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 5 |
|---|---|---|
| Impedance | 16 Ω | 36 Ω |
| Sensitivity | 123 dB | 119 dB |
| Driver count | 1 | 3 |
Between the IE 900 and AONIC 5, the IE 900 comes out ahead in impedance / sensitivity, while the AONIC 5 wins on driver count. Overall, the IE 900 scores 66.4 and the AONIC 5 scores 66.4 on our Mars Score.
Which should you buy?
These two are evenly matched on the broad strokes; the decision sits on which individual spec advantages weigh more for your use.
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 — 20.00 Ω less. 16 vs 36.
Pick the AONIC 5 if you care most about driver count. Its strongest claims are driver count. The single most decisive one: Driver count — 2.00 more. 3 vs 1.
Both ship with comparable detachable cable, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Sennheiser - IE 900 or Shure - AONIC 5?
The two products are effectively tied on the current Mars Score.The more useful decision is the trade-off behind that result: compare driver count, 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 5 if…
Shure - AONIC 5 has the measurable edge on driver count.
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 — 20.00 Ω less. 16 vs 36.
- ▲Sensitivity — 3.36% more. 123 dB vs 119 dB.
Why Shure - AONIC 5 wins
- ▲Driver count — 2.00 more. 3 vs 1.
Spec comparison
Drivers
| Spec | Sennheiser - IE 900 | Shure - AONIC 5 |
|---|---|---|
| Driver count | 1 | 3lead |
| Driver types | Dynamic (X3R) | Triple Balanced Armature |
| Impedanceⓘ | 16 Ωlead | 36 Ω |
| Sensitivityⓘ | 123 dBlead | 119 dB |
Build
| Spec | Sennheiser - IE 900 | Shure - AONIC 5 |
|---|---|---|
| Detachable cable | true | true |
| Connector | MMCX | MMCX |