64 Audio U12t
IEM
Sennheiser HD 660S2
Over-ear · 2023
64 Audio U12t takes it — here’s why.
In our weighted Specdex score, 64 Audio U12t lands at 95 and Sennheiser HD 660S2 at 92. That puts 64 Audio U12t ahead by 3 points — a narrow margin driven mostly by its strengths in the categories below.
Pick 64 Audio U12t if…
- ✓Reference-level detail
- ✓Well-regarded in audiophile community
- ✓Long-term ownership appeal
Pick Sennheiser HD 660S2 if…
- ✓Flagship comfort + ANC on modern models
- ✓Premium build
- ✓Active noise cancellation (most models)
Winner by scenario
Derived from the sub-score breakdown · not a separate testSound quality
64 Audio U12tTuning, detail, and staging
64 Audio U12t leads on sound (95 vs 92).
Noise cancelling
Sennheiser HD 660S2ANC strength for commute and travel
Sennheiser HD 660S2 leads on anc (90 vs 0).
Comfort
Sennheiser HD 660S2Long-session wearability
Sennheiser HD 660S2 leads on comfort (91 vs 88).
Value for money
Sennheiser HD 660S2Specdex score per dollar at MSRP
Sennheiser HD 660S2 more score per dollar ($599 vs $1,999).
Score breakdown
Specs side-by-side
| Spec | 64 Audio U12t | Sennheiser HD 660S2 |
|---|---|---|
| Type | IEM | Over-ear |
| Release year | — | 2023 |
64 Audio U12t
- +Reference-level detail
- +Well-regarded in audiophile community
- +Long-term ownership appeal
- −Requires amplifier (most)
- −No active noise cancellation
- −Impractical for commuting
Sennheiser HD 660S2
- +Flagship comfort + ANC on modern models
- +Premium build
- +Active noise cancellation (most models)
- −Battery varies by codec
- −Some are Bluetooth-only
- −Price creep vs previous gen
FAQ: 64 Audio U12t vs Sennheiser HD 660S2
Which is better, 64 Audio U12t or Sennheiser HD 660S2? +
64 Audio U12t scores 95 on our weighted rubric — ahead by 3. Your best pick depends on the sub-scores above.
Is 64 Audio U12t worth the price? +
At $1,999, 64 Audio U12t delivers a Specdex score of 95 — strongest in battery.
Is Sennheiser HD 660S2 worth the price? +
At $599, Sennheiser HD 660S2 delivers a Specdex score of 92 — strongest in sound.
Does 64 Audio U12t or Sennheiser HD 660S2 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, 64 Audio U12t or Sennheiser HD 660S2? +
64 Audio U12t — leads on sound (95 vs 92). Tuning, detail, and staging.
Which is better for noise cancelling, 64 Audio U12t or Sennheiser HD 660S2? +
Sennheiser HD 660S2 — leads on anc (90 vs 0). ANC strength for commute and travel.