Is the Sennheiser HDB 630 worth the upgrade from the STAX SR-Lambda Pro?
Verdict
Meaningful upgrade
The Sennheiser HDB 630 scores 5.0 points above the STAX SR-Lambda Pro. That's a real improvement, though not the kind you'd notice on every track. The gains are concentrated in sound (8.5 to 9.0) and value (7.0 to 7.5). On paper: active noise cancelling, weight 340 g to 311 g and multipoint pairing. Worth checking: drivers per side goes 2 to 1. One caution: this steps down a line tier (SR-Lambda Pro to HDB 630), and base models usually trade away tier features - check the codec and ANC rows above before trusting the score gap alone. That costs $100 more, or about $20 per point of score - reasonable value for the jump. Worth doing if you're replacing anyway; harder to justify as a pure upgrade if what you have still works.
What actually changes
Sub-scores both products have, on the same 0-10 scale. Bars extend right for a gain, left for a loss.
- Sound8.59.0
- Value7.07.5
Spec differences
Only where the two genuinely differ - everything they share is omitted.
| Spec | SR-Lambda Pro | HDB 630 | Direction |
|---|---|---|---|
| Active noise cancelling | No | Yes | |
| Weight | 340 g | 311 g | |
| Multipoint pairing | No | Yes | |
| Drivers per side | 2 | 1 | |
| Transparency mode | No | Yes | |
| Companion app | No | Yes | |
| Custom EQ | No | Yes | |
| Wear detection | No | Yes | |
| USB-C | No | Yes | |
| ANC type | none | hybrid | |
| Controls | none | touch | |
| Driver | Electrostatic | dynamic | |
| Frequency response | 8 Hz - 35 kHz | 6 Hz - 40 kHz |
About this verdict
Direction matters here: this page answers "SR-Lambda Pro to HDB 630". The other direction is a separate question with a different answer. Scores blend published review verdicts across over-ear and shift as new reviews land, so a marginal call today may not be one next quarter.