Short answer: the FiiO FX15. Both are rated 3.8/5 for sound quality (#551 and #596 of 1291 in-ear headphones), and the FiiO FX15 costs $699.99 against $799 for the Unique Melody Stardust, and with sound quality even, the cheaper one is the better buy.
The case for the FiiO FX15: Its hybrid of one 10mm dynamic driver, one balanced armature and four electrostatic tweeters delivers a warm, gently V-shaped sound with a preference score of 72 across seven hobbyist measurements. Watch for: A 7.4 dB peak near 8.1 kHz next to a 4.8 dB dip near 6.1 kHz makes cymbals and sibilants uneven, with some edge on bright tracks.
The case for the Unique Melody Stardust: A six driver hybrid with two dynamic drivers and four balanced armatures in a 3D printed titanium shell. The tradeoff: Treble sits about 4.3 dB below target, a dark, relaxed balance.
Buy the FiiO FX15. Both are rated the same for sound quality, and it costs $99.01 less than the Unique Melody Stardust.
Looking for alternatives? See the complete Headphones rankings.
Its hybrid of one 10mm dynamic driver, one balanced armature and four electrostatic tweeters delivers a warm, gently V-shaped sound with a preference score of 72 across seven hobbyist measurements.
Amazon $699.99 eBay
A six driver hybrid with two dynamic drivers and four balanced armatures in a 3D printed titanium shell.
HiFiGo $799.00 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
| FiiO FX15 | Unique Melody Stardust | |
|---|---|---|
| Price | $699.99 | $799.00 |
| Ranked | #551 of 1291 in In-Ear Headphones | #596 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 72 (median of 7 squig.link measurements, calibrated to AutoEQ) | 71 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.15 dB standard deviation | 2.08 dB standard deviation |
| Tonal Tilt | -0.36 (negative is warmer, positive brighter) | -0.57 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.1 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 (1 dynamic + 1 balanced armature + 4 electrostatic) | Hybrid |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature + 4 x electrostatic | 2 x dynamic + 4 x balanced armature |
| Impedance | 24 ohms | - |
| Sensitivity | 103 dB/mW | 106 dB @1kHz |
| Weight | 0 lbs (6 g) per earpiece | - |
| Frequency Response | 20Hz - 40kHz (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 FiiO FX15 from dchpgall, jaytiss, precog, silicagel, superreview, timmyv and vsg; the Unique Melody Stardust from atechreviews, elrics, jaytiss, silicagel, sl0the, tonedeafmonk and zerostresslevel, all via squig.link.
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