Over-Ear Headphones · owner-verdict comparison

Sennheiser HD 660S2 vs Momentum 4 Wireless: what real owners say

Real owners lean toward the Sennheiser HD 660S2: 61% of 231 owners recommend it, vs 45% of 469 for the Momentum 4 Wireless.

Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score

Sennheiser HD 660S2

61%of 231 owners recommend

61% recommend · 20% neutral · 19% don't

Owners praise

Lush, natural mids and vocals with classic Sennheiser timbre
Deeper, richer bass with much better sub-bass extension than the older 6x0
Excellent imaging and soundstage for gaming and movies

Owners complain about

Dark, veiled or muffled-sounding presentation
Loses the forward midrange magic of the cheaper 600/650

Full owner report →

Momentum 4 Wireless

45%of 469 owners recommend

45% recommend · 27% neutral · 28% don't

Owners praise

Sound quality is the headline strength, owners repeatedly call it the best-sounding wireless headphone in its price bracket, often preferring it over Sony WH-1000XM4/XM5, Bose QuietComfort, and even AirPods Max for clarity, bass, and soundstage
Battery life holds up for years of daily use with minimal degradation, charges fast, and the user-replaceable battery is praised as a rare feature at this price
Great value for the price, especially now that it's discounted since the Momentum 5 launched, described as unbeatable price-to-performance and a steal around $150-200

Owners complain about

ANC is consistently rated weaker than Sony (WH-1000XM3/4/5/6) and Bose competitors, usable for daily commuting but inadequate on planes for some owners
Build quality and durability complaints, the fabric headband covering comes loose or peels within months, glue fails after about a year, and units crack or break under normal use
Software/app bugs and Bluetooth connectivity issues, dropped connections, multipoint pairing problems, and headphones randomly turning on/off or losing pairing

Full owner report →

Which should you buy?

Get the Sennheiser HD 660S2 if

✓HD6x0 owners wanting more bass extension and treble sparkle
✓All-day listeners who want a warm, fatigue-free sound
✓Gaming, movie, and music all-rounder seekers
✓Metal, rock, and EDM fans wanting fuller low end

Skip it if

Those wanting a wide, expansive soundstage over intimate presentation
Purists chasing the classic 600/650 midrange, which feels recessed

Get the Momentum 4 Wireless if

✓Sound-quality-first listeners who'll trade top-tier ANC for richer, fuller audio
✓Frequent travelers who want multi-day battery life and decent (not best) noise cancellation
✓Remote workers on long calls who need all-day comfort and clear mic quality
✓Budget-conscious buyers wanting near-flagship sound without flagship pricing

Skip it if

Frequent flyers who need best-in-class ANC, since Sony and Bose noticeably outperform it
Gym-goers or heavy sweaters, since moisture repeatedly causes malfunctions and shorted circuits

What Sennheiser HD 660S2 owners say

“I've had it for 5 years now and I still consider it the best of the 600 series”
— @o.f.ftrack3444 on YouTube

“They are my go-to primary headphones.”
— @scottlowell493 on YouTube

“At $250-$350 I would consider giving these a go at $600 they are a pass.”
— @mindhead1 on YouTube

What Momentum 4 Wireless owners say

“Thats unfortunate. I've been using mine for about 2 and a half years daily, and the only problem I've had is the earpads deteriorated and I had to get replacements.”
— Randy265 on Reddit

“i bought M4 last year and i'm fully satisfied”
— zeldafr on Reddit

“Verdict: Not very good”
— thogor on Reddit

Sennheiser HD 660S2 vs Momentum 4 Wireless: frequently asked questions

Is the Sennheiser HD 660S2 or the Momentum 4 Wireless better?

Real owners lean toward the Sennheiser HD 660S2: 61% of 231 owners recommend it, vs 45% of 469 for the Momentum 4 Wireless.

Who should get the Sennheiser HD 660S2?

Owners point the Sennheiser HD 660S2 at hD6x0 owners wanting more bass extension and treble sparkle, and all-day listeners who want a warm, fatigue-free sound.

Who should get the Momentum 4 Wireless?

Owners point the Momentum 4 Wireless at sound-quality-first listeners who'll trade top-tier ANC for richer, fuller audio, and frequent travelers who want multi-day battery life and decent (not best) noise cancellation.

What do owners complain about?

The most-cited downside of the Sennheiser HD 660S2 is dark, veiled or muffled-sounding presentation. For the Momentum 4 Wireless, it's aNC is consistently rated weaker than Sony (WH-1000XM3/4/5/6) and Bose competitors, usable for daily commuting but inadequate on planes for some owners.