Short answer: the Sivga P2-Pro. Both are rated 3.3/5 for sound quality (#292 and #285 of 481 over-ear headphones), and the Sivga P2-Pro costs $449 against $489.95 for the Sennheiser HDB 630, with sound quality a draw, the lower price decides it.
What the Sennheiser HDB 630 does well: 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.
Why pick the Sivga P2-Pro: A broadly balanced tuning with a preference score of 66 against the Harman target. The tradeoff: Treble about 3 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Buy the Sivga P2-Pro. Both are rated the same for sound quality, and it costs $40.95 less than the Sennheiser HDB 630.
Looking for alternatives? See the complete Headphones rankings.
Bass sits close to target and holds down to 20 Hz, so low end sounds full without bloat.
Amazon $489.95 eBay
A broadly balanced tuning with a preference score of 66 against the Harman target.
Sivga Audio $449.00 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
| Sennheiser HDB 630 | Sivga P2-Pro | |
|---|---|---|
| Price | $489.95 | $449.00 |
| Ranked | #285 of 481 in Over-Ear Headphones | #292 of 481 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Back | Closed | Open |
| Connection | Bluetooth | Wired |
| Driver Type | Dynamic | Planar Magnetic |
| Drivers | 1 x 42mm dynamic | 97mm x 76mm planar magnetic driver (sapphire vibration circuit) |
| Frequency Response | 6Hz - 40kHz | 20Hz - 40kHz |
| Weight | 0.7 lbs (311 g) | 1 lbs (435g) |
| Harman Preference Score | 67 (median of 7 squig.link measurements, calibrated to AutoEQ) | 66 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.37 dB standard deviation | 2.98 dB standard deviation |
| Tonal Tilt | -1.11 (negative is warmer, positive brighter) | -0.66 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-5.1 dB at 30 Hz) |
| Impedance | - | 32 ohms |
| Sensitivity | - | 98 dB |
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 Sennheiser HDB 630 from auricularesargentina, filk, gadgetrytech, kr0mka, kuulokenurkka, sai and superreview; the Sivga P2-Pro from auricularesargentina, gadgetrytech and iemworld, all via squig.link.
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