Short answer: the TANCHJIM ZERO DSP. It ranks #203 of 1291 in-ear headphones by sound quality, rated 4.3/5, at $20; the Tin HiFi C0 ranks #254, rated 4.2/5, at $19.99. Close enough in price that the sound-quality gap is the deciding factor.
What the TANCHJIM ZERO DSP does well: A broadly balanced tuning with a preference score of 78 against the Harman target. The catch: Treble about 2 dB above target from 3 to 10 kHz, which can sound sharp or tiring at higher volume.
What the Tin HiFi C0 does well: The median of 14 hobbyist measurements gives it a very good Harman preference score of 77 with a 1.81 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The tradeoff: Sub-bass is 4 dB short at 30 Hz, so deep bass lacks rumble.
Buy the TANCHJIM ZERO DSP. It is rated higher for sound quality, and saving $0.01 with the Tin HiFi C0 does not make up for the sound-quality gap.
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A broadly balanced tuning with a preference score of 78 against the Harman target.
e-earphone (JP) eBay
The median of 14 hobbyist measurements gives it a very good Harman preference score of 77 with a 1.81 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
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Specifications Side By Side
| TANCHJIM ZERO DSP | Tin HiFi C0 | |
|---|---|---|
| Price | $20 | $19.99 |
| Ranked | #203 of 1291 in In-Ear Headphones | #254 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 78 (median of 3 squig.link measurements, calibrated to AutoEQ) | 77 (median of 14 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.49 dB standard deviation | 1.81 dB standard deviation |
| Tonal Tilt | +0.09 (negative is warmer, positive brighter) | +0.24 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-4.0 dB at 30 Hz) |
| Connection | USB-C | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x dynamic |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 118 dB/Vrms | 105 dB |
| Weight | - | 0 lbs (3.8 g) per earbud |
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 TANCHJIM ZERO DSP from hobbytalk, tanchjim and therollo9; the Tin HiFi C0 from aftersound, bedrock, boizoff, cqtek, csi-zone, digaoreviews, fernandagunsan, gadgetrytech, ianfann, kuping-sensi, mmagtech, obodio, soundignity and vortexreviews, all via squig.link.
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