Short answer: the Kiwi Ears Forteza. It ranks #575 of 1291 in-ear headphones by sound quality, rated 3.8/5, at $59; 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.
What the Kiwi Ears Forteza does well: The median of 16 hobbyist measurements gives it a solid Harman preference score of 71 with a 1.97 dB spread. Watch for: A 10.7 dB peak near 8.2 kHz can make cymbals and sibilance sound sharp.
What the KZ ZS10 Pro 2 does well: 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 Kiwi Ears Forteza. It is rated higher for sound quality, and saving $4.01 with the KZ ZS10 Pro 2 does not make up for the sound-quality gap.
Still deciding? The full Headphones rankings cover every ranked option.
The median of 16 hobbyist measurements gives it a solid Harman preference score of 71 with a 1.97 dB spread.
Amazon $59.00 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.
As an eBay Partner, we may be compensated if you make a purchase.
Specifications Side By Side
| Kiwi Ears Forteza | KZ ZS10 Pro 2 | |
|---|---|---|
| Price | $59.00 | $54.99 |
| Ranked | #575 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 | Hybrid | Hybrid (1 dynamic + 4 balanced armature) |
| Drivers | 2 x 10mm dynamic + 1 x balanced armature | 1 x 10mm dynamic + 4 x balanced armature |
| Impedance | 32 ohms | - |
| Sensitivity | 103 dB/mW | 108 dB |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 71 (median of 16 squig.link measurements, calibrated to AutoEQ) | 70 (median of 9 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.97 dB standard deviation | 2.13 dB standard deviation |
| Tonal Tilt | -0.17 (negative is warmer, positive brighter) | +0.80 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+3.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
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 Kiwi Ears Forteza from achoreviews, aden, aftersound, audioamigo, bloomaudio, hbb, ianfann, jaytiss, joshtbvo, kr0mka, kuping-sensi, musicafe, pw, rg, soundcheck39 and vortexreviews; the KZ ZS10 Pro 2 from arn, ekaudio, gadgetrytech, musicafe, obodio, pw, silicagel, tonedeafmonk and vortexreviews, all via squig.link.
Related Headphone Comparisons
More top alternatives to Kiwi Ears Forteza: