Short answer: the Kefine Delci. It ranks #570 of 1291 in-ear headphones by sound quality, rated 3.8/5, at $58.50; the KZ ZS10 Pro 2 ranks #634, rated 3.7/5, at $54.99. The price gap is small enough that the sound-quality ranking should decide it.
The case for the Kefine Delci: A warm, bass forward tuning measured by 31 people: sub-bass and bass sit about 2 to 3 dB above target with extension right down to 20 Hz, giving electronic and hip hop tracks satisfying weight. The catch: The 3 to 6 kHz presence region dips about 2.5 dB with a 3.3 dB low point near 3.5 kHz, so vocals sit slightly behind the bass.
The case for the KZ ZS10 Pro 2: The median of 9 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.13 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. The catch: An 8 dB peak near 10.9 kHz can make cymbals and sibilance sound sharp.
Buy the Kefine Delci. It is rated higher for sound quality, and the $3.51 you would save on the KZ ZS10 Pro 2 does not close the gap.
Looking for alternatives? See the complete Headphones rankings.
A warm, bass forward tuning measured by 31 people: sub-bass and bass sit about 2 to 3 dB above target with extension right down to 20 Hz, giving electronic and hip hop tracks satisfying weight.
Amazon $58.50 eBay
The median of 9 hobbyist measurements gives it a solid Harman preference score of 70 with a 2.13 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
Amazon $54.99 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
| Kefine Delci | KZ ZS10 Pro 2 | |
|---|---|---|
| Price | $58.50 | $54.99 |
| Ranked | #570 of 1291 in In-Ear Headphones | #634 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 4 balanced armature) |
| Drivers | 1 x 10mm DLC+PU dynamic | 1 x 10mm dynamic + 4 x balanced armature |
| Impedance | 28 ohms | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Weight | 0 lbs (5.3 g) | - |
| Harman Preference Score | 71 (median of 31 squig.link measurements, calibrated to AutoEQ) | 70 (median of 9 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.93 dB standard deviation | 2.13 dB standard deviation |
| Tonal Tilt | -0.74 (negative is warmer, positive brighter) | +0.80 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
| Sensitivity | - | 108 dB |
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 Delci from achoreviews, aden, aftersound, atechreviews, audioamigo, cqtek, csi-zone, dl, fahryst, gadgetrytech, harpo, hbb, iemworld, jaytiss, lown-fi, mmagtech, musicafe, obodio, pw, regancipher, riz, silicagel, sl0the, soundcheck39, soundignity, superreview, theaudiostore, timmyv, tonedeafmonk, treblewellxtended and vortexreviews; the KZ ZS10 Pro 2 from arn, ekaudio, gadgetrytech, musicafe, obodio, pw, silicagel, tonedeafmonk and vortexreviews, all via squig.link.
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