Welcome to our STAX - SR-003 MKII Portable In-ear Earspeaker Review, where we delve deep into the intricacies of STAX’s remarkable canal-type, push-pull electrostatic design. This review will highlight the SR-003MKII’s ultra-thin diaphragm, PRO bias code compatibility, and its ability to deliver high-fidelity audio on the move. For complete specifications and to explore pricing, visit the internal link: STAX - SR-003 MKII Portable In-ear Earspeaker.
The SR-003MKII inherits the DNA of the S-002, boasting a diaphragm film that’s approximately 15% thinner and lighter. The reduced mass translates directly to faster transient response and lower distortion, unlocking micro-detail retrieval that rivals full-size electrostatic earspeakers. With a sound pressure sensitivity of 110dB/100V r.m.s. at 1kHz and a frequency response of 20Hz to 20kHz (±4dB), these in-ears reveal every nuance – from the whisper of a bow on violin strings to thunderous orchestral climaxes.
Compatibility is seamless thanks to the 5-pin STAX PRO bias code, enabling direct connection to any driver unit equipped with a PRO bias output socket. The 6-core parallel cord spans 1.5m, offering generous reach without compromising signal integrity. At just 38g including the code (12g per earpiece), the SR-003MKII is a travel-friendly companion for high-fidelity sessions anywhere you go.
STAX has thought of every detail: the earpieces come with three sizes of silicone ear tips (L/M/S), with medium pre-fitted for most ears. The ergonomic overhead-arc design, weighing just 15g, ensures a snug yet barely-there fit. Its canal-type construction not only improves isolation but also stabilises the earspeaker for extended listening sessions without fatigue.
The SR-003MKII presents a neutral tonal palette characterised by pristine mids and crystal-clear highs. The push-pull electrostatic driver offers spacious sound staging and pinpoint imaging, delivering a coherent sonic picture across genres. Bass is tight and controlled, providing enough weight for rhythm-driven tracks without overshadowing the midrange. Crescendos emerge with lifelike swell, while silence between notes is absolute, thanks to the inherently low distortion of electrostatic transducers.
If you’re an audiophile seeking reference-level sound in a portable form factor, the SR-003MKII is tailored for you. Ideal for field recording engineers, classical purists and high-res streaming enthusiasts who already own a STAX PRO bias driver unit, this earspeaker bridges the gap between studio-grade performance and mobility. To discuss whether the SR-003MKII suits your setup, speak with our expert team at The Audio Tailor on 1300 308 711 or email sales@theaudiotailor.com.au.
The STAX - SR-003 MKII Portable In-ear Earspeaker is a masterpiece of electrostatic engineering miniaturised for on-the-go listening. Its combination of lightweight design, exceptional detail and airy soundstage sets a new benchmark in portable audiophile gear. To experience the SR-003MKII first-hand or to design a custom portable rig, contact our team at The Audio Tailor today – we’re here to personalise your journey to sonic excellence.
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