Short answer: the Moondrop Dark Saber. It ranks #24 of 1291 in-ear headphones by sound quality, rated 4.9/5, at $899.99; the Symphonium Audio Helios ranks #93, rated 4.5/5, and costs $1,099, which makes this an easy call rather than a real tradeoff.
The Moondrop Dark Saber is the better-sounding choice. Across ten hobbyist measurements on squig.link, the Dark Saber tracks the target unusually closely, with only about 1.1 dB of unevenness and a preference score of 84. The catch: The presence and lower treble regions sit about 2 dB below target with a 5.4 dB dip near 6.5 kHz, so some listeners will find vocals and cymbals slightly recessed and soft.
Why pick the Symphonium Audio Helios: One of the smoothest in-ears measured, with a 1.57 dB standard deviation from the Harman target and a preference score of 80. The tradeoff: The presence region from 3 to 6 kHz sits 3.5 dB below target, with a 6.3 dB dip near 6.95 kHz, so vocals and guitars lose a little bite and detail.
Buy the Moondrop Dark Saber. It is rated higher for sound quality than the Symphonium Audio Helios and costs less, so only choose the other one for a particular feature it does better.
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Across ten hobbyist measurements on squig.link, the Dark Saber tracks the target unusually closely, with only about 1.1 dB of unevenness and a preference score of 84.
Amazon $899.99 eBay
One of the smoothest in-ears measured, with a 1.57 dB standard deviation from the Harman target and a preference score of 80.
Headphones.com $1,099.00 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
| Moondrop Dark Saber | Symphonium Audio Helios | |
|---|---|---|
| Price | $899.99 | $1,099.00 |
| Ranked | #24 of 1291 in In-Ear Headphones | #93 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 84 (median of 10 squig.link measurements, calibrated to AutoEQ) | 80 (measured by HypetheSonics, via AutoEQ) |
| Deviation From Target | 1.12 dB standard deviation | 1.57 dB standard deviation |
| Tonal Tilt | -0.15 (negative is warmer, positive brighter) | +0.02 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.3 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (2 dynamic + 8 balanced armature) | Balanced armature |
| Drivers | 2 x 10mm dynamic + 8 x balanced armature | - |
| Impedance | 22 ohms | 8.5 ohms |
| Sensitivity | 128 dB/Vrms | 104 dB/Vrms |
| Frequency Response | 7Hz - 41kHz (Manufacturer specified) | 12Hz - 24kHz (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 Moondrop Dark Saber from aftersound, ankramutt, bloomaudio, csi-zone, jaytiss, musicafe, precog, sl0the, soundignity and superreview; the Symphonium Audio Helios from achoreviews, aden, aftersound, animagus, banzai1122, bloomaudio, cqtek, eliseaudio, freeryder05, harutohiroki, hbb, nymz, precog, recode, smirk, superreview, tgx78, timmyv and vsg, all via squig.link.
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