Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Sennheiser - HD 660S2 | Sennheiser - HD 800 S |
|---|---|---|
| Weight | 260 g | 330 g |
| Driver size | 42 mm | 56 mm |
Between the HD 660S2 and HD 800 S, the HD 660S2 comes out ahead in weight, while the HD 800 S wins on driver size. Overall, the HD 660S2 scores 52.5 and the HD 800 S scores 55.3 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (52.5 vs 55.3). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the HD 660S2 if you carry the device everywhere and weight or thickness has been the deciding factor before. The biggest gaps in its favor are weight. The single most decisive one: Weight — 70.00 g less. 260 vs 330.
Pick the HD 800 S if you care most about driver size. Its strongest claims are driver size. The single most decisive one: Driver size — 33.33% more. 56 mm vs 42 mm.
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: Sennheiser - HD 660S2 or Sennheiser - HD 800 S?
Sennheiser - HD 800 S leads the current Mars Score by 2.8 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 Sennheiser - HD 660S2 if…
Sennheiser - HD 660S2 has the measurable edge on weight g.
Choose Sennheiser - HD 800 S if…
Sennheiser - HD 800 S has the measurable edge on driver size mm.
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 Sennheiser - HD 660S2 wins
- ▲Weight — 70.00 g less. 260 vs 330.
Why Sennheiser - HD 800 S wins
- ▲Driver size — 33.33% more. 56 mm vs 42 mm.
Spec comparison
Design
| Spec | Sennheiser - HD 660S2 | Sennheiser - HD 800 S |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 260 glead | 330 g |
| Water resistance | none | none |
Audio
| Spec | Sennheiser - HD 660S2 | Sennheiser - HD 800 S |
|---|---|---|
| Driver sizeⓘ | 42 mm | 56 mmlead |
| Impedanceⓘ | 300 Ω | 300 Ω |
| Sensitivityⓘ | 104 dBlead | 102 dB |
| Active noise cancellationⓘ | false | false |
| Transparency mode | false | false |
| Spatial audioⓘ | false | false |
Battery
| Spec | Sennheiser - HD 660S2 | Sennheiser - HD 800 S |
|---|---|---|
| Battery lifeⓘ | 0 h | 0 h |
| Fast chargeⓘ | false | false |
Connectivity
| Spec | Sennheiser - HD 660S2 | Sennheiser - HD 800 S |
|---|---|---|
| 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, HD 660S2 or HD 800 S?+
HD 800 S lasts 0 hours vs 0 hours.
Do HD 660S2 or HD 800 S have active noise cancellation?+
Neither model has active noise cancellation.
Which supports LDAC, HD 660S2 or HD 800 S?+
Neither supports LDAC.