Short answer: a tie on sound quality. Both are rated 4.2/5 (#248 and #273 of 1291 in-ear headphones) at nearly the same price ($53.61 vs $55), so choose on features and fit.
Why pick the Kefine Klean: A single 10mm dynamic driver holds an average deviation of about 1.5 dB from target in squig.link hobbyist measurements, for a preference score of 77. The catch: The treble is uneven, with a 3.7 dB peak near 8 kHz followed by a 4.4 dB dip near 9.7 kHz, which can add a little edge to sibilance while blurring cymbal decay.
The case for the Tin HiFi C3 MKII: The median of 11 hobbyist measurements gives it a very good Harman preference score of 76 with a 1.55 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The tradeoff: A 4.9 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp.
Buy the Kefine Klean or the Tin HiFi C3 MKII on features: they are rated the same for sound quality at close to the same price.
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A single 10mm dynamic driver holds an average deviation of about 1.5 dB from target in squig.link hobbyist measurements, for a preference score of 77.
Amazon $53.61 eBay
The median of 11 hobbyist measurements gives it a very good Harman preference score of 76 with a 1.55 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Amazon $55.00 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
| Kefine Klean | Tin HiFi C3 MKII | |
|---|---|---|
| Price | $53.61 | $55.00 |
| Ranked | #248 of 1291 in In-Ear Headphones | #273 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 77 (median of 30 squig.link measurements, calibrated to AutoEQ) | 76 (median of 11 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.52 dB standard deviation | 1.55 dB standard deviation |
| Tonal Tilt | -0.57 (negative is warmer, positive brighter) | -0.56 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 107 dB | 106 dB |
| Weight | 0 lbs (10 g) | 0 lbs (4.1 g) per earbud |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 10Hz - 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 Kefine Klean from aftersound, ankramutt, atechreviews, audioamigo, awsmdanny, bassaudio, boizoff, cqtek, csi-zone, dl, ducbloke, eplv, fahryst, hbb, iemworld, jaytiss, lumerion, musicafe, obodio, practiphile, pw, regancipher, silicagel, sl0the, soundcheck39, soundignity, theaudiostore, timmyv, tonedeafmonk and treblewellxtended; the Tin HiFi C3 MKII from arn, avishai, bassaudio, csi-zone, jaytiss, pw, silicagel, soundcheck39, soundignity, tonedeafmonk and vortexreviews, all via squig.link.
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