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Sennheiser HD 660S · Navy Blue — Open-back
Sennheiser

Sennheiser HD 660S · Navy Blue

Open-back

90
/ 100
From $499
VS
Bose QuietComfort Ultra wins by 3
Bose QuietComfort Ultra — CustomTune ANC · Immersive Audio · aptX Adaptive
Bose

Bose QuietComfort Ultra

CustomTune ANC · Immersive Audio · aptX Adaptive

93
/ 100
From $429
Specdex verdict

Bose QuietComfort Ultra takes it — here’s why.

In our weighted Specdex score, Sennheiser HD 660S · Navy Blue lands at 90 and Bose QuietComfort Ultra at 93. That puts Bose QuietComfort Ultra ahead by 3 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Sennheiser HD 660S · Navy Blue if…

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

Pick Bose QuietComfort Ultra if…

  • ✓Best comfort in class
  • ✓Excellent ANC
  • ✓Immersive Audio spatial feature
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Winner by scenario

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

Sound quality

Bose QuietComfort Ultra

Tuning, detail, and staging

Bose QuietComfort Ultra leads on sound (92 vs 90).

Noise cancelling

Bose QuietComfort Ultra

ANC strength for commute and travel

Bose QuietComfort Ultra leads on anc (96 vs 0).

Comfort

Bose QuietComfort Ultra

Long-session wearability

Bose QuietComfort Ultra leads on comfort (98 vs 88).

Value for money

Bose QuietComfort Ultra

Specdex score per dollar at MSRP

Bose QuietComfort Ultra more score per dollar ($429 vs $499).

Sennheiser HD 660S · Navy Blue 90
vs
93 Bose QuietComfort Ultra

Score breakdown

Sennheiser HD 660S · Navy Blue
90
anc 0
sound 90
comfort 88
battery 100
features 50
Bose QuietComfort Ultra
93
anc 96
sound 92
comfort 98
battery 86
features 90

Specs side-by-side

Sennheiser HD 660S · Navy Blue versus Bose QuietComfort Ultra — full spec comparison
Spec Sennheiser HD 660S · Navy Blue Bose QuietComfort Ultra
Type
Open-back
—
Driver
—
35 mm dynamic
Battery
—
24 h (Immersive Audio off) / 18 h (on)
Weight
—
253 g
Codecs
—
SBC, AAC, aptX Adaptive

Sennheiser HD 660S · Navy Blue

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

Bose QuietComfort Ultra

Pros
  • +Best comfort in class
  • +Excellent ANC
  • +Immersive Audio spatial feature
Cons
  • −Bose app fiddly
  • −No USB-C audio (3.5 mm + Bluetooth only)
  • −No LDAC support

FAQ: Sennheiser HD 660S · Navy Blue vs Bose QuietComfort Ultra

Which is better, Sennheiser HD 660S · Navy Blue or Bose QuietComfort Ultra? +

Bose QuietComfort Ultra scores 93 on our weighted rubric — ahead by 3. Your best pick depends on the sub-scores above.

Is Sennheiser HD 660S · Navy Blue worth the price? +

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

Is Bose QuietComfort Ultra worth the price? +

At $429, Bose QuietComfort Ultra delivers a Specdex score of 93 — strongest in comfort.

Does Sennheiser HD 660S · Navy Blue or Bose QuietComfort Ultra 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 · Navy Blue or Bose QuietComfort Ultra? +

Bose QuietComfort Ultra — leads on sound (92 vs 90). Tuning, detail, and staging.

Which is better for noise cancelling, Sennheiser HD 660S · Navy Blue or Bose QuietComfort Ultra? +

Bose QuietComfort Ultra — leads on anc (96 vs 0). ANC strength for commute and travel.