Between the AONIC 5 and IER-M9, the AONIC 5 comes out ahead in sensitivity, while the IER-M9 wins on impedance and driver count. Overall, the AONIC 5 scores 66.4 and the IER-M9 scores 54.5 on our Mars Score.
Which should you buy?
The AONIC 5 is the clear pick on raw spec strength, leading by 11.9 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 AONIC 5 if you care most about sensitivity. The biggest gaps in its favor are sensitivity.
Pick the IER-M9 if you care most about impedance and driver count. Its strongest claims are impedance, driver count.
Both ship with comparable detachable cable, so those specs don't separate the two — focus on the differences below.
Bottom line: the AONIC 5 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Shure - AONIC 5 wins
- ▲Sensitivity — 15.53% more. 119 dB vs 103 dB.
Why Sony - IER-M9 wins
- ▲Impedance — 18.00 Ω less. 18 vs 36.
- ▲Driver count — 2.00 more. 5 vs 3.
Spec comparison
Drivers
| Spec | Shure - AONIC 5 | Sony - IER-M9 |
|---|---|---|
| Driver count | 3 | 5lead |
| Driver types | Triple Balanced Armature | 5 Balanced Armature |
| Impedanceⓘ | 36 Ω | 18 Ωlead |
| Sensitivityⓘ | 119 dBlead | 103 dB |
Build
| Spec | Shure - AONIC 5 | Sony - IER-M9 |
|---|---|---|
| Detachable cable | true | true |
| Connector | MMCX | MMCX |
Spec-level deep dives
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