Stax
STAX SR-009S Electrostatic Headphones
Best reference headphones for discerning audiophiles seeking ultimate sonic transparency.
Experience unparalleled audio fidelity with the STAX SR-009S Electrostatic Headphones. These over-ear, open-back headphones feature an advanced MLER 2 multilayer fixed electrode system for reduced air resistance and enhanced sound permeability. The ultra-thin super engineering plastic film diaphragm delivers exceptional transient characteristics across the entire audio spectrum. Crafted with a resonance-reducing aluminum enclosure and a gold-plated electrode for superior clarity and detail, the SR-009S offers a luxurious listening experience. The earpads, made from genuine lamb leather and synthetic leather, ensure comfort for extended sessions, while the silver-coated 6N OFC cable provides pristine signal transmission.
$4545.00
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Owner Satisfaction
4.7
/ 5
Category Rank
74
/ 5533
#74 in Headphones
Price vs Category Average
+673%
Above average
Type
Push-Pull Open Back Circular Electrostatic Headphone
/ Push-Pull Open Back Circular Electrostatic Headphone
Who it's for
- Critical listeners seeking absolute transparency and microscopic detail
- Classical music lovers desiring a realistic, holographic concert hall experience
- Dedicated audiophiles planning marathon listening sessions in total comfort
Who should skip it
- Budget-conscious buyers prioritizing value over ultra-high-end performance
- Minimalists wanting a simple, plug-and-play audio setup
- Casual users who prefer low-maintenance, durable gear
Performance breakdown
Transient Response
Ultra-thin diaphragm delivers lightning-fast speed and unmatched sonic precision.
Soundstage Depth
Open-back design creates an expansive, holographic soundscape for immersive listening.
Build Craftsmanship
Premium aluminum and gold-plated components define high-end audio luxury.
Comfort Ergonomics
Lambskin earpads and adjustable sliders allow for fatigue-free marathon sessions.
Signal Fidelity
Silver-plated 6N copper cabling ensures pristine, uncolored signal transmission.
System Requirements
Requires a dedicated high-voltage electrostatic energizer to function properly.
Key Specs
Type
Push-Pull Open Back Circular Electrostatic Headphone
Frequency Response
5 - 42,000Hz
Electrostatic Capacitance
110pF (including cable)
Impedance
145k Ω (including cable, at 10kHz)
Sound Pressure Sensitivity
101dB / 100V rms 1 kHz
Maximum Sound Pressure
118dB/400Hz
Bias Voltage
580 V DC
Ear Pads
Genuine lambskin leather and high-quality synthetic leather
Features
- Evolved MLER 2 fixed electrode for enhanced sound permeability
- Gold-plated electrodes to minimize resonance and deliver clarity
- Super-thin film diaphragm for exceptional transient characteristics
- Redesigned main body for reduced resonance and consistent sound
- Handmade earpads with genuine lambskin and synthetic leather for comfort
- 10-step adjustable slider mechanism for a secure and comfortable fit
- High-purity 6N silver-plated copper cable for optimal signal transmission
What customers say
Customers consistently laud the STAX SR 009S for its unparalleled sound reproduction, describing an incredibly detailed and transparent listening experience that sets a benchmark in high fidelity audio. The meticulous craftsmanship and premium materials also receive high praise, contributing to a sense of luxurious durability. While a significant investment, owners feel the sonic purity and exquisite build justify its position as a top tier audiophile offering, delivering an immersive and refined soundstage that captivates listeners.
Know before you buy
Yes, these are electrostatic headphones and require a dedicated Stax-compatible electrostatic driver unit (energizer) to operate. They cannot be plugged into standard headphone jacks or traditional amplifiers.
The SR-009S features a 10-step adjustable slider for a precise fit and handmade earpads crafted from genuine lambskin and synthetic leather. While they are substantial, the ergonomic design is intended to remain comfortable for extended periods of use.
The MLER 2 (Multi-Layer ElectRode) system is designed to reduce air resistance and improve sound permeability. This allows the diaphragm to move more freely, resulting in clearer, more detailed audio reproduction.
No, these are open-back headphones, which means they do not isolate you from ambient noise. They are best suited for quiet, controlled listening environments where you can fully appreciate their sonic detail.
The headphones include a 2.5-meter, 6-wire parallel cable made of high-purity 6N oxygen-free copper that is silver-plated. This specialized cable is designed to provide low-capacity, pristine signal transmission from your driver unit.
With a range of 5Hz to 42,000Hz, these headphones capture a wider spectrum than the human ear can perceive. This ensures that the extreme ends of the audio range are reproduced without distortion, providing a highly accurate and transparent soundstage.
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