Between the Px8 and HD 660S2, the Px8 comes out ahead in driver size and active noise cancellation, while the HD 660S2 wins on weight. Overall, the Px8 scores 67.4 and the HD 660S2 scores 61.4 on our Mars Score.
Which should you buy?
The Px8 edges ahead on the Mars Score (67.4 vs 61.4), but the 6.0-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Px8 if audio quality and feature breadth (ANC, codecs, multipoint) are the lead criteria for your purchase. The biggest gaps in its favor are driver size, active noise cancellation, multipoint, among others.
Pick the HD 660S2 if you carry the device everywhere and weight or thickness has been the deciding factor before. Its strongest claims are weight.
Both ship with comparable spatial audio, ldac, water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the Px8 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Bowers & Wilkins - Px8 wins
- ▲Driver size — 5.26% more. 40 mm vs 38 mm.
- ▲Has Active noise cancellation.
- ▲Has Multipoint.
- ▲Battery life: 30 h vs 0 h.
Why Sennheiser - HD 660S2 wins
- ▲Weight — 60.00 g less. 260 vs 320.
Spec comparison
Design
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 320 g | 260 glead |
| Water resistance | none | none |
Audio
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 40 mmlead | 38 mm |
| Impedanceⓘ | 32 Ω | 300 Ωlead |
| Sensitivityⓘ | 111 dBlead | 104 dB |
| Active noise cancellationⓘ | truelead | false |
| Transparency mode | truelead | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Battery life | 30 hlead | 0 h |
| Fast chargeⓘ | truelead | false |
Connectivity
| Spec | Bowers & Wilkins - Px8 | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 5.2lead | 0.0 |
| Multipointⓘ | truelead | false |
| 3.5mm jack | true | true |
| LDACⓘ | false | false |
| aptX HDⓘ | truelead | false |
Frequently asked
Which has better battery life, Px8 or HD 660S2?+
Px8 lasts 30 hours vs 0 hours.
Do Px8 or HD 660S2 have active noise cancellation?+
Px8 has ANC; HD 660S2 does not.
Which supports LDAC, Px8 or HD 660S2?+
Neither supports LDAC.
Spec-level deep dives
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