Between the MW75 and HD 660S2, the MW75 comes out ahead in driver size and active noise cancellation, while the HD 660S2 wins on weight. Overall, the MW75 scores 67.1 and the HD 660S2 scores 61.4 on our Mars Score.
Which should you buy?
The MW75 edges ahead on the Mars Score (67.1 vs 61.4), but the 5.7-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the MW75 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 MW75 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Master & Dynamic - MW75 wins
- ▲Driver size — 5.26% more. 40 mm vs 38 mm.
- ▲Has Active noise cancellation.
- ▲Has Multipoint.
- ▲Battery life: 28 h vs 0 h.
Why Sennheiser - HD 660S2 wins
- ▲Weight — 75.00 g less. 260 vs 335.
Spec comparison
Design
| Spec | Master & Dynamic - MW75 | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 335 g | 260 glead |
| Water resistance | none | none |
Audio
| Spec | Master & Dynamic - MW75 | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 40 mmlead | 38 mm |
| Impedanceⓘ | 32 Ω | 300 Ωlead |
| Sensitivityⓘ | 100 dB | 104 dBlead |
| Active noise cancellationⓘ | truelead | false |
| Transparency mode | truelead | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Master & Dynamic - MW75 | Sennheiser - HD 660S2 |
|---|---|---|
| Battery life | 28 hlead | 0 h |
| Fast chargeⓘ | truelead | false |
Connectivity
| Spec | Master & Dynamic - MW75 | 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, MW75 or HD 660S2?+
MW75 lasts 28 hours vs 0 hours.
Do MW75 or HD 660S2 have active noise cancellation?+
MW75 has ANC; HD 660S2 does not.
Which supports LDAC, MW75 or HD 660S2?+
Neither supports LDAC.
Spec-level deep dives
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