Short answer: the Tangzu Nezha. It ranks #884 of 1291 in-ear headphones by sound quality, rated 3.4/5, at $399. The Fearless Audio S6Rui ranks #902, rated 3.3/5, at $389, $10 cheaper, which does not close the gap in sound quality.
Why pick the Tangzu Nezha: A broadly balanced tuning with a preference score of 66 against the Harman target. Watch for: Treble about 3 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Why pick the Fearless Audio S6Rui: Six balanced armature drivers per side earn a preference score of 65 in crinacle’s measurement, a serviceable match to the Harman target. The catch: A 2.7 dB standard deviation from target points to an uneven response that benefits from some EQ.
Buy the Tangzu Nezha. It is rated higher for sound quality, and the $10 you would save on the Fearless Audio S6Rui does not close the gap.
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A broadly balanced tuning with a preference score of 66 against the Harman target.
Linsoul $399.00 eBay
Six balanced armature drivers per side earn a preference score of 65 in crinacle’s measurement, a serviceable match to the Harman target.
Linsoul $389.00 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
| Tangzu Nezha | Fearless Audio S6Rui | |
|---|---|---|
| Price | $399.00 | $389.00 |
| Ranked | #884 of 1291 in In-Ear Headphones | #902 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 66 (median of 5 squig.link measurements, calibrated to AutoEQ) | 65 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.61 dB standard deviation | 2.70 dB standard deviation |
| Tonal Tilt | -0.27 (negative is warmer, positive brighter) | -0.55 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (6 BA + 1 PZT) | Balanced armature |
| Drivers | 6 x balanced armature (2 Sonion subwoofers + 4 custom BA) + 1 x piezoelectric (PZT) driver | 6 x balanced armature |
| Impedance | 16 ohms | 20 ohms |
| Sensitivity | 106 dB | 113 dB |
| Frequency Response | 10Hz - 20kHz | 15Hz - 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 Tangzu Nezha from hu-fi, lown-fi, sl0the, therollo9 and timmyv; the Fearless Audio S6Rui from csi-zone, lown-fi, soundignity and zerostresslevel, all via squig.link.
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