Between the ATH-MSR7b and HD 660S2, the ATH-MSR7b comes out ahead in driver size, while the HD 660S2 wins on weight. Overall, the ATH-MSR7b scores 66.2 and the HD 660S2 scores 61.4 on our Mars Score.
Which should you buy?
The ATH-MSR7b edges ahead on the Mars Score (66.2 vs 61.4), but the 4.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the ATH-MSR7b if you care most about driver size. The biggest gaps in its favor are driver size.
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 battery life, active noise cancellation, spatial audio, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Audio-Technica - ATH-MSR7b wins
- ▲Driver size — 18.42% more. 45 mm vs 38 mm.
Why Sennheiser - HD 660S2 wins
- ▲Weight — 30.00 g less. 260 vs 290.
Spec comparison
Design
| Spec | Audio-Technica - ATH-MSR7b | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 290 g | 260 glead |
| Water resistance | none | none |
Audio
| Spec | Audio-Technica - ATH-MSR7b | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 45 mmlead | 38 mm |
| Impedanceⓘ | 36 Ω | 300 Ωlead |
| Sensitivityⓘ | 101 dB | 104 dBlead |
| Active noise cancellationⓘ | false | false |
| Transparency mode | false | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Audio-Technica - ATH-MSR7b | Sennheiser - HD 660S2 |
|---|---|---|
| Battery life | 0 h | 0 h |
| Fast chargeⓘ | false | false |
Connectivity
| Spec | Audio-Technica - ATH-MSR7b | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 0.0 | 0.0 |
| Multipointⓘ | false | false |
| 3.5mm jack | true | true |
| LDACⓘ | false | false |
| aptX HDⓘ | false | false |
Frequently asked
Which has better battery life, ATH-MSR7b or HD 660S2?+
HD 660S2 lasts 0 hours vs 0 hours.
Do ATH-MSR7b or HD 660S2 have active noise cancellation?+
Neither model has ANC.
Which supports LDAC, ATH-MSR7b or HD 660S2?+
Neither supports LDAC.
Spec-level deep dives
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