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Etymotic Research Inc ER4S
microPro Earphones with Balanced Armature Drivers


Etymotic Research's ER4S were designed to compensate for the high frequency emphasis in all CD recordings, in order to provide accurate sound reproduction.
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Our Price: $299.00

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Etymotic Research Inc ER4S
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Etymotic Research's ER4S 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 ER4S matches the response of most typical monitor loudspeakers. The high accuracy and exceptional sound isolation of the ER4S have made these earphones popular with musicians, recording engineers and audiophiles. ER4S earphones can be used with a headphone amplifier when using low power portable devices.

World leader in sound reproduction      

  • Unsurpassed frequency response accuracy and soundquality — 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™ eartipoptions to ensure proper seal and comfort
  • CUSTOM-FIT option available (see note at end of specifications)

Highest noise isolation

  • First earphones to completely seal the ear
  • 98% (35 dB - 42 dB) noise isolation —highest of anyearphones 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 microphoniceffect
  • ACCU•Filter™ user-replaceable filters protect the balanced-amature driversfrom ear wax

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
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.

Please call Full Compass for more information on this option.   It requires a brief registration process, and a visit with an authorized audiologist to have ear impressions made.  The approximate cost of this option is $100 (excludes shipping, handling, and taxes)

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