STAX - SR009S Earspeakers Review – If you’re seeking the ultimate in electrostatic headphone performance, look no further than STAX’s flagship SR009S. At The Audio Tailor, we believe this model truly redefines what detailed, transparent listening can be. Read on to discover why the SR009S belongs at the top of any audiophile’s wish list.

Stunning Craftsmanship and Design

The SR009S is built around an aircraft-grade aluminium chassis, machined to micrometer precision. Every contour, from the polished earcup assembly to the 10-step adjustable arc headband, has been engineered to minimise resonance and maintain structural rigidity. The earpads—featuring genuine lamb leather and high-grade synthetic surrounds—offer hours of fatigue-free listening.

Electrostatic Innovation: MLER 2 Technology

At the heart of the SR009S lies STAX’s advanced MLER 2 (Multi‐Layer‐Electrode) system. Gold-plated, high-mass electrodes reduce unwanted resonance while the newly smoothed etching on each aperture lowers air resistance, dramatically improving transparency and transient speed. Pair this with the ultra-thin engineering plastic diaphragm and you’ll hear micro-details that most headphones miss entirely.

Exhilarating Acoustic Performance

• Frequency Response: 5 Hz–42,000 Hz ensures both subterranean bass impact and ethereal airiness in the highest registers.
• Push–Pull Open Back Design: Delivers a natural soundstage, with pinpoint imaging and depth that rivals speaker playback.
• Sound Pressure Sensitivity: 101 dB/100 V r.m.s. at 1 kHz, providing effortless dynamics and headroom.

The SR009S communicates emotion, from the hushed intimacy of solo piano to the raw power of full-scale orchestral climaxes. Transient response is nothing short of astonishing—the headphone faithfully follows every nuance, allowing you to trace each instrument’s articulation in space.

Premium Cable and Connectivity

The bundled 2.5 m cable is crafted from 99.9999% (6N) oxygen-free copper, silver-coated and laid in a low-capacitance, six-strand parallel structure. This ensures maximum signal integrity and phase coherence across the entire frequency spectrum. The SR009S requires a dedicated electrostatic energiser (bias voltage 580 V DC), so speak with our team to confirm compatibility with your current system.

All-Day Comfort

Despite its high-tech internals, the SR009S remains surprisingly lightweight (just 1.3 lb with cable). The new earpads and 10-step arc adjustment allow a personalised fit, accommodating a wide variety of head shapes. Whether you’re on a marathon listening session or conducting critical analytical work, comfort is guaranteed.

Who Should Consider the SR009S?

The SR009S is tailored for discerning audiophiles who demand a combination of pinpoint resolution and musicality. It’s especially suited to:

• Classical and jazz enthusiasts seeking lifelike ambience.
• Mix engineers and mastering professionals requiring absolute neutrality.
• Detail-oriented listeners keen to explore every layer of their favourite recordings.

Pros & Cons

• Pros:
  • Unparalleled clarity and micro-detail retrieval
  • Massive 5 Hz–42 kHz frequency range
  • Exquisite build quality and ergonomic design
  • High-purity 6N silver-coated cable for optimal signal transfer
  • Comfortable lamb-leather earpads for extended sessions
• Cons:
  • Requires dedicated electrostatic energiser (bias voltage 580 V DC)
  • Premium price point reflecting flagship status

Experience Electrostatic Excellence

If you’re ready to elevate your listening journey, the STAX SR009S Earspeakers are waiting. Visit the product page for full details and pricing: STAX SR009S Earspeakers. For personalised advice and system matching, call our team on 1300 308 711 or email sales@theaudiotailor.com.au. We’re here to tailor your perfect HiFi setup.