Over-Ear
STAX SR-009D
88Outstanding
$2640
Full review dataSTAX SR-009D vs Ultrasone Edition 15: which should you buy?
Specs, scores and condensed review verdicts for the STAX SR-009D vs Ultrasone Edition 15, side by side. Where a product has no HearWiki score yet, not enough reviews have been aggregated to rate it.
Over-Ear
Ultrasone Edition 15
Not yet scored
$2999
Full review dataScore breakdown
Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.
STAX SR-009D
Sound9.5
Value5.5
Ultrasone Edition 15
No sub-scores yet - not enough rated reviews.
Specifications
| Spec | STAX SR-009D | Ultrasone Edition 15 |
|---|---|---|
| Type | Over-Ear | Over-Ear |
| Price (USD) | $2640 | $2999 |
| HearWiki score | 88 / 100 · Outstanding | Not scored |
| Released | 2024 | 2018 |
| Audio | ||
| Driver | push-pull electrostatic circular sound element | GTC (Gold-Titanium-Compound) transducer |
| Driver size | - | 40 mm |
| Drivers per side | 2 | 2 |
| Frequency response | 5Hz-42kHz | 5Hz-48kHz |
| Impedance | 145000 Ω | 40 Ω |
| Wireless | ||
| Bluetooth | none | - |
| Multipoint pairing | No | - |
| Battery | ||
| Wireless charging | No | - |
| Features | ||
| Active noise cancelling | No | - |
| ANC type | none | - |
| Transparency mode | No | - |
| Companion app | No | - |
| Custom EQ | No | - |
| Wear detection | No | - |
| Design | ||
| Weight | 594 g | 320 g |
| Detachable cable | - | Yes |
| USB-C | No | No |
What reviewers said
STAX SR-009D
The STAX SR-009D is a premium electrostatic over-ear headphone that pushes the boundaries of high-fidelity audio with an exceptionally wide frequency response and transparent, detailed sound. Its open-back design and push-pull driver technology deliver a refined, airy presentation, but it demands a dedicated amplifier and a significant investment. This is a statement piece for audiophiles seeking the utmost in technical performance, not a casual listening device.
- Pro:Exceptional clarity and detail retrieval
- Pro:Very wide frequency range (5Hz-42kHz)
- Pro:Premium build quality with detachable cable
- Con:Requires specialized electrostatic amplifier
- Con:Very high price point
- Con:Open-back design leaks sound and offers no isolation
Ultrasone Edition 15
The Ultrasone Edition 15 is a premium semi-open headphone that blends warm, musical bass with crisp treble via its gold-titanium compound driver. Its cherry wood cups and aluminum frame give it a refined, luxury look, while the detachable LEMO cables add practical flexibility. Designed for audiophiles seeking a rich, engaging sound with high-end build quality, it sits firmly in the upper echelon of over-ear models.
- Pro:Rich, warm bass response
- Pro:Detailed and precise high frequencies
- Pro:Elegant wood and metal construction
- Con:Very expensive price point
- Con:Semi-open design may leak sound
- Con:Requires quality amplification to shine
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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