Over-Ear
STAX SR-X9000
88Outstanding
$5050
Full review dataSTAX SR-X9000 vs ZMF Caldera Closed: which should you buy?
Specs, scores and condensed review verdicts for the STAX SR-X9000 vs ZMF Caldera Closed, side by side. Where a product has no HearWiki score yet, not enough reviews have been aggregated to rate it.
Over-Ear
ZMF Caldera Closed
Not yet scored
$3499
Full review dataScore breakdown
Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.
STAX SR-X9000
Sound9.5
Value5.0
ZMF Caldera Closed
No sub-scores yet - not enough rated reviews.
Specifications
| Spec | STAX SR-X9000 | ZMF Caldera Closed |
|---|---|---|
| Type | Over-Ear | Over-Ear |
| Price (USD) | $5050 | $3499 |
| HearWiki score | 88 / 100 · Outstanding | Not scored |
| Released | 2021 | 2023 |
| Audio | ||
| Driver | electrostatic | planar |
| Driver size | - | 80 mm |
| Drivers per side | 2 | - |
| Frequency response | 5Hz-42,000Hz | - |
| Impedance | 145000 Ω | 60 Ω |
| Sensitivity | - | 94 dB/mW |
| Wireless | ||
| Multipoint pairing | No | - |
| Features | ||
| Active noise cancelling | No | - |
| Design | ||
| Weight | 432 g | 500 g |
| Balanced connection | - | Yes |
What reviewers said
STAX SR-X9000
The STAX SR-X9000 is a top-tier electrostatic headphone that excels at revealing fine detail, ambient cues, and instrumental nuance, delivering an exceptionally transparent and spacious soundstage. It offers outstanding speed, transient response, and realism, making it ideal for classical and spatially demanding music. However, it requires a dedicated energizer/driver unit, pushing the total system cost far beyond the already steep headphone price.
- Pro:Exceptional detail retrieval and transparency
- Pro:Huge, three-dimensional soundstage with precise imaging
- Pro:Fast transient response and realistic timbre
- Con:Requires separate electrostatic driver unit
- Con:Very high total system cost
- Con:No noise cancellation or wireless convenience
ZMF Caldera Closed
No summary yet - we haven't aggregated enough reviews.
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
Compare something else
Swap either side out, or start again from the picker.