Who is the Sony - IER-M9 for?
Entry-tier in-ear monitor. Below 58 on the Mars Score means several weighted specs trail the category leaders by a wide margin.
Only consider this if there is a specific reason — price, brand loyalty, ecosystem fit. The best-of page shows what your money buys a tier up.
Mars Score is computed from 6 measured specs against the transparent formula for the in-ear monitors category. No editorial picks, no paid placement.
Sony - IER-M9: advantages & disadvantages
Measured against every in-ear monitors we track, here is where the Sony - IER-M9 gives ground.
No spec lands in the top quartile of the category normalization window. Strengths sit in untracked specs (build quality, ecosystem, etc.) rather than weighted axes.
- ▼Driver count: 5 — below the typical in-ear monitors.
- ▼Sensitivity: 103 dB — below the typical in-ear monitors.
Pros are specs scoring ≥75% of the category normalization range. Cons are ≤35%. Derived from the Mars Score formula — no hand-curated lists.
At a glance
- Driver count
- 5
- Impedance
- 18Ω
- Sensitivity
- 103dB
- Connector
- MMCX
All specifications
Drivers
- Driver count
- 5
- Driver types
- 5 Balanced Armature
- Sensitivity?
- 103 dB
Build
- Detachable cable
- true
- Connector
- MMCX
Latest from the lab
All lab reports →Popular comparisons featuring the Sony - IER-M9
The 8 closest matchups in the In-Ear Monitors category, sorted by Mars Score proximity — the fights most worth your time.
Frequently asked
What is the Mars Score for Sony - IER-M9?+
Sony - IER-M9 scores 54.5 on the transparent Mars Score formula for in-ear monitors, computed from its published specs against the category's weighted normalization.
What category does Sony - IER-M9 belong to?+
Sony - IER-M9 is a Sony in-ear monitor catalogued in the In-Ear Monitors category.
When was Sony - IER-M9 released?+
Sony - IER-M9 was released on 2018-09-13.
What is the driver count of Sony - IER-M9?+
Sony - IER-M9 has a driver count of 5.
What is the impedance of Sony - IER-M9?+
Sony - IER-M9 has a impedance of 18 Ω.
What is the sensitivity of Sony - IER-M9?+
Sony - IER-M9 has a sensitivity of 103 dB.
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