Short answer: a tie on sound quality. Both are rated 3.8/5 (#546 and #616 of 1291 in-ear headphones) at nearly the same price ($15.99 vs $15.99), so choose on features and fit.
The case for the KZ EDX: The median of 14 hobbyist measurements gives it a solid Harman preference score of 72 with a 1.96 dB spread, and its mids sit within about 1.2 dB of target, so vocals and instruments sound natural. Watch for: An 8.2 dB peak near 11.9 kHz can make cymbals and sibilance sound sharp.
The case for the ND Nice: A broadly balanced tuning with a preference score of 71 against the Harman target. Watch for: An uneven response, 2.4 dB standard deviation from target.
Buy the KZ EDX or the ND Nice on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
The median of 14 hobbyist measurements gives it a solid Harman preference score of 72 with a 1.96 dB spread, and its mids sit within about 1.2 dB of target, so vocals and instruments sound natural.
Amazon $15.99 eBay
A broadly balanced tuning with a preference score of 71 against the Harman target.
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Specifications Side By Side
| KZ EDX | ND Nice | |
|---|---|---|
| Price | $15.99 | $15.99 |
| Ranked | #546 of 1291 in In-Ear Headphones | #616 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 72 (median of 14 squig.link measurements, calibrated to AutoEQ) | 71 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.96 dB standard deviation | 2.38 dB standard deviation |
| Tonal Tilt | -0.41 (negative is warmer, positive brighter) | -0.08 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.6 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 1 x 10mm dynamic |
| Impedance | 23 ohms | - |
| Sensitivity | 112 dB/mW | - |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | - |
| Built-in Microphone | No | - |
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 EDX from achoreviews, aftersound, ankramutt, dchpgall, eplv, jacstone, lown-fi, melatonin, musicafe, pw, scboy, soundignity, therollo9 and vortexreviews; the ND Nice from aftersound, cammyfi, obodio and suporsalad, all via squig.link.
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