Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Hifiman - Svanar | Sony - IER-M9 |
|---|---|---|
| Impedance | 60 Ω | 18 Ω |
| Driver count | 1 | 5 |
| Sensitivity | 107 dB | 103 dB |
Between the Svanar and IER-M9, the Svanar comes out ahead in sensitivity, while the IER-M9 wins on impedance / driver count. Overall, the Svanar scores 50.3 and the IER-M9 scores 54.5 on our Mars Score.
Which should you buy?
The IER-M9 edges ahead on the Mars Score (50.3 vs 54.5), but the 4.2-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Svanar if you care most about sensitivity. The biggest gaps in its favor are sensitivity. The single most decisive one: Sensitivity — 3.88% more. 107 dB vs 103 dB.
Pick the IER-M9 if you care most about impedance / driver count. Its strongest claims are impedance, driver count. The single most decisive one: Impedance — 42.00 Ω less. 18 vs 60.
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: Hifiman - Svanar or Sony - IER-M9?
Sony - IER-M9 leads the current Mars Score by 4.2 points.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 Hifiman - Svanar if…
Hifiman - Svanar has the measurable edge on sensitivity db.
Choose Sony - IER-M9 if…
Sony - IER-M9 has the measurable edge on impedance ohm, 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 Hifiman - Svanar wins
- ▲Sensitivity — 3.88% more. 107 dB vs 103 dB.
Why Sony - IER-M9 wins
- ▲Impedance — 42.00 Ω less. 18 vs 60.
- ▲Driver count — 4.00 more. 5 vs 1.
Spec comparison
Drivers
| Spec | Hifiman - Svanar | Sony - IER-M9 |
|---|---|---|
| Driver count | 1 | 5lead |
| Driver types | Dynamic (Topology Diaphragm) | 5 Balanced Armature |
| Impedanceⓘ | 60 Ω | 18 Ωlead |
| Sensitivityⓘ | 107 dBlead | 103 dB |
Build
| Spec | Hifiman - Svanar | Sony - IER-M9 |
|---|---|---|
| Detachable cable | true | true |
| Connector | 0.78mm 2-pinlead | MMCX |