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How to choose in-ear monitors in 2026

Wired in-ear monitors (IEMs) are a separate world from wireless earbuds. The Mars Score weights drivers (70%) and build (30%) because audio quality dominates the buying decision — IEM buyers care about driver topology, impedance matching and cable replaceability in ways that wireless buyers do not.

Driver count and types

Single dynamic driver IEMs like the Sennheiser IE 200 and IE 600 deliver coherent timbre and natural bass. Multi-balanced-armature designs like the Shure AONIC 5 and 64 Audio U12t split the frequency spectrum across specialised drivers. Hybrid designs combine both. Filter by driver_count and driver_types to narrow the field.

Impedance and sensitivity

Low-impedance, high-sensitivity IEMs work straight from a phone. Higher-impedance designs need a dedicated DAC/amp to reach their potential. Match impedance_ohm and sensitivity_db to your source.

Detachable cables and connectors

cable_detachable is the spec that decides whether the IEMs last 18 months or 5 years. MMCX and 0.78mm 2-pin connectors are the dominant standards; both let you swap stock cables for balanced 4.4 mm or Bluetooth adapter cables. See glossary for connector terminology.

Fit, isolation and tips

IEM ear tips affect bass response and isolation more than most spec sheets admit. Most premium IEMs ship 3–5 silicone tip sizes plus foam options. Custom-molded tips from third-party services are the next step up.

Source chain

The Campfire Audio Andromeda MW10 and similar TOTL IEMs reveal differences between DAPs and dongle DACs that cheaper IEMs hide. See Mars Labs for source-chain comparisons.

How vsMars scores in-ear monitors

Mars Score for IEMs weights drivers heavily because driver topology and tuning are what audiophiles actually buy. See methodology for the full formula.