Between the IE 600 and IE 900, the IE 600 comes out ahead in several specs, while the IE 900 wins on sensitivity and impedance. Overall, the IE 600 scores 61.5 and the IE 900 scores 66.4 on our Mars Score.
Which should you buy?
The IE 900 edges ahead on the Mars Score (61.5 vs 66.4), but the 4.9-point gap is small enough that the right pick comes down to which spec advantages matter to you.
The IE 600 doesn't 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 and impedance. Its strongest claims are sensitivity, impedance.
Both ship with comparable driver count, detachable cable, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Sennheiser - IE 600 wins
- No decisive advantages.
Why Sennheiser - IE 900 wins
- ▲Sensitivity — 4.24% more. 123 dB vs 118 dB.
- ▲Impedance — 2.00 Ω less. 16 vs 18.
Spec comparison
Drivers
| Spec | Sennheiser - IE 600 | Sennheiser - IE 900 |
|---|---|---|
| Driver count | 1 | 1 |
| Driver types | Dynamic (TrueResponse) | Dynamic (X3R) |
| Impedanceⓘ | 18 Ω | 16 Ωlead |
| Sensitivityⓘ | 118 dB | 123 dBlead |
Build
| Spec | Sennheiser - IE 600 | Sennheiser - IE 900 |
|---|---|---|
| Detachable cable | true | true |
| Connector | MMCX | MMCX |
Spec-level deep dives
More from the same brands
vsMars is reader-supported. When you buy through links on our site, we may earn an affiliate commission at no extra cost to you. Learn more.