Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Sennheiser - IE 900 | Shure - AONIC 3 |
|---|---|---|
| Impedance | 16 Ω | 30 Ω |
| Sensitivity | 123 dB | 113 dB |
Between the IE 900 and AONIC 3, the IE 900 comes out ahead in impedance / sensitivity, while the AONIC 3 wins on several specs. Overall, the IE 900 scores 66.4 and the AONIC 3 scores 56.6 on our Mars Score.
Which should you buy?
The IE 900 is the clear pick on raw spec strength, leading by 9.8 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 IE 900 if you care most about impedance / sensitivity. The biggest gaps in its favor are impedance, sensitivity. The single most decisive one: Impedance — 14.00 Ω less. 16 vs 30.
The AONIC 3 similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable driver count, detachable cable, so those specs do not separate the two — focus on the differences below.
Bottom line: the IE 900 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Sennheiser - IE 900 or Shure - AONIC 3?
Sennheiser - IE 900 leads the current Mars Score by 9.8 points.The more useful decision is the trade-off behind that result: compare impedance, sensitivity against the way you will actually use the product.
Choose Sennheiser - IE 900 if…
Sennheiser - IE 900 has the measurable edge on impedance ohm, sensitivity db.
Choose Shure - AONIC 3 if…
Shure - AONIC 3 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Sennheiser - IE 900 wins
- ▲Impedance — 14.00 Ω less. 16 vs 30.
- ▲Sensitivity — 8.85% more. 123 dB vs 113 dB.
Why Shure - AONIC 3 wins
- No decisive advantages.
Spec comparison
Drivers
| Spec | Sennheiser - IE 900 | Shure - AONIC 3 |
|---|---|---|
| Driver count | 1 | 1 |
| Driver types | Dynamic (X3R) | Single Balanced Armature |
| Impedanceⓘ | 16 Ωlead | 30 Ω |
| Sensitivityⓘ | 123 dBlead | 113 dB |
Build
| Spec | Sennheiser - IE 900 | Shure - AONIC 3 |
|---|---|---|
| Detachable cable | true | true |
| Connector | MMCX | MMCX |