Between the Studio Pro and HD 660S2, the Studio Pro comes out ahead in driver size and active noise cancellation, while the HD 660S2 wins on several specs. Overall, the Studio Pro scores 69.2 and the HD 660S2 scores 61.4 on our Mars Score.
Which should you buy?
The Studio Pro edges ahead on the Mars Score (69.2 vs 61.4), but the 7.8-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Studio Pro 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, spatial audio, among others.
The HD 660S2 similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable weight, ldac, water resistance, so those specs don't separate the two — focus on the differences below.
Bottom line: the Studio Pro is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Apple - Studio Pro wins
- ▲Driver size — 5.26% more. 40 mm vs 38 mm.
- ▲Has Active noise cancellation.
- ▲Has Spatial audio.
- ▲Has Multipoint.
- ▲Battery life: 40 h vs 0 h.
Why Sennheiser - HD 660S2 wins
- No decisive advantages.
Spec comparison
Design
| Spec | Apple - Studio Pro | Sennheiser - HD 660S2 |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 260 g | 260 g |
| Water resistance | none | none |
Audio
| Spec | Apple - Studio Pro | Sennheiser - HD 660S2 |
|---|---|---|
| Driver sizeⓘ | 40 mmlead | 38 mm |
| Impedanceⓘ | 32 Ω | 300 Ωlead |
| Sensitivityⓘ | 108 dBlead | 104 dB |
| Active noise cancellationⓘ | truelead | false |
| Transparency mode | truelead | false |
| Spatial audioⓘ | truelead | false |
Battery
| Spec | Apple - Studio Pro | Sennheiser - HD 660S2 |
|---|---|---|
| Battery life | 40 hlead | 0 h |
| Fast chargeⓘ | truelead | false |
Connectivity
| Spec | Apple - Studio Pro | Sennheiser - HD 660S2 |
|---|---|---|
| Bluetoothⓘ | 5.3lead | 0.0 |
| Multipointⓘ | truelead | false |
| 3.5mm jack | true | true |
| LDACⓘ | false | false |
| aptX HDⓘ | false | false |
Frequently asked
Which has better battery life, Studio Pro or HD 660S2?+
Studio Pro lasts 40 hours vs 0 hours.
Do Studio Pro or HD 660S2 have active noise cancellation?+
Studio Pro has ANC; HD 660S2 does not.
Which supports LDAC, Studio Pro or HD 660S2?+
Neither supports LDAC.
Spec-level deep dives
More from the same brands
vsMars is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more.