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Sennheiser HD 660S — Open-back
Sennheiser

Sennheiser HD 660S

Open-back

90
/ 100
From $499
VS
Moondrop Blessing 3 — IEM
Moondrop

Moondrop Blessing 3

IEM

90
/ 100
From $320
Specdex verdict

Dead heat — it comes down to priorities.

In our weighted Specdex score, Sennheiser HD 660S lands at 90 and Moondrop Blessing 3 at 90. With scores tied, the decision hinges on which sub-scores matter most to you.

Pick Sennheiser HD 660S if…

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

Pick Moondrop Blessing 3 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

Tie

ANC strength for commute and travel

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

Comfort

Tie

Long-session wearability

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

Value for money

Moondrop Blessing 3

Specdex score per dollar at MSRP

Moondrop Blessing 3 more score per dollar ($320 vs $499).

Sennheiser HD 660S 90
vs
90 Moondrop Blessing 3

Score breakdown

Sennheiser HD 660S
90
anc 0
sound 90
comfort 88
battery 100
features 50
Moondrop Blessing 3
90
anc 0
sound 90
comfort 88
battery 100
features 50

Specs side-by-side

Sennheiser HD 660S versus Moondrop Blessing 3 — full spec comparison
Spec Sennheiser HD 660S Moondrop Blessing 3
Type
Open-back
IEM

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

Moondrop Blessing 3

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: Sennheiser HD 660S vs Moondrop Blessing 3

Which is better, Sennheiser HD 660S or Moondrop Blessing 3? +

Both score 90 on our weighted rubric — tied. 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 Moondrop Blessing 3 worth the price? +

At $320, Moondrop Blessing 3 delivers a Specdex score of 90 — strongest in battery.

Does Sennheiser HD 660S or Moondrop Blessing 3 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 the better value, Sennheiser HD 660S or Moondrop Blessing 3? +

Moondrop Blessing 3 — more score per dollar ($320 vs $499). Specdex score per dollar at MSRP.