Between the Beoplay HX and HD 660S2, the Beoplay HX comes out ahead in driver size and active noise cancellation, while the HD 660S2 wins on weight. Overall, the Beoplay HX scores 68.3 and the HD 660S2 scores 61.4 on our Mars Score.
Which should you buy?
The Beoplay HX edges ahead on the Mars Score (68.3 vs 61.4), but the 6.9-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Beoplay HX 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 Beoplay HX is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Bang & Olufsen - Beoplay HX wins
- ▲Driver size — 5.26% more. 40 mm vs 38 mm.
- ▲Has Active noise cancellation.
- ▲Has Multipoint.
- ▲Battery life: 35 h vs 0 h.
Why Sennheiser - HD 660S2 wins
- ▲Weight — 25.00 g less. 260 vs 285.
Spec comparison
Design
| Spec | Bang & Olufsen - Beoplay HX | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 285 g | 260 glead |
| Water resistance | none | none |
Audio
| Spec | Bang & Olufsen - Beoplay HX | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 40 mmlead | 38 mm |
| Impedanceⓘ | 21 Ω | 300 Ωlead |
| Sensitivityⓘ | 96 dB | 104 dBlead |
| Active noise cancellationⓘ | truelead | false |
| Transparency mode | truelead | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Bang & Olufsen - Beoplay HX | Sennheiser - HD 660S2 |
|---|---|---|
| Battery life | 35 hlead | 0 h |
| Fast chargeⓘ | truelead | false |
Connectivity
| Spec | Bang & Olufsen - Beoplay HX | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 5.1lead | 0.0 |
| Multipointⓘ | truelead | false |
| 3.5mm jack | true | true |
| LDACⓘ | false | false |
| aptX HDⓘ | truelead | false |
Frequently asked
Which has better battery life, Beoplay HX or HD 660S2?+
Beoplay HX lasts 35 hours vs 0 hours.
Do Beoplay HX or HD 660S2 have active noise cancellation?+
Beoplay HX has ANC; HD 660S2 does not.
Which supports LDAC, Beoplay HX or HD 660S2?+
Neither supports LDAC.
Spec-level deep dives
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