Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Beyerdynamic - Aventho 300 | Sennheiser - HD 660S2 |
|---|---|---|
| Driver size | 40 mm | 38 mm |
| Active noise cancellation | true | false |
| Multipoint | true | false |
| LDAC | true | false |
| Battery life | 60 h | 0 h |
Between the Aventho 300 and HD 660S2, the Aventho 300 comes out ahead in driver size / active noise cancellation, while the HD 660S2 wins on several specs. Overall, the Aventho 300 scores 76.4 and the HD 660S2 scores 51.2 on our Mars Score.
Which should you buy?
The Aventho 300 is the clear pick on raw spec strength, leading by 25.2 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Aventho 300 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. The single most decisive one: Driver size — 5.26% more. 40 mm vs 38 mm.
The HD 660S2 similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable spatial audio, weight, water resistance, so those specs do not separate the two — focus on the differences below.
Bottom line: the Aventho 300 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: Beyerdynamic - Aventho 300 or Sennheiser - HD 660S2?
Beyerdynamic - Aventho 300 leads the current Mars Score by 25.2 points.The more useful decision is the trade-off behind that result: compare driver size, battery life against the way you will actually use the product.
Choose Beyerdynamic - Aventho 300 if…
Beyerdynamic - Aventho 300 has the measurable edge on driver size mm, has anc, has multipoint.
Choose Sennheiser - HD 660S2 if…
Sennheiser - HD 660S2 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
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 - Aventho 300 wins
- ▲Driver size — 5.26% more. 40 mm vs 38 mm.
- ▲Has Active noise cancellation.
- ▲Has Multipoint.
- ▲Has LDAC.
- ▲Battery life: 60 h vs 0 h.
Why Sennheiser - HD 660S2 wins
- No decisive advantages.
Spec comparison
Design
| Spec | Beyerdynamic - Aventho 300 | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 260 g | 260 g |
| Water resistance | none | none |
Audio
| Spec | Beyerdynamic - Aventho 300 | 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 | Beyerdynamic - Aventho 300 | Sennheiser - HD 660S2 |
|---|---|---|
| Battery lifeⓘ | 60 hlead | 0 h |
| Fast chargeⓘ | truelead | false |
Connectivity
| Spec | Beyerdynamic - Aventho 300 | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 5.3lead | 0.0 |
| Multipointⓘ | truelead | false |
| 3.5mm jack | true | true |
| LDACⓘ | truelead | false |
| aptX HDⓘ | truelead | false |
Frequently asked
Which has better battery life, Aventho 300 or HD 660S2?+
Aventho 300 lasts 60 hours vs 0 hours.
Do Aventho 300 or HD 660S2 have active noise cancellation?+
Aventho 300 has active noise cancellation; HD 660S2 does not.
Which supports LDAC, Aventho 300 or HD 660S2?+
Aventho 300 supports LDAC; HD 660S2 does not.