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Etymotic Research Inc ER•4S
microPro Earphones with Balanced Armature Drivers


In order to provide accurate sound reproduction...
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Our Price: $299.00
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Etymotic Research Inc ER•4S
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In order to provide accurate sound reproduction, Etymotic Research's ER•4S earphones – part of their microPro® earphones lineup – were designed to compensate for the high frequency emphasis in all CD recordings. Because the response of the ER•4S matches the response of most typical monitor loudspeakers, performing musicians often use them as in-ear monitors, and due to their high degree of accuracy and excellent sound isolation, they're popular with musicians, recording engineers, and audiophiles. In addition, they can be used with a headphone amplifier when using low-power portable devices.

ER•4 MicroPro Series Earphones
Inventors of noise-isolating, in-ear earphones, Etymotic Research offers the ER•4 microPro line of earphones. They use balanced-armature receivers as found in their original insert earphone design, developed for auditory research and medical diagnostics. This series was the first commercialized earphone to employ this technology and is recognized as the world leader in response accuracy, the benchmark 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.

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 (see below)

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

Etymotic Research ER•4S Technical Specifications:

  • Frequency Response: 20 Hz - 16 kHz
  • Accuracy Score: 92%
  • Transducers: balanced armature
  • Noise Isolation: 35-42 dB
  • Impedance (@1 kHz): 100 Ohms
  • Sensitivity (@1 kHz) SPL at 0.1V: 90 dB
  • Maximum Output (SPL): 122 dB
  • Cable: 5 ft
  • User-replaceable ACCU-Filters™: Yes
  • Warranty: 2 years
  • CUSTOM•FIT Option: Available (see note below)

NOTE: Etymotic offers a cost-effective CUSTOM•FIT solution to make your favorite earphones the best they can be with superb comfort, secure fit, and consistent noise isolation. It requires a brief registration process and a visit with an authorized audiologist to have ear impressions made. Please contact your Full Compass Sales Pro for more information on this option.

Etymotic Research Inc ER38-18 Large Gray 3-Flange Replacement Eartips, 5 Pairs
Etymotic Research Inc ER38-18 Large Gray 3-Flange Replacement Eartips, 5 Pairs
Produced by Etymotic Research, the ER38-18 is a package of 10 (5 pairs) Gray Large 3-Flange Replacement Eartips that are designed for use with the following Etymotic products (all sold separately): ER•4 ER4SR ERXR  hf Series ...
12.75 14.00 9

In Stock
Etymotic Research Inc ER38-15SM 5-Pairs of Standard Frost 3-Flange Eartips
Etymotic Research Inc ER38-15SM 5-Pairs of Standard Frost 3-Flange Eartips
Etymotic Research's ER38-15SM is a Package of 10 Eartips (5 pair) that are designed for use with the following systems (sold separately): ER•4 MicroPro™  hf Series mc Series HD5™ Safety ETY•Kids® MP•9-15 ...
13.40 14.00

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