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Sonos Ace — TV Audio Swap · Dolby Atmos · Wireless Home Theater
Sonos

Sonos Ace

TV Audio Swap · Dolby Atmos · Wireless Home Theater

87
/ 100
From $449
VS
Sennheiser HD 660S wins by 3
Sennheiser HD 660S — Open-back
Sennheiser

Sennheiser HD 660S

Open-back

90
/ 100
From $499
Specdex verdict

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

In our weighted Specdex score, Sonos Ace lands at 87 and Sennheiser HD 660S at 90. That puts Sennheiser HD 660S ahead by 3 points — a narrow margin driven mostly by its strengths in the categories below.

Pick Sonos Ace if…

  • ✓Unique TV Audio Swap with Arc soundbar
  • ✓Great ANC
  • ✓Spatial audio

Pick Sennheiser HD 660S if…

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

Sonos Ace

ANC strength for commute and travel

Sonos Ace leads on anc (90 vs 0).

Comfort

Tie

Long-session wearability

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

Value for money

Tie

Specdex score per dollar at MSRP

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

Sonos Ace 87
vs
90 Sennheiser HD 660S

Score breakdown

Sonos Ace
87
anc 90
sound 90
comfort 88
battery 84
features 92
Sennheiser HD 660S
90
anc 0
sound 90
comfort 88
battery 100
features 50

Specs side-by-side

Sonos Ace versus Sennheiser HD 660S — full spec comparison
Spec Sonos Ace Sennheiser HD 660S
Driver
40 mm dynamic
—
Battery
30 h
—
Weight
312 g
—
Codecs
aptX Lossless via Snapdragon Sound
—
Type
—
Open-back

Sonos Ace

Pros
  • +Unique TV Audio Swap with Arc soundbar
  • +Great ANC
  • +Spatial audio
Cons
  • −Swap feature only works with Arc/Arc Ultra
  • −Sonos app issues
  • −Heavy

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

FAQ: Sonos Ace vs Sennheiser HD 660S

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

Sennheiser HD 660S scores 90 on our weighted rubric — ahead by 3. Your best pick depends on the sub-scores above.

Is Sonos Ace worth the price? +

At $449, Sonos Ace delivers a Specdex score of 87 — strongest in features.

Is Sennheiser HD 660S worth the price? +

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

Does Sonos Ace or Sennheiser HD 660S 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, Sonos Ace or Sennheiser HD 660S? +

Sonos Ace — leads on anc (90 vs 0). ANC strength for commute and travel.