Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Sennheiser - IE 200 | Sennheiser - IE 900 |
|---|---|---|
| Sensitivity | 119 dB | 123 dB |
| Impedance | 18 Ω | 16 Ω |
Between the IE 200 and IE 900, the IE 200 comes out ahead in several specs, while the IE 900 wins on sensitivity / impedance. Overall, the IE 200 scores 62.5 and the IE 900 scores 66.4 on our Mars Score.
Which should you buy?
The IE 900 edges ahead on the Mars Score (62.5 vs 66.4), but the 3.9-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The IE 200 does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the IE 900 if you care most about sensitivity / impedance. Its strongest claims are sensitivity, impedance. The single most decisive one: Sensitivity — 3.36% more. 123 dB vs 119 dB.
Both ship with comparable driver count, 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 200 or Sennheiser - IE 900?
Sennheiser - IE 900 leads the current Mars Score by 3.9 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 200 if…
Sennheiser - IE 200 does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Sennheiser - IE 900 if…
Sennheiser - IE 900 has the measurable edge on sensitivity db, impedance ohm.
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 200 wins
- No decisive advantages.
Why Sennheiser - IE 900 wins
- ▲Sensitivity — 3.36% more. 123 dB vs 119 dB.
- ▲Impedance — 2.00 Ω less. 16 vs 18.
Spec comparison
Drivers
| Spec | Sennheiser - IE 200 | Sennheiser - IE 900 |
|---|---|---|
| Driver count | 1 | 1 |
| Driver types | Dynamic | Dynamic (X3R) |
| Impedanceⓘ | 18 Ω | 16 Ωlead |
| Sensitivityⓘ | 119 dB | 123 dBlead |
Build
| Spec | Sennheiser - IE 200 | Sennheiser - IE 900 |
|---|---|---|
| Detachable cable | true | true |
| Connector | MMCX | MMCX |