Short answer: a tie on sound quality. Both are rated 4.3/5 (#192 and #203 of 1291 in-ear headphones) at nearly the same price ($18.04 vs $20), so choose on features and fit.
The case for the Kinera Celest Wyvern Pro: The median of 4 hobbyist measurements gives it a very good Harman preference score of 78 with a 1.72 dB spread, and its mids sit within about 1.3 dB of target, so vocals and instruments sound natural. Watch for: A 4.4 dB peak near 11.9 kHz can make cymbals and sibilance sound sharp.
What the TANCHJIM ZERO DSP does well: A broadly balanced tuning with a preference score of 78 against the Harman target. Watch for: Treble about 2 dB above target from 3 to 10 kHz, which can sound sharp or tiring at higher volume.
Buy the Kinera Celest Wyvern Pro or the TANCHJIM ZERO DSP on features: they are rated the same for sound quality at close to the same price.
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The median of 4 hobbyist measurements gives it a very good Harman preference score of 78 with a 1.72 dB spread, and its mids sit within about 1.3 dB of target, so vocals and instruments sound natural.
Amazon $18.04 eBay
A broadly balanced tuning with a preference score of 78 against the Harman target.
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Specifications Side By Side
| Kinera Celest Wyvern Pro | TANCHJIM ZERO DSP | |
|---|---|---|
| Price | $18.04 | $20 |
| Ranked | #192 of 1291 in In-Ear Headphones | #203 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 78 (median of 4 squig.link measurements, calibrated to AutoEQ) | 78 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.72 dB standard deviation | 1.49 dB standard deviation |
| Tonal Tilt | -0.25 (negative is warmer, positive brighter) | +0.09 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.6 dB at 30 Hz) |
| Connection | Wired | USB-C |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 105 dB | 118 dB/Vrms |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | - |
| Built-in Microphone | Yes | - |
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 Kinera Celest Wyvern Pro from atechreviews, pw, tedthepraimortis and tonedeafmonk; the TANCHJIM ZERO DSP from hobbytalk, tanchjim and therollo9, all via squig.link.
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