The FiiO FD15 ranks #522 out of 946 total In-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: Fiio
Prices on this page were last checked October 13, 2026 at 3:17 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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#522 FiiO FD15: $164.99 Amazon $164.99 eBay
Pros: A large 13.8mm dynamic driver with 32 ohm impedance and 112 dB/mW sensitivity makes it easy to drive loud from a phone. Bass and low mids sit within half a decibel of target on the median of seven squig.link measurements, so the low end sounds clean and controlled rather than boomy. The relaxed upper range suits listeners who are sensitive to sharp treble.
Cons: 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. Sub-bass falls 3.5 dB short under 60 Hz, which trims the rumble from electronic and film soundtracks. The CrinEar Nightfall carries the same rating for considerably less.
| Back | Closed |
|---|---|
| Connection | Wired |
| Deviation From Target | 2.52 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 13.8mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 69 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 112 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
| Tonal Tilt | -0.30 (negative is warmer, positive brighter) |
| Weight | 0 lbs (12 g) per earbud |
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