ultra-light in-ear housings prioritise speed and transparency, allowing music to flow without obstruction. Every element focuses on preserving signal purity and delivering a direct connection to the recording. Driver System Electrostatic ultra-thin diaphragm technology sits at the core of the SR-003 II. This design reacts instantly to electrical signal changes, producing exceptional transient accuracy. You hear fine detail emerge effortlessly, with micro-information preserved across the entire frequency range. Performance The SR-003 II delivers remarkable clarity and speed. Bass response remains tight and articulate, midrange content carries natural presence, and treble extends with air and precision. You experience an uncompressed, highly resolved presentation that reveals subtle layers within familiar recordings. Imaging Soundstage performance exceeds expectations for an in-ear design. Instruments and voices separate cleanly, creating a structured and coherent spatial image. You perceive depth and layering that maintain a strong sense of musical organisation, even within a compact listening format. Synergy These earspeakers require a dedicated electrostatic energiser to operate correctly. When paired with a compatible Stax driver unit, they unlock their full potential, delivering a performance that combines portability with reference-grade electrostatic accuracy. Experience You gain a highly revealing listening tool that strips away unnecessary coloration. The SR-003 II suits critical listening sessions where detail, timing, and transparency matter most, offering an uncompromised view into the recording. The SR-003 II delivers electrostatic precision in its most compact form, combining speed, clarity, and transparency in an intensely revealing listening experience. Feature Specification Type In-ear electrostatic earspeakers Driver Principle Push-pull electrostatic ultra-thin diaphragm Frequency Response 20 Hz – 20 kHz Bias Voltage 580 V DC (PRO bias) Sensitivity 100 dB / 100 V RMS (system dependent) Impedance Capacitive electrostatic load Cable Fixed ultra-lightweight OFC cable Connector Stax 5-pin PRO bias (via energiser) Recommended Energiser Stax dedicated electrostatic driver unit Design Open electrostatic in-ear transducer system Weight Approx. 12 g (excluding cable)
