Short answer: a tie on sound quality. Both are rated 3.8/5 (#599 and #577 of 1291 in-ear headphones) at nearly the same price ($29 vs $29.99), so choose on features and fit.
What the EUIU EI-01 does well: A cheap single dynamic IEM with a titanium composite diaphragm. Watch for: Treble sits about 3.1 dB below target, a dark, relaxed balance.
Why pick the Kinera Celest Wyvern Abyss: The median of 15 hobbyist measurements gives it a solid Harman preference score of 71 with a 2.07 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural. The catch: Its 2.07 dB spread is less even than the best measured sets.
Buy the EUIU EI-01 or the Kinera Celest Wyvern Abyss on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
A cheap single dynamic IEM with a titanium composite diaphragm.
Linsoul $29.00 eBay
The median of 15 hobbyist measurements gives it a solid Harman preference score of 71 with a 2.07 dB spread, and its mids sit within about 0.8 dB of target, so vocals and instruments sound natural.
Amazon $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 Abyss | |
|---|---|---|
| Price | $29.00 | $29.99 |
| Ranked | #599 of 1291 in In-Ear Headphones | #577 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 109 dB/mW | - |
| Harman Preference Score | 71 (median of 6 squig.link measurements, calibrated to AutoEQ) | 71 (median of 15 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.08 dB standard deviation | 2.07 dB standard deviation |
| Tonal Tilt | -0.74 (negative is warmer, positive brighter) | -0.69 (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 (+0.6 dB at 30 Hz) |
| Frequency Response | - | 20Hz - 20kHz (Manufacturer specified) |
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 Abyss from aftersound, audioamigo, awsmdanny, banzai1122, boizoff, csi-zone, dl, eplv, fahryst, hobbytalk, jaytiss, kr0mka, kuping-sensi, mmagtech, obodio, pw, silicagel, soundcheck39, soundignity, superreview, tdl, treblewellxtended and vortexreviews, all via squig.link.
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