Etymotic ER4-B MicroPro Binaural In-Ear Earphone

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