Sennheiser
Sennheiser HD 660S2
Over-ear · 2023
92
/ 100
From $599
VS
64 Audio U12t wins by 3
64 Audio
64 Audio U12t
IEM
95
/ 100
From $1,999
Specdex verdict
64 Audio U12t takes it — here’s why.
In our weighted Specdex score, Sennheiser HD 660S2 lands at 92 and 64 Audio U12t at 95. That puts 64 Audio U12t ahead by 3 points — a narrow margin driven mostly by its strengths in the categories below.
Pick Sennheiser HD 660S2 if…
- ✓Flagship comfort + ANC on modern models
- ✓Premium build
- ✓Active noise cancellation (most models)
Pick 64 Audio U12t if…
- ✓Reference-level detail
- ✓Well-regarded in audiophile community
- ✓Long-term ownership appeal
Sennheiser HD 660S2 92
vs 95 64 Audio U12t
Score breakdown
Sennheiser HD 660S2
92 anc 90
sound 92
comfort 91
battery 82
features 88
64 Audio U12t
95 anc 0
sound 95
comfort 88
battery 100
features 50
Specs side-by-side
| Spec | Sennheiser HD 660S2 | 64 Audio U12t |
|---|---|---|
| Type | Over-ear | IEM |
| Release year | 2023 | — |
Sennheiser HD 660S2
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
64 Audio U12t
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 660S2 vs 64 Audio U12t
Which is better, Sennheiser HD 660S2 or 64 Audio U12t? +
64 Audio U12t scores 95 on our weighted rubric — ahead by 3. Your best pick depends on the sub-scores above.
Is Sennheiser HD 660S2 worth the price? +
At $599, Sennheiser HD 660S2 delivers a Specdex score of 92 — strongest in sound.
Is 64 Audio U12t worth the price? +
At $1,999, 64 Audio U12t delivers a Specdex score of 95 — strongest in battery.
Does Sennheiser HD 660S2 or 64 Audio U12t 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.