Stax SR-009S
The STAX SR-009S is a flagship electrostatic headphone delivering extraordinary transparency, holographic staging and uncompromising precision.
- ✓ Authorized Dealer · Original Warranty
- ✓ 30-Day Returns · Free Shipping
- ✓ Installment Payment Available
Secure Payment
VISA
MC
PayPal
GPay
STAX SR-009S
Flagship Electrostatic Headphone with Ultimate Resolution and Precision
The STAX SR-009S represents the pinnacle of STAX’s modern electrostatic headphone development, combining extraordinary transparency with exceptional control, dynamics and realism. As the successor to the legendary SR-009, the SR-009S was designed to preserve ultimate resolution while introducing a slightly more organic and musical tonal balance.
Its specially engineered MLER-2 (Multi-Layer-Electrodes) structure reduces turbulence and internal resonance within the driver assembly, allowing for even greater signal accuracy and lower distortion. Combined with the ultra-light electrostatic diaphragm, the SR-009S delivers astonishing speed, micro-detail retrieval and effortless transparency.
Sonically, the SR-009S presents music with exceptional openness, holographic imaging and remarkable precision. Vocals sound immediate and lifelike, while instruments are rendered with outstanding separation and spatial accuracy. Compared to the original SR-009, the SR-009S introduces a slightly fuller and more physical presentation without sacrificing its analytical capabilities.
Bass performance is exceptionally fast, controlled and articulate, focusing on texture and realism rather than artificial emphasis. Even highly complex recordings remain clean, layered and effortlessly transparent.
Its premium aluminum construction, precise craftsmanship and genuine leather earpads further reinforce the uncompromising flagship character of the SR-009S. For many listeners, it remains one of the most technically capable headphones ever created.
Like all STAX electrostatic headphones, the SR-009S requires a dedicated electrostatic amplifier or energizer with a PRO bias connection.
Technical Specifications
| Type | Electrostatic push-pull open-air headphone |
| Design | Open-back, over-ear |
| Frequency Response | 5 Hz – 42,000 Hz |
| Capacitance | 110 pF |
| Sensitivity | 101 dB / 100 V RMS / 1 kHz |
| Bias Voltage | 580 V DC (PRO Bias) |
| Earpads | Genuine leather |
| Cable | High-purity silver-plated OFC cable, 2.5 m |
| Weight | 432 g |
Measurements
Frequency response
What does this mean?
The line marked as target is something you could call the “ideal” curve: a target response derived from research by the Harman group, exploring what kind of headphone tuning tends to be preferred by a broad range of listeners – regardless of age or demographics. This is often referred to as the Harman Target.
From left to right you see sub-bass, bass, mids, and then the curve tilts upward where treble begins. That part of the spectrum is naturally amplified by the shape of the human ear.
Sub-bass sits far below the target – common for open headphones, the Harman target includes a strong bass shelf, the bass is slightly reduced. The lower mids are neutral, the presence region around 3 kHz sits slightly below the target. The treble is slightly tuned more relaxed – never sharp, easy over long sessions, and the range above 10 kHz stays on the curve. Left and right channels track each other closely, a sign of careful driver matching.
Harman Research: The Perception and Measurement of Headphone Sound Quality – What Do Listeners Prefer?
Data sheet
- Design
- Open
- Driver
- Electrostatic
- Amplification needs
- Electrostatic amplifier required
- Headphone connector
- Stax Pro-Bias (5-Pin)
- Weight
- 432 g
You might also like
-
![]()
-€500.00 Off
- -€500.00
-
![]()
-
![]()
-
![]()
