Short answer: the HIFIMAN RE400, though neither ranks well in its class. It ranks #57 of 68 in-ear headphones by sound quality, rated 2.9/5, at $19.99; the KZ EDX Pro ranks #61, rated 2.7/5, at $17.99. The price gap is small enough that the sound-quality ranking should decide it. Both are rated below 3.0/5 among the 68 in-ear headphones, so if sound quality matters, consider the Truthear Gate instead, ranked #5 at $21.99.
Why pick the HIFIMAN RE400: A very low price makes it an easy backup pair or first wired earphone. The catch: A preference score of 60 with a 3.29 dB deviation from the target means the response is quite uneven, so some instruments and vocals will sound colored.
What the KZ EDX Pro does well: Priced among the lowest in the class, which makes it a throwaway-friendly spare pair. The catch: A preference score of 58 and a 2.91 dB deviation from the target indicate an uneven balance that colors vocals and instruments.
Buy the HIFIMAN RE400. It is rated higher for sound quality, and the $2 saving on the KZ EDX Pro is not enough to make up the difference.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| HIFIMAN RE400 | KZ EDX Pro | |
|---|---|---|
| Price | $19.99 | $17.99 |
| Ranked | #57 of 68 in In-Ear Headphones | #61 of 68 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 60 (measured by crinacle, via AutoEQ) | 58 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 3.29 dB standard deviation | 2.91 dB standard deviation |
| Tonal Tilt | +0.63 (negative is warmer, positive brighter) | -1.10 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 8.5mm dynamic | 1 x 10mm dynamic |
| Impedance | 32 ohms | 24 ohms |
| Sensitivity | 102 dB/mW | 112 dB |
| Built-in Microphone | No | - |
| Back | Closed | Closed |
| Frequency Response | - | 10Hz - 20kHz (Manufacturer specified) |
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More worthwhile head-to-heads for HIFIMAN RE400:
- KZ DQ6S vs KZ EDX Pro
- KZ EDX Pro vs Panasonic RP-HJE120
- KZ AS10 vs Final Audio E3000
- Sennheiser CX 3.00 vs 1MORE Triple Driver
- Shure SE215 vs Jabra Elite Active 65t
Prices on this page were last checked October 10, 2026 at 5:37 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
HIFIMAN RE400: $19.99 Amazon eBay
Pros: A very low price makes it an easy backup pair or first wired earphone. The single 8.5mm dynamic driver, 32 ohm impedance and 102 dB/mW sensitivity work fine straight from a phone or laptop. Crinacle’s measurement shows a slightly bright tilt of about 0.6 dB, which gives a lean, light presentation for those who dislike bass-heavy sound.
Cons: A preference score of 60 with a 3.29 dB deviation from the target means the response is quite uneven, so some instruments and vocals will sound colored. There is no built-in microphone, so it cannot take calls. The KZ ATE and SoundMAGIC E50C are rated higher at a similar price.
Full HIFIMAN RE400 review and specifications →
| Back | Closed |
|---|---|
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 3.29 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 8.5mm dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 60 (measured by crinacle, via AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 102 dB/mW |
| Tonal Tilt | +0.63 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -6.0 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +6.0 dB | 0.70 |
| Peak | 3,850 Hz | +7.0 dB | 2.19 |
| Peak | 170 Hz | -2.3 dB | 0.43 |
| Peak | 2,033 Hz | -3.6 dB | 1.58 |
| Peak | 801 Hz | +1.9 dB | 1.59 |
| High shelf | 10,000 Hz | +1.7 dB | 0.70 |
| Peak | 6,033 Hz | -4.6 dB | 6.00 |
| Peak | 4,799 Hz | +2.1 dB | 4.73 |
| Peak | 3,186 Hz | +0.9 dB | 6.00 |
| Peak | 3,794 Hz | -1.0 dB | 6.00 |
- Reviews, Comparisons and Sound Samples
KZ EDX Pro: $17.99 Amazon eBay
Pros: Priced among the lowest in the class, which makes it a throwaway-friendly spare pair. The 10mm dynamic driver, 24 ohm impedance and 112 dB sensitivity are easy for any phone to drive to loud levels. Crinacle measured a warm tilt of about 1.1 dB, a good match for those who prefer a gentle, bass-leaning sound.
Cons: A preference score of 58 and a 2.91 dB deviation from the target indicate an uneven balance that colors vocals and instruments. No microphone is listed, so calls are not an option. The KZ DQ6S, KZ ATE and CCA CSN are all rated higher at a similar cost.
Full KZ EDX Pro review and specifications →
| Released | Sep 2021 (5 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.91 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 58 (measured by crinacle, via AutoEQ) |
| Impedance | 24 ohms |
| Sensitivity | 112 dB |
| Tonal Tilt | -1.10 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -5.1 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -2.3 dB | 0.70 |
| Peak | 169 Hz | -4.0 dB | 0.82 |
| Peak | 9,836 Hz | +2.9 dB | 0.18 |
| Peak | 783 Hz | +3.2 dB | 1.23 |
| Peak | 2,062 Hz | -4.8 dB | 2.53 |
| High shelf | 10,000 Hz | -6.1 dB | 0.70 |
| Peak | 9,508 Hz | +3.3 dB | 2.86 |
| Peak | 4,965 Hz | -5.7 dB | 5.27 |
| Peak | 3,516 Hz | +2.7 dB | 3.58 |
| Peak | 6,291 Hz | +3.2 dB | 5.44 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons