Short answer: a tie on sound quality. Both are rated 3.8/5 (#570 and #575 of 1291 in-ear headphones) at nearly the same price ($58.50 vs $59), so choose on features and fit.
Why pick 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 tradeoff: 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 Kiwi Ears Forteza: The median of 16 hobbyist measurements gives it a solid Harman preference score of 71 with a 1.97 dB spread. The tradeoff: A 10.7 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp.
Buy the Kefine Delci or the Kiwi Ears Forteza on features: they are rated the same for sound quality at close to the same price.
Still deciding? The full Headphones rankings cover every ranked option.
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 16 hobbyist measurements gives it a solid Harman preference score of 71 with a 1.97 dB spread.
Amazon $59.00 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 Delci | Kiwi Ears Forteza | |
|---|---|---|
| Price | $58.50 | $59.00 |
| Ranked | #570 of 1291 in In-Ear Headphones | #575 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid |
| Drivers | 1 x 10mm DLC+PU dynamic | 2 x 10mm dynamic + 1 x balanced armature |
| Impedance | 28 ohms | 32 ohms |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Weight | 0 lbs (5.3 g) | - |
| Harman Preference Score | 71 (median of 31 squig.link measurements, calibrated to AutoEQ) | 71 (median of 16 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.93 dB standard deviation | 1.97 dB standard deviation |
| Tonal Tilt | -0.74 (negative is warmer, positive brighter) | -0.17 (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 (+3.7 dB at 30 Hz) |
| Sensitivity | - | 103 dB/mW |
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 Kiwi Ears Forteza from achoreviews, aden, aftersound, audioamigo, bloomaudio, hbb, ianfann, jaytiss, joshtbvo, kr0mka, kuping-sensi, musicafe, pw, rg, soundcheck39 and vortexreviews, all via squig.link.
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