Short answer: the FiiO FP3. Both are rated 3.4/5 for sound quality (#881 and #850 of 1291 in-ear headphones), and the FiiO FP3 costs $99.99 against $109 for the Letshuoer DX1, so with nothing between them on sound quality, price settles it.
Why pick the FiiO FP3: Its 14.5mm planar magnetic driver reaches a Harman preference score of 65.8 across six hobbyist measurements on squig.link, with sub-bass held within about half a dB of target so deep bass is present but not exaggerated. The catch: The treble is uneven, with a 6.7 dB peak near 7.9 kHz followed by a 5.7 dB dip near 10.2 kHz, so cymbals can sound sharp and then lose sparkle.
What the Letshuoer DX1 does well: Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural. The tradeoff: Presence sits about 6.2 dB low with an 8.9 dB dip near 10.3 kHz, so vocals and instruments lose some bite.
Buy the FiiO FP3. Both are rated the same for sound quality, and it costs $9.01 less than the Letshuoer DX1.
Still deciding? The full Headphones rankings cover every ranked option.
Its 14.5mm planar magnetic driver reaches a Harman preference score of 65.8 across six hobbyist measurements on squig.link, with sub-bass held within about half a dB of target so deep bass is present but not exaggerated.
Amazon $99.99 eBay
Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural.
Amazon $109.00 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 FP3 | Letshuoer DX1 | |
|---|---|---|
| Price | $99.99 | $109.00 |
| Ranked | #881 of 1291 in In-Ear Headphones | #850 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 66 (median of 6 squig.link measurements, calibrated to AutoEQ) | 67 (median of 18 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.72 dB standard deviation | 2.51 dB standard deviation |
| Tonal Tilt | -0.28 (negative is warmer, positive brighter) | -0.40 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-2.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Planar magnetic | Dynamic |
| Drivers | 1 x 14.5mm planar magnetic | 1 x 11mm dynamic |
| Impedance | 36 ohms | 30 ohms |
| Sensitivity | 105 dB/mW | - |
| Weight | 0 lbs (6.5 g) per earpiece | - |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | 20Hz - 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 FiiO FP3 from atechreviews, audioamigo, dchpgall, jaytiss, koi and practiphile; the Letshuoer DX1 from aftersound, arn, atechreviews, audioamigo, cqtek, dl, hbb, hu-fi, jaytiss, joycesreview, kazi, koi, practiphile, pw, soundcheck39, superreview, theaudiostore, tonedeafmonk, treblewellxtended and zerostresslevel, all via squig.link.
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