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Etymotic ER4® Earphones

In a Class by Itself

Etymotic invented noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first earphones commercialised using balanced armature 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.


Backed by decades of research and development for the ear

World leader in sound reproduction

Unsurpassed frequency response accuracy and sound quality — 92%+ response accuracy from 20 Hz – 16 kHz

The only earphones with 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 ear tip 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

User-replaceable filters protect the balanced-armature drivers from ear wax

What’s In the Box?



Detachable, 5 ft. cord with 3.5mm gold plated stereo plug

¼” stereo phone adaptor

Assortment of ear tips

Filter removal tool and replacement filters

Shirt clip

Zippered storage case

Performance certificate  



Technical Specs

Frequency Response20 Hz - 16 kHz

TransducersHigh performance, balanced armature micro-drivers

Noise Isolation35-42 dB

Impedance (@1kHz)4XR (45 Ohms) 4SR (45 Ohms)

Sensitivity (@1 kHz) SPL at 0.1v4XR (98 dB) 4SR (98 dB)

Maximum Output (SPL)122 dB

Cable5 ft Detachable

User Replaceable ACCU-FiltersYes

Warranty2 Years

Custom-Fit OptionYes


Accurate Earphone Reproduction

For earphones to have 100% accuracy, a recording of a live performance must produce exactly the same sound at the eardrum as the original performance. To achieve this, the acoustic properties of the ear must be factored in. The acoustic resonance and horn effects of the ear change a flat audio signal entering the open ear into sound with a (2700 Hz) high-frequency boost, which is the same response heard at the eardrum in a typical ear.


Which ER•4 is Right for You?

Frequently Asked Questions

Instructions For Use


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