Short answer: the TOZO Golden X1. Both are rated 3.6/5 for sound quality (#775 and #720 of 1291 in-ear headphones), and the TOZO Golden X1 costs $149.99 against $164.99 for the FiiO FD15, with sound quality a draw, the lower price decides it.
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. Watch for: 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.
Why pick the TOZO Golden X1: A broadly balanced tuning with a preference score of 68 against the Harman target. The catch: An uneven response, 2.1 dB standard deviation from target.
Buy the TOZO Golden X1. Both are rated the same for sound quality, and it costs $15 less than the FiiO FD15.
Still deciding? The full Headphones rankings cover every ranked option.
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 eBay
A broadly balanced tuning with a preference score of 68 against the Harman target.
Amazon $149.99 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
| FiiO FD15 | TOZO Golden X1 | |
|---|---|---|
| Price | $164.99 | $149.99 |
| Ranked | #720 of 1291 in In-Ear Headphones | #775 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (median of 7 squig.link measurements, calibrated to AutoEQ) | 68 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.52 dB standard deviation | 2.11 dB standard deviation |
| Tonal Tilt | -0.30 (negative is warmer, positive brighter) | -1.01 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+3.0 dB at 30 Hz) |
| Connection | Wired | Bluetooth |
| Driver Type | Dynamic | Hybrid |
| Drivers | 1 x 13.8mm dynamic | 1 Dynamic (12mm), 1 Balanced Armature |
| Impedance | 32 ohms | - |
| Sensitivity | 112 dB/mW | - |
| Weight | 0 lbs (12 g) per earbud | - |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | - |
| Bluetooth | - | Yes |
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 FD15 from boizoff, breampike, ekaudio, iemocean, jaytiss, pw and timmyv; the TOZO Golden X1 from boizoff, fernandagunsan and vortexreviews, all via squig.link.
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