Based on our overall comparison score, Sennheiser Momentum 4 rates higher at 87/100 versus 35/100 for Sennheiser HD 660S2 — a 52-point lead. Sennheiser Momentum 4 is the stronger overall pick, though the right choice still depends on which specs matter most to you; the full spec table above breaks down every difference.
Sennheiser Momentum 4 vs Sennheiser HD 660S2
Verdict
Our overall take, at a glance
Key takeaways
- Sennheiser Momentum 4 leads Sennheiser HD 660S2 overall by 50 points (79 vs 29 out of 100).
- Sennheiser Momentum 4 stands out on Audio Driver Size: 42 mm.
Sennheiser Momentum 4 leads overall
Sennheiser Momentum 4
79
Sennheiser HD 660S2
29
Why it stands out
- Audio Driver Size: 42 mm
In-depth analysisAI
AI-generated from the cited sources — may be incomplete or inaccurate; verify important details before deciding · generated Jun 2026.
Sennheiser Momentum 4
The Sennheiser Momentum 4 are over-ear wireless headphones designed for listeners who prioritize sound fidelity and long battery life. Despite being on the market for multiple years, they remain a prominent option in the active noise-canceling space. They offer a blend of high-quality audio reproduction, wireless connectivity, and active noise reduction.
Best for Long-haul travel requiring class-leading battery enduranceBest for Listeners seeking premium sound quality without paying the premium of the absolu
Pros
- Exceptional battery performance that minimizes the need for frequent charging
- High-fidelity audio quality that remains competitive with newer industry standards
- Capable active noise cancellation for daily commutes and travel
Cons
- Slightly outdated technology implementation compared to newer flagship rivals
- Minor software and usability rough edges in everyday operation
Sennheiser HD 660S2
The Sennheiser HD 660S2 is a reference headphone model known for its clear, detailed, and warm sound signature. The design includes rich black velour earpads, and the headphones are noted for being lightweight. It provides impressive vocal clarity in the midrange.
Best for vocal trackingBest for classical musicBest for rock
Pros
- Features a fuller and warmer bass response than the original HD 660S
- The sound is described as clear, crisp, and detailed without sounding overly analytical
- Provides excellent detail and separation, with vocals prominently featured
- Is noted for being comfortable for long listening sessions due to light weight and earpads
Cons
- Can have a rather tight clamping force out of the box
- May not be suitable for genres requiring extremely thunderous bass (e.g., EDM or rap)
Value for Money
Which is the better deal for the price
Pre-filled with launch prices where known — enter today's price for an up-to-date check. Use the same currency for both.
Sennheiser Momentum 4
Sennheiser HD 660S2
Physical Comparison
Weigh them up, then compare real dimensions in 3D
Sennheiser Momentum 4Sennheiser HD 660S2
Sennheiser Momentum 4 is 33 g (13%) heavier than Sennheiser HD 660S2.
Review Videos
Hand-picked expert reviews for each product
Detailed Specifications
The full spec sheet, side by side
Frequently Asked Questions
Common questions about Sennheiser Momentum 4 vs Sennheiser HD 660S2 comparison
Sennheiser Momentum 4 and Sennheiser HD 660S2 are compared side by side above across every spec in the headphones category — including performance, features and design — each scored 0–100 so you can see exactly where one leads the other. Our overall scores are 87/100 for Sennheiser Momentum 4 and 35/100 for Sennheiser HD 660S2.
At launch, Sennheiser Momentum 4 was the more affordable option ($379) versus Sennheiser HD 660S2 ($599). Weigh that against the overall scores (87/100 vs 35/100) and the value-for-money meter above to judge whether the higher-rated model justifies its price for your needs. Current retail prices vary — check the retailer.
If you want the higher-rated headphones option overall, Sennheiser Momentum 4 (87/100) edges out Sennheiser HD 660S2 (35/100). But if Sennheiser HD 660S2 is cheaper or stronger on the specific specs you care about, it can still be the better buy — use the spec table and strengths profile above to decide.