Beyerdynamic - DT 1990 Pro MK II vs Sennheiser - HD 660S2
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Beyerdynamic - DT 1990 Pro MK II | Sennheiser - HD 660S2 |
|---|---|---|
| Weight | 350 g | 260 g |
| Driver size | 45 mm | 42 mm |
Between the DT 1990 Pro MK II and HD 660S2, the DT 1990 Pro MK II comes out ahead in driver size, while the HD 660S2 wins on weight. Overall, the DT 1990 Pro MK II scores 51.4 and the HD 660S2 scores 52.5 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (51.4 vs 52.5). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the DT 1990 Pro MK II if you care most about driver size. The biggest gaps in its favor are driver size. 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 — 90.00 g less. 260 vs 350.
Both ship with comparable battery life, active noise cancellation, spatial audio, so those specs do not 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 says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Beyerdynamic - DT 1990 Pro MK II or Sennheiser - HD 660S2?
Sennheiser - HD 660S2 leads the current Mars Score by 1.1 points.The more useful decision is the trade-off behind that result: compare driver size, weight against the way you will actually use the product.
Choose Beyerdynamic - DT 1990 Pro MK II if…
Beyerdynamic - DT 1990 Pro MK II has the measurable edge on driver size mm.
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 Beyerdynamic - DT 1990 Pro MK II wins
- ▲Driver size — 7.14% more. 45 mm vs 42 mm.
Why Sennheiser - HD 660S2 wins
- ▲Weight — 90.00 g less. 260 vs 350.
Spec comparison
Design
| Spec | Beyerdynamic - DT 1990 Pro MK II | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 350 g | 260 glead |
| Water resistance | none | none |
Audio
| Spec | Beyerdynamic - DT 1990 Pro MK II | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 45 mmlead | 42 mm |
| Impedanceⓘ | 250 Ω | 300 Ωlead |
| Sensitivityⓘ | 102 dB | 104 dBlead |
| Active noise cancellationⓘ | false | false |
| Transparency mode | false | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Beyerdynamic - DT 1990 Pro MK II | Sennheiser - HD 660S2 |
|---|---|---|
| Battery lifeⓘ | 0 h | 0 h |
| Fast chargeⓘ | false | false |
Connectivity
| Spec | Beyerdynamic - DT 1990 Pro MK II | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 0 | 0 |
| Multipointⓘ | false | false |
| 3.5mm jack | true | true |
| LDACⓘ | false | false |
| aptX HDⓘ | false | false |
Frequently asked
Which has better battery life, DT 1990 Pro MK II or HD 660S2?+
HD 660S2 lasts 0 hours vs 0 hours.
Do DT 1990 Pro MK II or HD 660S2 have active noise cancellation?+
Neither model has active noise cancellation.
Which supports LDAC, DT 1990 Pro MK II or HD 660S2?+
Neither supports LDAC.