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Sennheiser HD 660S — Open-back
Sennheiser

Sennheiser HD 660S

Open-back

90
/ 100
From $499
VS
Sennheiser Momentum 4 · Navy Blue wins by 1
Sennheiser Momentum 4 · Navy Blue — Over-ear · 2022
Sennheiser

Sennheiser Momentum 4 · Navy Blue

Over-ear · 2022

91
/ 100
From $349
Specdex verdict

Sennheiser Momentum 4 · Navy Blue takes it — here’s why.

In our weighted Specdex score, Sennheiser HD 660S lands at 90 and Sennheiser Momentum 4 · Navy Blue at 91. That puts Sennheiser Momentum 4 · Navy Blue ahead by 1 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Sennheiser HD 660S if…

  • ✓Reference-level detail
  • ✓Well-regarded in audiophile community
  • ✓Long-term ownership appeal

Pick Sennheiser Momentum 4 · Navy Blue if…

  • ✓Flagship comfort + ANC on modern models
  • ✓Premium build
  • ✓Active noise cancellation (most models)
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Winner by scenario

Derived from the sub-score breakdown · not a separate test

Sound quality

Tie

Tuning, detail, and staging

Effectively tied — neither pulls a 2-point weighted lead.

Noise cancelling

Sennheiser Momentum 4 · Navy Blue

ANC strength for commute and travel

Sennheiser Momentum 4 · Navy Blue leads on anc (89 vs 0).

Comfort

Sennheiser Momentum 4 · Navy Blue

Long-session wearability

Sennheiser Momentum 4 · Navy Blue leads on comfort (90 vs 88).

Value for money

Sennheiser Momentum 4 · Navy Blue

Specdex score per dollar at MSRP

Sennheiser Momentum 4 · Navy Blue more score per dollar ($349 vs $499).

Sennheiser HD 660S 90
vs
91 Sennheiser Momentum 4 · Navy Blue

Score breakdown

Sennheiser HD 660S
90
anc 0
sound 90
comfort 88
battery 100
features 50
Sennheiser Momentum 4 · Navy Blue
91
anc 89
sound 91
comfort 90
battery 82
features 87

Specs side-by-side

Sennheiser HD 660S versus Sennheiser Momentum 4 · Navy Blue — full spec comparison
Spec Sennheiser HD 660S Sennheiser Momentum 4 · Navy Blue
Type
Open-back
Over-ear
Release year
—
2022

Sennheiser HD 660S

Pros
  • +Reference-level detail
  • +Well-regarded in audiophile community
  • +Long-term ownership appeal
Cons
  • −Requires amplifier (most)
  • −No active noise cancellation
  • −Impractical for commuting

Sennheiser Momentum 4 · Navy Blue

Pros
  • +Flagship comfort + ANC on modern models
  • +Premium build
  • +Active noise cancellation (most models)
Cons
  • −Battery varies by codec
  • −Some are Bluetooth-only
  • −Price creep vs previous gen

FAQ: Sennheiser HD 660S vs Sennheiser Momentum 4 · Navy Blue

Which is better, Sennheiser HD 660S or Sennheiser Momentum 4 · Navy Blue? +

Sennheiser Momentum 4 · Navy Blue scores 91 on our weighted rubric — ahead by 1. Your best pick depends on the sub-scores above.

Is Sennheiser HD 660S worth the price? +

At $499, Sennheiser HD 660S delivers a Specdex score of 90 — strongest in battery.

Is Sennheiser Momentum 4 · Navy Blue worth the price? +

At $349, Sennheiser Momentum 4 · Navy Blue delivers a Specdex score of 91 — strongest in sound.

Does Sennheiser HD 660S or Sennheiser Momentum 4 · Navy Blue last longer? +

Based on our long-term update and support ratings, both ship with multi-year support. Battery and reliability scores are visible in the breakdown above.

Which is better for noise cancelling, Sennheiser HD 660S or Sennheiser Momentum 4 · Navy Blue? +

Sennheiser Momentum 4 · Navy Blue — leads on anc (89 vs 0). ANC strength for commute and travel.

Which is better for comfort, Sennheiser HD 660S or Sennheiser Momentum 4 · Navy Blue? +

Sennheiser Momentum 4 · Navy Blue — leads on comfort (90 vs 88). Long-session wearability.