KZ Castor in Ear
The dual 10mm dynamic drivers and tuning switches allow for 16 distinct audio profiles, letting users shift from a balanced Harman-target sound to an improved bass response. The injection-molded resin shell achieves a 0.01mm precision fit, paired with a detachable 2PIN-C cable for long-term durability. This IEM is best for budget-conscious listeners who enjoy methodically tweaking their sound signature across different music genres.
No current retailer price
Snapshot
Pros & Cons
Pros
- Strong social proof (90th percentile) 90th
- Strong sound (87th percentile) 87th
- Strong user sentiment (82nd percentile) 82nd
- Strong comfort (70th percentile) 70th
Cons
- Below average connectivity (11th percentile)
- Below average anc (31st percentile)
- Below average build (34th percentile)
What owners think
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews - so you can see whether early praise held up.
- Q1 202680/100
Most buyers praised sound clarity and comfort for gaming/daily use. One defective unit reported no bass, harsh highs, and buyer discomfort.
- Sound quality: crisp, clear, punchy bass, good for gaming—footsteps audible.
- Comfort: lightweight, secure fit for long sessions and sports.
- Build/materials: durable cable, detachable design, sleek look.
- One unit defective—no bass, harsh highs, cause for hearing discomfort. Seller refunded.
- Q4 2025100/100
Buyers praise these entry-level IEMs for great sound, comfort, and build quality, with versatile tuning switches and effective passive noise isolation.
- Excellent sound quality and wide soundstage at a budget price.
- High build quality and comfort praised.
- Versatile tuning switches allow customization without an app.
- Good passive noise isolation and decent bass.
Based on 12 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
Specifications
Full Specifications
Design
| Form Factor | in-ear |
| Ear Tips | S, M |
| Weight | 0.1 kg / 0.2 lbs |
Audio
| Driver Type | dynamic |
| Driver Size | 10 |
| Drivers | 2 |
| Freq Min | 20 |
| Freq Max | 40000 |
| Impedance | 31 |
| Hi-Res Audio | Yes |
| Codecs | KZ Castor in Ear Monitor Headphones with Mic, HiFi Improved Bass Earphone Sound Tunable Noise Isolating IEMs, Dual-Dynamic Driver Wired Earbuds, 2PIN-C Detachable Cable for Singers Musicians |
Connectivity
| Wireless | No |
Microphone
| Microphone | Yes |
vs Competition
| Spec | KZ Castor in Ear | Technics EAH-AZ100 | JLab JBuds Pods ANC | Samsung Galaxy Buds Buds3 Pro | Apple AirPods Pro 3rd Generation | Soundcore P31i |
|---|---|---|---|---|---|---|
| Form Factor | in-ear | in-ear | in-ear | in-ear | in-ear | in-ear |
| Driver Type | dynamic | dynamic | dynamic | dynamic | dynamic | dynamic |
| Wireless | false | true | true | true | true | true |
| Active Noise Cancellation | - | true | true | true | true | true |
| Bluetooth Version | - | 5.3 | 5.4 | 5.4 | 5.3 | 6.1 |
| Battery Life Hours | - | 8 | 10 | 6 | 8 | 10 |
| Case Battery Hours | - | 28 | 56 | 26 | 24 | 50 |
| Water Resistance | - | IPX4 | IP55 | IP57 | IP57 | IP55 |
| Multipoint | - | true | true | true | true | - |
| Compare | Compare | Compare | Compare | Compare |
| Product | Anc | Mic | Build | Sound | Battery | Comfort | User Sentiment | Connectivity | Social Proof | Affordability |
|---|---|---|---|---|---|---|---|---|---|---|
| KZ Castor in Ear | 30.8 | 36.7 | 33.8 | 86.5 | 44.2 | 69.7 | 81.6 | 11.3 | 89.7 | 64.2 |
| Technics EAH-AZ100 Compare | 97.5 | 97.4 | 78.8 | 99.7 | 76.6 | 93.2 | 92.5 | 99.8 | 81.2 | 2.9 |
| JLab JBuds Pods ANC Compare | 93.5 | 97.4 | 90.8 | 87.1 | 94 | 93.2 | 92.5 | 98.1 | 95.5 | 32.9 |
| Samsung Galaxy Buds Buds3 Pro Compare | 97.5 | 97.4 | 98.9 | 92.2 | 70.5 | 93.2 | 33.7 | 99.6 | 89.7 | 7.2 |
| Apple AirPods Pro 3rd Generation Compare | 97.5 | 81 | 98.9 | 90.3 | 73.1 | 69.7 | 33.7 | 99.6 | 99.3 | 11 |
| Soundcore P31i Compare | 89.9 | 97.4 | 90.8 | 96.6 | 92.2 | 69.7 | 97.3 | 86.2 | 89.7 | 57.5 |
Usage Scores
- Calls21
- Music37.9
- Overall34.1
- Budget60.3
- Gaming31.4
- Travel24.2
- Commute23.4
- Fitness24.2
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
