Short answer: the KZ ZNA. It ranks #1049 of 1369 in-ear headphones by sound quality, rated 3.1/5, at $22; the HIFIMAN RE400 ranks #1093, rated 2.9/5, at $19.99. Close enough in price that the sound-quality gap is the deciding factor.
The case for the KZ ZNA: About 4 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end. The tradeoff: An uneven response, 2.6 dB standard deviation from target.
Why pick the HIFIMAN RE400: A very low price makes it an easy spare pair or first wired earphone. The tradeoff: Across hobbyist measurements on squig.link sub-bass sits 7.5 dB below target and falls 6 dB short by 53 Hz, while presence drops 5.8 dB and a 9.4 dB dip near 11.9 kHz dulls the top end, so music sounds lean down low and muted up high.
Buy the KZ ZNA. It is rated higher for sound quality, and the $2.01 saving on the HIFIMAN RE400 is not enough to make up the difference.
Looking for alternatives? See the complete Headphones rankings.
About 4 dB more bass than the Harman target below 150 Hz, for listeners who want a fuller low end.
Linsoul $22 eBay
A very low price makes it an easy spare pair or first wired earphone.
Amazon $19.99 eBayPrices on this page were last checked October 17, 2026 at 6:04 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 ZNA | HIFIMAN RE400 | |
|---|---|---|
| Price | $22 | $19.99 |
| Ranked | #1049 of 1369 in In-Ear Headphones | #1093 of 1369 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 63 (median of 8 squig.link measurements, calibrated to AutoEQ) | 60 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.65 dB standard deviation | 3.29 dB standard deviation |
| Tonal Tilt | -0.86 (negative is warmer, positive brighter) | +0.63 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+3.9 dB at 30 Hz) | Falls 6 dB below target at 53 Hz (-8.0 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 DD + 1 BA) | Dynamic |
| Drivers | 1 x 12mm dual-cavity dynamic driver + 1 x 30095 balanced armature driver | 1 x 8.5mm dynamic |
| Impedance | 34 ohms | 32 ohms |
| Sensitivity | 112 dB | 102 dB/mW |
| Frequency Response | 20Hz - 40kHz | - |
| Weight | 0.1 lbs (59 g) (with cable) | - |
| 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 ZNA from ankramutt, gadgetrytech, hore, ianfann, musicafe, practiphile, pw and vortexreviews; the HIFIMAN RE400 from aftersound, digaoreviews, fahryst and iemworld, all via squig.link.
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