Short answer: the EUIU EI-01. It ranks #599 of 1291 in-ear headphones by sound quality, rated 3.8/5, at $29; the Kinera Celest Wyvern ranks #680, rated 3.7/5, and costs $29.99, so there is little reason to consider the other one.
Why pick the EUIU EI-01: A cheap single dynamic IEM with a titanium composite diaphragm. The tradeoff: Treble sits about 3.1 dB below target, a dark, relaxed balance.
The case for the Kinera Celest Wyvern: A broadly balanced tuning with a preference score of 70 against the Harman target. The catch: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Buy the EUIU EI-01. It is rated higher for sound quality than the Kinera Celest Wyvern and costs less, which makes it the one to get unless you need something the other one does better.
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A cheap single dynamic IEM with a titanium composite diaphragm.
Linsoul $29.00 eBay
A broadly balanced tuning with a preference score of 70 against the Harman target.
Linsoul $29.99 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| EUIU EI-01 | Kinera Celest Wyvern | |
|---|---|---|
| Price | $29.00 | $29.99 |
| Ranked | #599 of 1291 in In-Ear Headphones | #680 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired (3.5mm) |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 Dynamic (10mm LCP) |
| Impedance | 32 ohms | - |
| Sensitivity | 109 dB/mW | - |
| Harman Preference Score | 71 (median of 6 squig.link measurements, calibrated to AutoEQ) | 70 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.08 dB standard deviation | 2.22 dB standard deviation |
| Tonal Tilt | -0.74 (negative is warmer, positive brighter) | -0.66 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.5 dB at 30 Hz) |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the EUIU EI-01 from bassaudio, fernandagunsan, kuping-sensi, soundcheck39, soundignity and tdl; the Kinera Celest Wyvern from cammyfi, csi-zone, eplv, harpo, koi, soundignity and vortexreviews, all via squig.link.
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