Short answer: the ROSESELSA CJ20. It ranks #679 of 1291 in-ear headphones by sound quality, rated 3.7/5, at $169; the FiiO FD15 ranks #720, rated 3.6/5, at $164.99. Close enough in price that the sound-quality gap is the deciding factor.
Why pick the ROSESELSA CJ20: A broadly balanced tuning with a preference score of 70 against the Harman target. The tradeoff: An uneven response, 2.2 dB standard deviation from target.
What the FiiO FD15 does well: A large 13.8mm dynamic driver with 32 ohm impedance and 112 dB/mW sensitivity makes it easy to drive loud from a phone. The catch: Presence sits 5.8 dB below target with an 8.4 dB dip at 6.5 kHz, so vocals lose clarity and cymbals sound dull, and treble from 6 to 10 kHz is down 4.1 dB as well.
Buy the ROSESELSA CJ20. It is rated higher for sound quality, and the $4.01 saving on the FiiO FD15 is not enough to make up the difference.
Looking for alternatives? See the complete Headphones rankings.
A broadly balanced tuning with a preference score of 70 against the Harman target.
HiFiGo $169 eBay
A large 13.8mm dynamic driver with 32 ohm impedance and 112 dB/mW sensitivity makes it easy to drive loud from a phone.
Amazon $164.99 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
| ROSESELSA CJ20 | FiiO FD15 | |
|---|---|---|
| Price | $169 | $164.99 |
| Ranked | #679 of 1291 in In-Ear Headphones | #720 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 70 (median of 3 squig.link measurements, calibrated to AutoEQ) | 69 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.15 dB standard deviation | 2.52 dB standard deviation |
| Tonal Tilt | -0.47 (negative is warmer, positive brighter) | -0.30 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.3 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
| Connection | Wired (3.5mm) | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 Dynamic (10mm topological) | 1 x 13.8mm dynamic |
| Impedance | - | 32 ohms |
| Sensitivity | - | 112 dB/mW |
| Weight | - | 0 lbs (12 g) per earbud |
| Frequency Response | - | 10Hz - 40kHz (Manufacturer specified) |
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 ROSESELSA CJ20 from aftersound, atechreviews, audioamigo, hbb, jaytiss and lestat; the FiiO FD15 from boizoff, breampike, ekaudio, iemocean, jaytiss, pw and timmyv, all via squig.link.
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