Short answer: the KZ D-Fi. It ranks #289 of 1291 in-ear headphones by sound quality, rated 4.2/5, at $32.99; the KZ Axas ranks #329, rated 4.1/5, at $32.99. With prices this close, go by the sound-quality ranking rather than the cost.
What the KZ D-Fi does well: Remarkably well tuned for the money: the median of 23 measurements has a 1.85 dB spread and a Harman preference score of 76, with bass, lower mids and upper mids all within about 1 dB of target. Watch for: Presence sits about 3 dB low with a 6 dB dip near 5.9 kHz, so voices can sound a touch distant and treble a little dull.
What the KZ Axas does well: The median of 3 hobbyist measurements gives it a very good Harman preference score of 75 with a 1.66 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural. The tradeoff: An 8.2 dB peak near 11.9 kHz can make cymbals and sibilance sound sharp.
Buy the KZ D-Fi. It is rated higher for sound quality than the KZ Axas at the same price, which makes it the one to get unless you need something the other one does better.
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Remarkably well tuned for the money: the median of 23 measurements has a 1.85 dB spread and a Harman preference score of 76, with bass, lower mids and upper mids all within about 1 dB of target.
Amazon $32.99 eBay
The median of 3 hobbyist measurements gives it a very good Harman preference score of 75 with a 1.66 dB spread, and its mids sit within about 0.6 dB of target, so vocals and instruments sound natural.
Amazon $32.99 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
| KZ D-Fi | KZ Axas | |
|---|---|---|
| Price | $32.99 | $32.99 |
| Ranked | #289 of 1291 in In-Ear Headphones | #329 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dual-magnet dynamic | 1 x dynamic |
| Impedance | 23.5 ohms | 20 ohms |
| Frequency Response | 7Hz - 45kHz (Manufacturer specified) | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 76 (median of 23 squig.link measurements, calibrated to AutoEQ) | 75 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.85 dB standard deviation | 1.66 dB standard deviation |
| Tonal Tilt | -0.25 (negative is warmer, positive brighter) | -0.66 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.1 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.3 dB at 30 Hz) |
| Sensitivity | - | 107 dB/mW |
| Built-in Microphone | - | Yes |
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 KZ D-Fi from aden, ankramutt, arn, awsmdanny, bukanaudiophile, cammyfi, csi-zone, dchpgall, fahryst, flare, gadgetrytech, hoods, jaraba, kazi, musicafe, obodio, pw, recode, sl0the, soundignity, superreview, tonedeafmonk and zerostresslevel; the KZ Axas from ankramutt, digaoreviews and tdl, all via squig.link.
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