Welcome to our STAX - SR-009D Earspeakers Review, where we delve into the revived icon of electrostatic fidelity from STAX. With its return after years of hiatus, the SR-009D brings cutting-edge MLER technology to audiophiles at a more accessible price point than at launch. Join us as we uncover why this model remains a benchmark in high-end listening.
The SR-009D features a robust yet elegant open-air design. Its large circular diaphragm and fixed electrode assembly are housed in a precision-milled frame, now in a refreshed body colour. Genuine sheep leather earpads ensure comfort during extended sessions, while the surrounding section utilises high-grade artificial leather for durability. At 452g, the earspeakers strike a balance between solidity and wearability.
A highlight is the replaceable cable design, standard across STAX’s current lineup. The 2.5m low-capacity, wide parallel OFC cable can be easily swapped for future upgrades or maintenance, safeguarding your investment and ensuring long-term performance.
Introduced in 2011, the SR-009 pioneered STAX’s Multi-Layer Electrode (MLER) technology. Using thermal diffusion bonding to unify photo-etched metal plates at the atomic level under vacuum conditions, MLER delivers exceptional planarity, minimal resonance and superior sound wave transmission. This fixed electrode architecture lays the foundation for the current flagship SR-X9000 and SR-009S models.
With a frequency response spanning 5 6,000Hz and sensitivity of 101dB, the SR-009D excels in revealing every nuance of a recording. Low frequencies are taut and controlled, mids are transparent and natural, while highs extend with crystalline clarity. The open-air architecture creates an expansive soundstage with pinpoint imaging, making orchestral crescendos soar and intimate acoustic details resonate.
Driving the SR-009D requires a dedicated electrostatic energiser delivering 580V DC bias. When paired with a high-performance amplifier and source, you will experience unmatched dynamic range, ultra-low distortion and a level of musical engagement that sets a new standard for earspeaker reproduction.
The SR-009D is tailored for discerning audiophiles who demand transparency, speed and an immersive soundstage. If you listen to genres ranging from classical symphonies to high-resolution jazz or detail-rich electronic productions, the SR-009D will elevate your sessions. It is also ideal for anyone looking to experience STAX’s high-end sound without stepping up to the more costly flagships.
By reviving the original SR-009 with modern refinements, STAX has created a compelling bridge between heritage and innovation. The MLER electrodes, replaceable cable system and ergonomic earpads combine to deliver a listening experience that is both technically precise and emotionally engaging. At a fraction of its original launch price, the SR-009D offers exceptional value for those seeking the core essence of STAX’s high-end philosophy.
Ready to experience the STAX - SR-009D Earspeakers? Explore the full specifications on our product page, or speak with our expert team at The Audio Tailor on 1300 308 711 for personalised advice. We ship nationwide and offer tailored solutions to match your system and listening space.
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