Short answer: the TINHIFI C0. It ranks #362 of 1291 in-ear headphones by sound quality, rated 4.1/5, at $23.90; the KZ ZSN Pro X ranks #388, rated 4.0/5, and costs $23.99, so there is little reason to consider the other one.
Why pick the TINHIFI C0: A broadly balanced tuning with a preference score of 75 against the Harman target. Watch for: About 3 dB less bass than the Harman target below 150 Hz, which can sound thin on pop, hip hop and electronic music.
Why pick the KZ ZSN Pro X: The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop. Watch for: A 7.2 dB peak near 8.1 kHz and an air band about 5.8 dB above target can make cymbals and s sounds sharp or hissy at higher volume.
Buy the TINHIFI C0. It is rated higher for sound quality than the KZ ZSN Pro X and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 75 against the Harman target.
Amazon $23.90 eBay
The hybrid design with a 10mm dynamic driver and a balanced armature gives bass about 3.6 dB above target at 60 to 200 Hz, which adds punch and warmth for pop and hip hop.
Amazon $23.99 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
| TINHIFI C0 | KZ ZSN Pro X | |
|---|---|---|
| Price | $23.90 | $23.99 |
| Ranked | #362 of 1291 in In-Ear Headphones | #388 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 75 (median of 8 squig.link measurements, calibrated to AutoEQ) | 74 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 1.95 dB standard deviation | 2.09 dB standard deviation |
| Tonal Tilt | +0.42 (negative is warmer, positive brighter) | -0.17 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature) |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic + 1 x balanced armature |
| Impedance | 32 ohms | 25 ohms |
| Sensitivity | 105 dB | 112 dB/mW |
| Frequency Response | - | 7Hz - 40kHz (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 TINHIFI C0 from achoreviews, ankramutt, dvewlsh, practiphile, soundcheck39, superreview, tonedeafmonk and yoshiultra; the KZ ZSN Pro X from achoreviews, aftersound, audioamigo, bryaudioreviews, dchpgall, eplv, gadgetrytech, melatonin, nymz, pw, ragnarok, riz, tdl and therollo9, all via squig.link.
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