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Etymotic ER-4S microPro Earphones

Model: ER4S

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About: Etymotic ER-4S microPro Earphones

Etymotic invented noise-isolating, in-ear earphones. Etymotic's original insert earphone design, developed for auditory research and medical diagnostics, used balanced armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. The ER•4 MicroPro series earphones were the first earphones commercialized using this 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.

ER•4S earphones were designed to compensate for the high frequency emphasis in all CD recordings, in order to provide accurate sound reproduction. Performing musicians often use them as in-ear monitors because the response of the ER•4S matches the response of most typical monitor loudspeakers. The high accuracy and exceptional sound isolation of the ER•4S have made these earphones popular with musicians, recording engineers and audiophiles. ER•4S earphones can be used with a headphone amplifier when using low power portable devices.


  • World leader in sound reproduction
    • Unsurpassed frequency response accuracy and sound quality — 86%+ response accuracy from 20 Hz – 16 kHz
    • The only earphones with Accu•Driver™ 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 ACCU•Fit™ 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
    • Braid-reinforced cable for extremely low microphonic effect
    • ACCU•Filter™ user-replaceable filters protect the balanced-amature drivers from ear wax


  • Frequency Response: 20 Hz - 16 kHz
  • Accuracy Score: 4B (92%) 4S (92%) 4P (86%) 4PT (86%)
  • Transducers: balanced armature
  • Noise Isolation: 35-42 dB
  • Impedance (@1 kHz): 4B (100 Ohms) 4S (100 Ohms) 4P (27 Ohms) 4PT (27 Ohms)
  • Sensitivity (@1 kHz) SPL at 0.1V: 4B (90 dB) 4S (90 dB) 4P (102 dB) 4PT (102 dB)
  • Maximum Output (SPL): 122 dB
  • Cable: 5 ft
  • User Replaceable ACCU•Filters™
  • Warranty: 2 years

UPC: 898234000428 is a Canadian authorized Etymotic Research retailer.

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