Sony IER-M9 IEMsearch



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5 BA Drivers, Carbon Fiber Plate

A high-end IEM for music enjoyment and monitoring alike, the Sony IER-M9 is built with the company’s proprietary Penta five-driver system, which includes a magnesium-diaphragm super tweeter and optimized signal paths. The T-shaped balanced armature directly drives the diaphragm for a more linear motion and clean, faithful highs. Of course, the IEM has an upscale look to match, with a light, durable magnesium alloy housing and a carbon fiber plate. Designed to stay firmly in place with a snug fit for all ear sizes, it comes with a variety of ear tips, a carrying case, and other accessories. 

The Reviews Are In

Head-Fi user Kygreying says, "The IER-M9 is an incredibly technically proficient IEM that does very little wrong, beating out many of the competition at this price point (including CIEMs). It is presented in a very professional packaging, and the sound is excellent. It handles almost all genres with ease, aided by solid performances across the board, with fast and quick response, stellar imaging, and plenty of details.” 


  • Sony
  • Proprietary Penta balanced-armature drivers x 5
  • Magnesium-diaphragm super tweeter
  • Magnesium alloy housing with carbon fiber plate
  • Preformed ear hanger for stable fit
  • Frequency response: 5 Hz–40 kHz
  • Sensitivity: 103 dB/mW
  • Impedance: 20 ohms at 1 kHz
  • 3.94 ft (1.2 m) silver-coated OFC cable
  • L-shaped, gold-plated, standard balanced plug
  • Weight: 0.39 oz (11 g)


  • 6 pairs of Triple Comfort ear tips (SS, M, MS, M, ML, L)
  • 6 pairs of hybrid silicone ear tips (SS, M, MS, M, ML, L)
  • Carrying case
  • Cable holder
  • Cleaning cloth
  • Shirt clip


All orders will be shipped by Massdrop.

Estimated ship date is Feb 18, 2019 PT.

After the drop ends, payment will be collected and the group’s order will be submitted to the vendor up front, making all sales final. Check the discussion page for updates on your order.