Is the Sony WH-1000XM4 worth the upgrade from the STAX SR-Lambda Pro?
Verdict
Meaningful upgrade
The Sony WH-1000XM4 scores 6.0 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 value (7.0 to 8.0) and sound (8.5 to 9.0). On paper: active noise cancelling, weight 340 g to 254 g and multipoint pairing. One caution: this steps down a line tier (SR-Lambda Pro to WH-1000XM4), and base models usually trade away tier features - check the codec and ANC rows above before trusting the score gap alone. It's also $50 cheaper, which makes this an easy call. 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
- Value7.08.0
Spec differences
Only where the two genuinely differ - everything they share is omitted.
| Spec | SR-Lambda Pro | WH-1000XM4 | Direction |
|---|---|---|---|
| Active noise cancelling | No | Yes | |
| Weight | 340 g | 254 g | |
| Multipoint pairing | No | Yes | |
| Transparency mode | No | Yes | |
| Companion app | No | Yes | |
| Custom EQ | No | Yes | |
| Wear detection | No | Yes | |
| USB-C | No | Yes | |
| ANC type | none | adaptive | |
| Controls | none | touch | |
| Driver | Electrostatic | dynamic | |
| Frequency response | 8Hz-35kHz | 4 Hz - 40,000 Hz |
About this verdict
Direction matters here: this page answers "SR-Lambda Pro to WH-1000XM4". 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.