Short answer: a tie on sound quality. Both are rated 3.4/5 (#881 and #886 of 1291 in-ear headphones) at nearly the same price ($99.99 vs $99), so choose on features and fit.
What the FiiO FP3 does well: 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 tradeoff: 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.
Why pick the KBear Tourbillon Pro: A broadly balanced tuning with a preference score of 66 against the Harman target. The catch: Treble about 2 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Buy the FiiO FP3 or the KBear Tourbillon Pro on features: they are rated the same for sound quality at close to the same price.
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
A broadly balanced tuning with a preference score of 66 against the Harman target.
KeepHiFi $99.00 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 | KBear Tourbillon Pro | |
|---|---|---|
| Price | $99.99 | $99.00 |
| Ranked | #881 of 1291 in In-Ear Headphones | #886 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) | 66 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.72 dB standard deviation | 2.32 dB standard deviation |
| Tonal Tilt | -0.28 (negative is warmer, positive brighter) | -0.89 (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 (+0.5 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Planar magnetic | Dynamic |
| Drivers | 1 x 14.5mm planar magnetic | 1 x 10mm dynamic driver (PU + PEEK + DLC composite diaphragm) |
| Impedance | 36 ohms | 19 ohms |
| Sensitivity | 105 dB/mW | 101 dB/mW |
| Weight | 0 lbs (6.5 g) per earpiece | - |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | 20Hz - 20kHz |
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 KBear Tourbillon Pro from audioamigo, eplv, practiphile, pw, soundcheck39 and tonedeafmonk, all via squig.link.
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