Sony IER-M9 In-ear Monitor Headphones

Key Features:
  • 5 driver reference monitor
  • Detailed, rich audio
  • Durable and comfortable mag-alloy earpiece
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The Sony IER-M9 is a flagship professional stage monitor earphone that delivers flat, accurate sound for musicians and music lovers alike. The durable magnesium alloy earpieces of the M9 are designed for an ergonomic and stable fit, while the detachable cable uses a silk-braided insulator to reduce microphonics and cable noise. 13 different ear tip variations are included so that you can find a perfect fit. This means that whether you are on stage or on the street, the IER-M9 will deliver hours of comfortable listening. A standard 3.5mm stereo cable is included, as well as a 4.4mm balanced cable for maximum performance with premium audio players like the Sony WM1AM2.

The IER-M9 features 5 balanced armature drivers house internally in a magnesium alloy bracket to suppress unwanted resonances. The result is a clean, fast and accurate sound well suited for critical listening. The M9 has a balanced sound, with rich low-midrange. Compared to the IER-M7 the M9 incorporates a magnesium diaphragm super-tweeter to deliver extended high frequency response and detail. The result is exceptional layering and detail across the frequency range.


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What's in the box

  • Triple Comfort ear buds:SS,S,MS,M, ML,L
  • Hybrid Silicone ear buds:SS,S,MS,M,ML,L,LL
  • 3.5mm MMCX Cable
  • 4.4 Balanced MMCX Cable
  • Carrying case
  • Cable holder
  • Cleaning cloth
  • Clip


Weight Approx. 9.0g (without cable)
Driver Unit Quad balanced armature
Impedance (Ohm) 20 ohms (at 1 kHz)
Frequency Response 5 Hz to 40,000 Hz
Sensitivities (dB/mW) 103 dB/mW
Cord Type Y-type
Cord Length
  • Approx. 1.2m, silver-coated OFC strands, ear hanger, L-shaped gold-plated 3.5mm stereo mini plug
  • Approx. 1.2m, silver-coated OFC strands, ear hanger, L-shaped gold-plated 4.4mm balanced standard plug

Audio Performance

Drivers5 Drivers
Sound Signature
Rich and detailed reference sound


Low Mid

Mid High


Resolution (8)

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In 1946, Tokyo Tsushin Kogyo K.K. (Tokyo Telecommunications Engineering Corporation, the predecessor of Sony Group Corporation) started as a small company. From the outset the company has release countless pioneering products, starting with Sony's introduction of Japan's first portable transistor radio in 1955. Sony has introduced various professional audio equipment such as microphones, DATs, MTRs, and effectors, garnering the trust of numerous musicians and engineers as a manufacturer with a distinct presence in the music industry.

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