Between the U12t and IE 900, the U12t comes out ahead in driver count and impedance, while the IE 900 wins on sensitivity. Overall, the U12t scores 79.3 and the IE 900 scores 66.4 on our Mars Score.
Which should you buy?
The U12t is the clear pick on raw spec strength, leading by 12.9 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the U12t if you care most about driver count and impedance. The biggest gaps in its favor are driver count, impedance.
Pick the IE 900 if you care most about sensitivity. Its strongest claims are sensitivity.
Both ship with comparable detachable cable, so those specs don't separate the two — focus on the differences below.
Bottom line: the U12t is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why 64 Audio - U12t wins
- ▲Driver count — 11.00 more. 12 vs 1.
- ▲Impedance — 4.00 Ω less. 12 vs 16.
Why Sennheiser - IE 900 wins
- ▲Sensitivity — 6.96% more. 123 dB vs 115 dB.
Spec comparison
Drivers
| Spec | 64 Audio - U12t | Sennheiser - IE 900 |
|---|---|---|
| Driver count | 12lead | 1 |
| Driver types | 12 Balanced Armature | Dynamic (X3R) |
| Impedanceⓘ | 12 Ωlead | 16 Ω |
| Sensitivityⓘ | 115 dB | 123 dBlead |
Build
| Spec | 64 Audio - U12t | Sennheiser - IE 900 |
|---|---|---|
| Detachable cable | true | true |
| Connector | 2-pinlead | MMCX |
Spec-level deep dives
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