Audio-Technica - ATH-M50xBT2 vs Sennheiser - HD 660S2
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Audio-Technica - ATH-M50xBT2 | Sennheiser - HD 660S2 |
|---|---|---|
| Weight | 307 g | 260 g |
| Driver size | 45 mm | 42 mm |
| Multipoint | true | false |
| LDAC | true | false |
| Battery life | 50 h | 0 h |
Between the ATH-M50xBT2 and HD 660S2, the ATH-M50xBT2 comes out ahead in driver size / multipoint, while the HD 660S2 wins on weight. Overall, the ATH-M50xBT2 scores 59.8 and the HD 660S2 scores 52.5 on our Mars Score.
Which should you buy?
The ATH-M50xBT2 edges ahead on the Mars Score (59.8 vs 52.5), but the 7.3-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the ATH-M50xBT2 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, multipoint, ldac, among others. The single most decisive one: Driver size — 7.14% more. 45 mm vs 42 mm.
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. The single most decisive one: Weight — 47.00 g less. 260 vs 307.
Both ship with comparable active noise cancellation, spatial audio, water resistance, so those specs do not separate the two — focus on the differences below.
Bottom line: the ATH-M50xBT2 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Audio-Technica - ATH-M50xBT2 or Sennheiser - HD 660S2?
Audio-Technica - ATH-M50xBT2 leads the current Mars Score by 7.3 points.The more useful decision is the trade-off behind that result: compare driver size, battery life, weight against the way you will actually use the product.
Choose Audio-Technica - ATH-M50xBT2 if…
Audio-Technica - ATH-M50xBT2 has the measurable edge on driver size mm, has multipoint, supports ldac.
Choose Sennheiser - HD 660S2 if…
Sennheiser - HD 660S2 has the measurable edge on weight g.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Audio-Technica - ATH-M50xBT2 wins
- ▲Driver size — 7.14% more. 45 mm vs 42 mm.
- ▲Has Multipoint.
- ▲Has LDAC.
- ▲Battery life: 50 h vs 0 h.
Why Sennheiser - HD 660S2 wins
- ▲Weight — 47.00 g less. 260 vs 307.
Spec comparison
Design
| Spec | Audio-Technica - ATH-M50xBT2 | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 307 g | 260 glead |
| Water resistance | none | none |
Audio
| Spec | Audio-Technica - ATH-M50xBT2 | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 45 mmlead | 42 mm |
| Impedanceⓘ | 38 Ω | 300 Ωlead |
| Sensitivityⓘ | 99 dB | 104 dBlead |
| Active noise cancellationⓘ | false | false |
| Transparency mode | false | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Audio-Technica - ATH-M50xBT2 | Sennheiser - HD 660S2 |
|---|---|---|
| Battery lifeⓘ | 50 hlead | 0 h |
| Fast chargeⓘ | truelead | false |
Connectivity
| Spec | Audio-Technica - ATH-M50xBT2 | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 5.0lead | 0 |
| Multipointⓘ | truelead | false |
| 3.5mm jack | true | true |
| LDACⓘ | truelead | false |
| aptX HDⓘ | truelead | false |
Frequently asked
Which has better battery life, ATH-M50xBT2 or HD 660S2?+
ATH-M50xBT2 lasts 50 hours vs 0 hours.
Do ATH-M50xBT2 or HD 660S2 have active noise cancellation?+
Neither model has active noise cancellation.
Which supports LDAC, ATH-M50xBT2 or HD 660S2?+
ATH-M50xBT2 supports LDAC; HD 660S2 does not.