Short answer: the Kefine Klean. It ranks #84 of 450 in-ear headphones by sound quality, rated 4.5/5, at $53.61; the KZ ZEX Pro ranks #125, rated 4.4/5, and costs $55.99, which makes this an easy call rather than a real tradeoff.
What the Kefine Klean does well: Four squig.link measurements give the Klean a preference score of 79.4 with a very smooth 1.32 dB deviation from target. Watch for: A 5 dB dip near 9.9 kHz dulls the shimmer of cymbals and strings, and presence sits 1.9 dB below target, softening vocal edges.
Buy the Kefine Klean. It is rated higher for sound quality than the KZ ZEX Pro and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Headphones rankings.
Specifications Side By Side
| Kefine Klean | KZ ZEX Pro | |
|---|---|---|
| Price | $53.61 | $55.99 |
| Ranked | #84 of 450 in In-Ear Headphones | #125 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 79 (median of 4 squig.link measurements, calibrated to AutoEQ) | 78 (median of 19 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.32 dB standard deviation | 1.58 dB standard deviation |
| Tonal Tilt | -0.39 (negative is warmer, positive brighter) | -0.26 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid (1 dynamic + 1 balanced armature + 1 electrostatic) |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic + 1 x balanced armature + 1 x electrostatic |
| Impedance | 32 ohms | 25 ohms |
| Sensitivity | 107 dB | 104 dB |
| Weight | 0 lbs (10 g) | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
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Prices on this page were last checked October 11, 2026 at 4:59 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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The Two Headphones In Full
Kefine Klean: $53.61 Amazon eBay
Pros: Four squig.link measurements give the Klean a preference score of 79.4 with a very smooth 1.32 dB deviation from target. Sub-bass 1.3 dB and bass 2.1 dB above target give it a warm, rich low end that suits bassy tastes, while mids stay close to neutral. At 32 ohms and 107 dB it plays well from a phone, and it weighs 10 g.
Cons: A 5 dB dip near 9.9 kHz dulls the shimmer of cymbals and strings, and presence sits 1.9 dB below target, softening vocal edges. It costs more than the equally rated KZ Duonic and Sivga SM100.
Full Kefine Klean review and specifications →
| Released | Oct 2024 (2 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.32 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 79 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 107 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.0 dB at 30 Hz) |
| Tonal Tilt | -0.39 (negative is warmer, positive brighter) |
| Weight | 0 lbs (10 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
KZ ZEX Pro: $55.99 Amazon eBay
Full KZ ZEX Pro review and specifications →
| Released | 2021 (5 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.58 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature + 1 electrostatic) |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature + 1 x electrostatic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 78 (median of 19 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 25 ohms |
| Sensitivity | 104 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) |
| Tonal Tilt | -0.26 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons