Audio Store
coming soon
Shipping to:


You have no items in your shopping cart.

Etymotic ER4-B MicroPro Binaural In-Ear Earphone

More Views

Etymotic ER4-B MicroPro Binaural In-Ear Earphone

  • Braided cable for reduced microphonic effect

  • User replaceable filters protect drivers from ear wax and other debris

  • 3 models designed to meet your specific listening needs



In a Class by Itself

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.

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-armature drivers from ear wax



Technical Specifications

Additional Information

Package Contents
  • ER4 microPro earphones.
  • Assortment of eartips.
  • Filter removal tool and replacement filters.
  • Shirt Clip.
  • Carrying Case.
  • Exclusive channel-matching compliance graph signed by the Etymotic engineer who precision matched and custom tuned the balanced-armature drivers.
Warranty 2 years (local)
Availability Discontinued
Product Type Earphone
Style/Type Universal In-Ear
Driver Configuration 1-Driver (Balanced Armature)
Frequency Response (Hz) 20 Hz - 16 kHz
Impedance (Ω) 4B (100 Ohms) 4S (100 Ohms) 4PT (27 Ohms)
Sensitivity 4B (90 dB) 4S (90 dB) 4PT (102 dB)
Headphone Design Closed-Back
Microphone None
Cable Style Detachable (Customisable, IM, E/LS, others)
Input Connectivity 3.5mm stereo
User Reviews