Short answer: the Kefine Klean SV. It ranks #73 of 1291 in-ear headphones by sound quality, rated 4.6/5, at $59.99; the Tin HiFi T4 Plus ranks #116, rated 4.5/5, and costs $69, so there is not much of a tradeoff to weigh.
The case for the Kefine Klean SV: The median of 18 squig.link measurements gives a preference score of 80.9 and a very smooth 1.28 dB deviation. Watch for: A 5.4 dB dip near 9.5 kHz and treble about 2.5 dB under target from 6 to 10 kHz mute cymbal texture, while the air band above 10 kHz rises about 5 dB, so the top end can sound uneven.
Why pick the Tin HiFi T4 Plus: Across ten squig.link measurements it scores 80.0 for preference, with sub-bass sitting right on target down to 30 Hz and a 2.2 dB bass lift that gives drums and electric bass a satisfying thump. Watch for: Treble climbs to a 4.8 dB peak near 11.9 kHz, which some listeners hear as hiss or shimmer that sits above the music.
Buy the Kefine Klean SV. It is rated higher for sound quality than the Tin HiFi T4 Plus and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
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The median of 18 squig.link measurements gives a preference score of 80.9 and a very smooth 1.28 dB deviation.
Amazon $59.99 eBay
Across ten squig.link measurements it scores 80.0 for preference, with sub-bass sitting right on target down to 30 Hz and a 2.2 dB bass lift that gives drums and electric bass a satisfying thump.
Amazon $69.00 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 SV | Tin HiFi T4 Plus | |
|---|---|---|
| Price | $59.99 | $69.00 |
| Ranked | #73 of 1291 in In-Ear Headphones | #116 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 81 (median of 18 squig.link measurements, calibrated to AutoEQ) | 79 (median of 15 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.28 dB standard deviation | 1.42 dB standard deviation |
| Tonal Tilt | -0.40 (negative is warmer, positive brighter) | -0.32 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.3 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) per earbud | 0 lbs (4 g) per earbud |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 10Hz - 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 Kefine Klean SV from ankramutt, atechreviews, audioamigo, bassaudio, csi-zone, dl, eplv, fahryst, fernandagunsan, hbb, jaytiss, musicafe, practiphile, precog, soundcheck39, soundignity, superreview and tonedeafmonk; the Tin HiFi T4 Plus from achoreviews, arn, bedrock, cqtek, hbb, hobbytalk, hu-fi, ianfann, jaytiss, kazi, nymz, pw, soundcheck39, superreview and timmyv, all via squig.link.
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