Wired IEMs
KZ Castor
72Good
$15
Full review dataKZ Castor vs Moondrop JIU: which should you buy?
On aggregated review scores the Moondrop JIU comes out ahead with an HearWiki score of 74. The full breakdown - sub-scores, specs and what reviewers actually said - is below.
Our pick: Moondrop JIU - Good overall at around $19.
Wired IEMs
Moondrop JIU
74Good
$19
Full review dataScore breakdown
Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.
KZ Castor
Sound7.0
Value8.0
Moondrop JIU
Sound7.5
Value8.0
Specifications
| Spec | KZ Castor | Moondrop JIU |
|---|---|---|
| Type | Wired IEMs | Wired IEMs |
| Price (USD) | $15 | $19 |
| HearWiki score | 72 / 100 · Good | 74 / 100 · Good |
| Released | 2023 | 2023 |
| Audio | ||
| Driver | Dual dynamic drivers (8mm + 10mm dual magnetic) | 10mm High-performance Dynamic Driver |
| Driver size | 10 mm | 10 mm |
| Drivers per side | 2 | 1 |
| Frequency response | 20Hz-40kHz | 10Hz-35kHz |
| Impedance | 31 Ω | 32 Ω |
| Sensitivity | 105 dB/mW | 110 dB/mW |
| Wireless | ||
| Bluetooth | none | - |
| Multipoint pairing | No | No |
| Battery | ||
| Wireless charging | No | - |
| Features | ||
| Active noise cancelling | No | No |
| ANC type | none | - |
| Transparency mode | No | - |
| Companion app | No | - |
| Custom EQ | Yes | - |
| Wear detection | No | - |
| Controls | none | - |
| Design | ||
| Detachable cable | Yes | No |
| USB-C | No | Yes |
| Calls | ||
| Microphones | - | 1 |
| Call noise reduction | - | DSP microphone |
What reviewers said
KZ Castor
The KZ Castor is a budget-friendly in-ear monitor with dual dynamic drivers and adjustable tuning switches, offering a fun, energetic sound that punches above its price. It's particularly well-suited for bass lovers and gamers, though its technical performance and accessory package are only average for the price.
- Pro:Adjustable tuning switches for sound customization
- Pro:Strong bass response and energetic sound signature
- Pro:Good build quality and comfortable fit for the price
- Con:Average technical performance and detail retrieval
- Con:Stock cable and accessories feel cheap
- Con:Slight treble sibilance and artificial vocals at times
Moondrop JIU
The Moondrop JIU is an affordable wired USB-C earphone that delivers surprisingly polished sound for its price, with a well-tuned dynamic driver and a DSP microphone for calls. It's a sensible pick for casual listeners who value simplicity, though its non-detachable cable and occasionally bright treble may deter some. Overall, it offers solid value within the still-narrow field of DSP-equipped budget IEMs.
- Pro:Excellent tuning for the price
- Pro:Good technical performance for a budget model
- Pro:USB-C connectivity with DSP mic for clear calls
- Con:Treble can be overly bright for some
- Con:Fixed cable cannot be replaced
- Con:Not an elite technical performer
Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.
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