Stax
STAX SR-009D Electrostatic Headphones
Best open-back headphones for audiophiles seeking unparalleled clarity and long-term comfort.
The STAX SR-009D Electrostatic Headphones represent a significant return for a beloved high-end model, now more accessible than ever. Building on the legacy of the SR-009, these open-back, over-ear headphones feature the groundbreaking MLER (Multi-Layer Electrode) technology, utilizing thermal diffusion bonding for exceptional planarity and sound transmission. The SR-009D boasts a newly developed, lightweight injection-molded unit case and a detachable, replaceable cable design for enhanced usability and maintenance. With genuine sheep leather ear pads and a 10-step adjustable headband, they offer superior comfort for extended listening sessions.
$2890.00
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Owner Satisfaction
4.7
/ 5
Category Rank
74
/ 5531
#74 in Headphones
Price vs Category Average
+392%
Above average
Type
push-pull electrostatic sound element
/ push-pull electrostatic sound element
Who it's for
- Audiophiles seeking absolute sonic transparency and expansive soundstages
- Critical listeners demanding precise micro-dynamic detail retrieval
- Long-session listeners prioritizing lightweight, ergonomic comfort
Who should skip it
- Commuters or travelers needing portable, versatile listening gear
- Budget-conscious buyers seeking value-oriented audio equipment
- Minimalists wanting a simple, plug-and-play audio setup
Performance breakdown
Sonic Transparency
MLER technology delivers unmatched clarity and microscopic detail retrieval.
Frequency Extension
The expansive 5-42,000Hz range captures every nuance of the recording.
Ergonomic Comfort
Sheep leather and adjustable headband ensure fatigue-free long-form listening.
Build Integrity
Injection-molded casing balances structural rigidity with necessary lightweight portability.
Maintenance Accessibility
Detachable cable design significantly improves long-term ownership and repairability.
System Synergy
Requires dedicated high-voltage amplification to reach its full potential.
Key Specs
Type
push-pull electrostatic sound element
Frequency response
5 - 42,000Hz
Electrostatic capacitance
110pF
Impedance
145k Ohms
Sound pressure sensitivity
101dB
Bias voltage
580V DC
Cable length
2.5m
Weight
452g
Features
- Groundbreaking MLER (Multi-Layer Electrode) technology
- Lightweight injection-molded unit case
- Detachable and replaceable cable
- Genuine sheep leather ear pads
- 10-step adjustable headband
- Open-air electrostatic design
What customers say
Customers consistently laud the STAX SR 009D for its unparalleled sound quality, describing an incredibly detailed, transparent, and expansive audio experience. The precision and clarity are frequently highlighted as benchmarks in high fidelity listening. Beyond the sonic excellence, the headphones receive high marks for their exquisite design and premium build quality, reflecting meticulous craftsmanship. Users appreciate the luxurious feel and robust construction, which contribute to a sense of enduring value and a truly high end product experience. The overall consensus points to a reference class device.
Know before you buy
Because these are electrostatic headphones, they require a dedicated electrostatic driver unit (energizer) that provides a 580V DC bias voltage. They cannot be driven by standard headphone jacks or traditional amplifiers.
The Multi-Layer Electrode (MLER) technology uses thermal diffusion bonding to ensure the electrodes are perfectly flat and rigid. This minimizes resonance and allows for extremely precise, transparent sound transmission across the entire frequency range.
Yes, the SR-009D features a detachable cable design. This makes it much easier to replace the cable if it becomes damaged or if you prefer to use a different length or type of compatible cable.
They are designed for comfort, featuring genuine sheep leather ear pads and a 10-step adjustable headband. While they weigh 452g, the weight is well-distributed to minimize fatigue during extended use.
The open-back design allows sound to pass freely through the ear cups, which creates a more natural, spacious soundstage. However, it also means that sound will leak out, and you will be able to hear ambient noise from your surroundings.
The SR-009D retains the core electrostatic performance of the original while introducing a more durable, lightweight injection-molded unit case and the convenience of a detachable cable system for better long-term maintenance.
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Ready to buy?
$2890