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Etymotic Research ER4SR Studio Reference Earphones


  • Reference standard sound
  • High Accuracy
  • Noise Isolating
  • Metal body with anodized finish
  • Detachable Kevlar reinforced cables allow for easy replacement and customization

In stock

Etymotic invented noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first earphones commercialized using balanced armature  technology and are recognized as the world leader in response accuracy, to which all other earphones are compared. After more than 20 years, these reference-quality earphones are still the choice of serious sound engineers, audiophiles and musicians.

Backed by decades of research and development for the ear

World leader in sound reproduction

  • Unsurpassed frequency response accuracy and sound quality — 92%+ response accuracy from 20 Hz – 16 kHz
  • The only earphones with balanced-armature, precision-matched, custom-tuned drivers
  • Highest output sensitivity in its class

Timeless style and fit

  • Professional quality and reliability
  • An assortment of noise-isolating eartip options to ensure proper seal and comfort
  • CUSTOM•FIT option available

Highest noise isolation

  • First earphones to completely seal the ear
  • 98% (35 dB – 42 dB) noise isolation —highest of any earphones or headsets on the market today
  • Reduction of outside noise reduces the risk of listening at unsafe levels

Best durability and warranty

  • 2-year replacement warranty
  • User-replaceable filters protect the balanced-armature drivers from ear wax


  • Driver Type: Balanced Armature
  • Impedance @ 1kHz: 45 ohms
  • Sensitivity: 98 dB SPL/V
  • Frequency Response: 20Hz – 17kHz
  • Maximum Output: 122 dB
  • Isolation: -35 dB ~ -42 dB
  • Connector Type: 1/8″ (right angle plug)
  • Cable Length: 5 ft. (1.5 m)
  • Cable Style: Straight “Y” Type

What’s In the Box?

  • Earphones
  • Detachable, 5 ft. cord with 3.5mm gold plated stereo plug
  • ¼” stereo phone adaptor
  • Assortment of ear-tips
  • Filter removal tool and replacement filters
  • Shirt clip
  • Zippered storage case
  • Performance certificate

Fit Type




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