Short answer: the ZiiGaat Arcanis. It ranks #781 of 1291 in-ear headphones by sound quality, rated 3.5/5, at $399. The Fearless Audio S6Rui ranks #902, rated 3.3/5, at $389, $10 cheaper, a saving that is not big enough to make up the sound-quality gap.
What the ZiiGaat Arcanis does well: Mids from 250 Hz to 3 kHz sit within 1 dB of target across 25 measurements, so vocals and acoustic instruments sound natural. The catch: Presence falls about 7 dB low with a 9.8 dB dip near 5.9 kHz, which strips detail and edge from instruments, and sub-bass is 2.1 dB short at 30 Hz.
The case for 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 ZiiGaat Arcanis. It is rated higher for sound quality, and the $10 saving on the Fearless Audio S6Rui is not enough to make up the difference.
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Mids from 250 Hz to 3 kHz sit within 1 dB of target across 25 measurements, so vocals and acoustic instruments sound natural.
Amazon $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
| ZiiGaat Arcanis | Fearless Audio S6Rui | |
|---|---|---|
| Price | $399.00 | $389.00 |
| Ranked | #781 of 1291 in In-Ear Headphones | #902 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Connection | Wired | Wired |
| Driver Type | Hybrid | Balanced armature |
| Drivers | 2 x 10mm dynamic (isobaric) + 5 x balanced armature | 6 x balanced armature |
| Impedance | 12 ohms | 20 ohms |
| Sensitivity | 106 dB/Vrms | 113 dB |
| Frequency Response | 20Hz - 25kHz (Manufacturer specified) | 15Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 68 (median of 25 squig.link measurements, calibrated to AutoEQ) | 65 (measured by crinacle, via AutoEQ) |
| Deviation From Target | 2.46 dB standard deviation | 2.70 dB standard deviation |
| Tonal Tilt | -0.43 (negative is warmer, positive brighter) | -0.55 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.1 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) |
| 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 ZiiGaat Arcanis from aden, aftersound, atechreviews, audioamigo, avishai, bloomaudio, breampike, cqtek, dl, fernandagunsan, gadgetrytech, hbb, iemocean, jaytiss, joycesreview, kr0mka, kuping-sensi, lown-fi, pw, silicagel, soundcheck39, soundignity, superreview, timmyv and vortexreviews; the Fearless Audio S6Rui from csi-zone, lown-fi, soundignity and zerostresslevel, all via squig.link.
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