Short answer: the FiiO FT5. It ranks #281 of 481 over-ear headphones by sound quality, rated 3.4/5, at $499.99. The Sennheiser HDB 630 ranks #285, rated 3.3/5, at $489.95, $10.04 cheaper, which does not close the gap in sound quality.
The case for the FiiO FT5: Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural. The catch: Presence sits about 3.7 dB low with a 9.4 dB dip near 10.3 kHz, so vocals and instruments lose some bite.
Why pick the Sennheiser HDB 630: Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat. Watch for: Treble sits about 4.5 dB low, so it sounds a little dark.
Buy the FiiO FT5. It is rated higher for sound quality, and the $10.04 you would save on the Sennheiser HDB 630 does not close the gap.
Want more options? Browse the full Headphones rankings.
Lower mids sit within about 0.5 dB of target, keeping voices and guitars natural.
Amazon $499.99 eBay
Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat.
Amazon $489.95 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 FT5 | Sennheiser HDB 630 | |
|---|---|---|
| Price | $499.99 | $489.95 |
| Ranked | #281 of 481 in Over-Ear Headphones | #285 of 481 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Back | Open | Closed |
| Connection | Wired | Bluetooth |
| Driver Type | Planar magnetic | Dynamic |
| Drivers | 1 x 90mm planar magnetic | 1 x 42mm dynamic |
| Impedance | 36 ohms | - |
| Sensitivity | 96 dB/mW | - |
| Frequency Response | 7Hz - 40kHz | 6Hz - 40kHz |
| Weight | 1 lbs (456 g) | 0.7 lbs (311 g) |
| Harman Preference Score | 67 (median of 6 squig.link measurements, calibrated to AutoEQ) | 67 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.77 dB standard deviation | 2.37 dB standard deviation |
| Tonal Tilt | -0.73 (negative is warmer, positive brighter) | -1.11 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-4.9 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+2.6 dB at 30 Hz) |
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 FT5 from gadgetrytech, kr0mka, kuulokenurkka, sai, superreview and vsg; the Sennheiser HDB 630 from auricularesargentina, filk, gadgetrytech, kr0mka, kuulokenurkka, sai and superreview, all via squig.link.
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