Short answer: the FiiO FX15. It ranks #551 of 1291 in-ear headphones by sound quality, rated 3.8/5, at $699.99; the ISN Audio EBC80 ranks #628, rated 3.7/5, at $699. With prices this close, go by the sound-quality ranking rather than the cost.
Why pick 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. The tradeoff: 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 ISN Audio EBC80: An unusual eight driver hybrid combines dynamic, balanced armature, electrostatic and bone conduction drivers in each earpiece. The tradeoff: Low mids sit about 2.2 dB above target, which thickens male vocals and can make busy mixes sound slightly congested, and its preference score of 69.9 comes with a less even 2.18 dB deviation.
Buy the FiiO FX15. It is rated higher for sound quality, and the $0.99 you would save on the ISN Audio EBC80 does not close the gap.
Still deciding? The full Headphones rankings cover every ranked option.
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
An unusual eight driver hybrid combines dynamic, balanced armature, electrostatic and bone conduction drivers in each earpiece.
Amazon $699.00 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 | ISN Audio EBC80 | |
|---|---|---|
| Price | $699.99 | $699.00 |
| Ranked | #551 of 1291 in In-Ear Headphones | #628 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) | 70 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.15 dB standard deviation | 2.18 dB standard deviation |
| Tonal Tilt | -0.36 (negative is warmer, positive brighter) | -0.55 (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 (-1.2 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 balanced armature + 4 electrostatic) | Hybrid (2 dynamic + 2 balanced armature + 2 electrostatic + 2 bone conduction) |
| Drivers | 1 x 10mm dynamic + 1 x balanced armature + 4 x electrostatic | 2 x dynamic + 2 x balanced armature + 2 x electrostatic + 2 x bone conduction |
| Impedance | 24 ohms | 13 ohms |
| Sensitivity | 103 dB/mW | 106 dB |
| Weight | 0 lbs (6 g) per earpiece | - |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | - |
| Built-in Microphone | No | 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 ISN Audio EBC80 from ducbloke, eliseaudio, flare, jaytiss, lown-fi and pw, all via squig.link.
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