The Fearless Audio S6Rui ranks #185 out of 263 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: Fearless
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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#185 Fearless Audio S6Rui: $389.00 Linsoul eBay
Pros: Six balanced armature drivers per side earn a preference score of 65 in crinacle’s measurement, a serviceable match to the Harman target. A 20 ohm impedance and 113 dB sensitivity let it reach loud levels straight from a phone or dongle. It earns the same rating as the OpenAudio Mercury for noticeably less money.
Cons: A 2.7 dB standard deviation from target points to an uneven response that benefits from some EQ. The Fearless Audio S8F from the same maker rates higher for a modest step up in price.
| Back | Closed |
|---|---|
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 2.70 dB standard deviation |
| Driver Type | Balanced armature |
| Drivers | 6 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 15Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 65 (measured by crinacle, via AutoEQ) |
| Impedance | 20 ohms |
| Sensitivity | 113 dB |
| Tonal Tilt | -0.55 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -6.5 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 | +1.8 dB | 0.70 |
| Peak | 166 Hz | -4.4 dB | 0.48 |
| Peak | 851 Hz | +3.4 dB | 1.06 |
| Peak | 2,720 Hz | +2.4 dB | 3.00 |
| Peak | 1,770 Hz | -1.3 dB | 2.18 |
| High shelf | 10,000 Hz | +6.5 dB | 0.70 |
| Peak | 5,650 Hz | +6.2 dB | 2.53 |
| Peak | 4,718 Hz | -4.5 dB | 3.03 |
| Peak | 8,599 Hz | +3.3 dB | 2.26 |
| Peak | 3,846 Hz | -1.8 dB | 6.00 |
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