Short answer: the FiiO FT1 Pro. It ranks #47 of 481 over-ear headphones by sound quality, rated 4.2/5, at $219.99; the Sennheiser HD 6XX ranks #73, rated 4.1/5, at $219.95. Close enough in price that the sound-quality gap is the deciding factor.
Why pick the FiiO FT1 Pro: Planar magnetic drivers with a 20 ohm impedance and 95 dB per milliwatt sensitivity make it easy to drive from a dongle or phone while delivering a preference score of 86. The catch: A 10 dB dip near 9.6 kHz and treble about 1 dB low soften cymbals and the upper edge of vocals, while a 3.5 dB peak near 2.9 kHz can add some forwardness.
What the Sennheiser HD 6XX does well: Measured response gives it an excellent Harman preference score of 84 with a 2.10 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural. Watch for: Sub-bass is 7.9 dB short at 30 Hz, so deep bass lacks rumble.
Buy the FiiO FT1 Pro. It is rated higher for sound quality, and saving $0.04 with the Sennheiser HD 6XX does not make up for the sound-quality gap.
Want more options? Browse the full Headphones rankings.
Planar magnetic drivers with a 20 ohm impedance and 95 dB per milliwatt sensitivity make it easy to drive from a dongle or phone while delivering a preference score of 86.
Amazon $219.99 Lowest AliExpress $253.40 eBay
Measured response gives it an excellent Harman preference score of 84 with a 2.10 dB spread, and its mids sit within about 0.5 dB of target, so vocals and instruments sound natural.
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Specifications Side By Side
| FiiO FT1 Pro | Sennheiser HD 6XX | |
|---|---|---|
| Price | $219.99 | $219.95 |
| Ranked | #47 of 481 in Over-Ear Headphones | #73 of 481 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Harman Preference Score | 86 (measured by oratory1990, via AutoEQ) | 84 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 2.16 dB standard deviation | 2.10 dB standard deviation |
| Tonal Tilt | -0.07 (negative is warmer, positive brighter) | -0.27 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.7 dB at 30 Hz) | Falls 6 dB below target at 40 Hz (-7.9 dB at 30 Hz) |
| Connection | Wired | Wired |
| Back | Open | Open |
| Driver Type | Planar magnetic | Dynamic |
| Drivers | 1 x 95x86mm planar magnetic | 1 x 42mm dynamic |
| Impedance | 20 ohms | 300 ohms |
| Sensitivity | 95 dB/mW | 103 dB/Vrms |
| Weight | 0.8 lbs (374 g) | 0.6 lbs (260g) |
| Frequency Response | 7Hz - 40kHz (Manufacturer specified) | 10Hz - 41kHz |
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 FT1 Pro from audioamigo, auricularesargentina, boizoff, daemonxar, dl, gadgetrytech, kr0mka, kuulokenurkka, listener, sai and superreview; the Sennheiser HD 6XX from audioamigo, daemonxar, gadgetrytech, hadoe, kuulokenurkka, ragnarok, sai and superreview, all via squig.link.
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