Short answer: the HIFIMAN RE400, though neither ranks well in its class. It ranks #1015 of 1291 in-ear headphones by sound quality, rated 2.9/5, at $19.99; the ND Planet ranks #1062, rated 2.7/5, and costs $20.99, so there is not much of a tradeoff to weigh. Both are rated below 3.0/5 among the 1291 in-ear headphones, so if sound quality matters, consider the EPZ G10 instead, ranked #16 at $23.74.
What the HIFIMAN RE400 does well: A very low price makes it an easy spare pair or first wired earphone. Watch for: 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.
What the ND Planet does well: Bass is lifted about 3 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. The tradeoff: Presence sits about 3.9 dB low with a 13 dB dip near 11.9 kHz, so vocals and instruments lose some bite.
Buy the HIFIMAN RE400. It is rated higher for sound quality than the ND Planet and costs less, so only choose the other one for a particular feature it does better.
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A very low price makes it an easy spare pair or first wired earphone.
Amazon $19.99 eBay
Bass is lifted about 3 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
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Specifications Side By Side
| HIFIMAN RE400 | ND Planet | |
|---|---|---|
| Price | $19.99 | $20.99 |
| Ranked | #1015 of 1291 in In-Ear Headphones | #1062 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 60 (measured by crinacle, via AutoEQ) | 58 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 3.29 dB standard deviation | 2.85 dB standard deviation |
| Tonal Tilt | +0.63 (negative is warmer, positive brighter) | -1.23 (negative is warmer, positive brighter) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 8.5mm dynamic | 1 x 12mm dynamic |
| Impedance | 32 ohms | 32 ohms |
| Sensitivity | 102 dB/mW | - |
| Built-in Microphone | No | - |
| Back | Closed | Closed |
| Sub-bass Extension | Falls 6 dB below target at 53 Hz (-8.0 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.7 dB at 30 Hz) |
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 HIFIMAN RE400 from aftersound, digaoreviews, fahryst and iemworld; the ND Planet from aftersound, audioamigo, doltonius, ducbloke, eplv, hbb, jaytiss, practiphile, pw, sl0the, soundcheck39, tdl, theaudiostore, tonedeafmonk and treblewellxtended, all via squig.link.
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