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Sennheiser HD 660S — Open-back
Sennheiser

Sennheiser HD 660S

Open-back

90
/ 100
From $499
VS
Sennheiser HD 660S wins by 3
Sonos Ace · Navy Blue — Over-ear · 2024
Sonos

Sonos Ace · Navy Blue

Over-ear · 2024

87
/ 100
From $449
Specdex verdict

Sennheiser HD 660S takes it — here’s why.

In our weighted Specdex score, Sennheiser HD 660S lands at 90 and Sonos Ace · Navy Blue at 87. That puts Sennheiser HD 660S ahead by 3 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 Sonos Ace · 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

Sennheiser HD 660S

Tuning, detail, and staging

Sennheiser HD 660S leads on sound (90 vs 87).

Noise cancelling

Sonos Ace · Navy Blue

ANC strength for commute and travel

Sonos Ace · Navy Blue leads on anc (85 vs 0).

Comfort

Sennheiser HD 660S

Long-session wearability

Sennheiser HD 660S leads on comfort (88 vs 86).

Value for money

Tie

Specdex score per dollar at MSRP

Effectively tied — similar score-per-dollar at MSRP.

Sennheiser HD 660S 90
vs
87 Sonos Ace · Navy Blue

Score breakdown

Sennheiser HD 660S
90
anc 0
sound 90
comfort 88
battery 100
features 50
Sonos Ace · Navy Blue
87
anc 85
sound 87
comfort 86
battery 82
features 83

Specs side-by-side

Sennheiser HD 660S versus Sonos Ace · Navy Blue — full spec comparison
Spec Sennheiser HD 660S Sonos Ace · Navy Blue
Type
Open-back
Over-ear
Release year
—
2024

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

Sonos Ace · 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 Sonos Ace · Navy Blue

Which is better, Sennheiser HD 660S or Sonos Ace · Navy Blue? +

Sennheiser HD 660S scores 90 on our weighted rubric — ahead by 3. 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 Sonos Ace · Navy Blue worth the price? +

At $449, Sonos Ace · Navy Blue delivers a Specdex score of 87 — strongest in sound.

Does Sennheiser HD 660S or Sonos Ace · 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 sound quality, Sennheiser HD 660S or Sonos Ace · Navy Blue? +

Sennheiser HD 660S — leads on sound (90 vs 87). Tuning, detail, and staging.

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

Sonos Ace · Navy Blue — leads on anc (85 vs 0). ANC strength for commute and travel.