Etymotic Research ER-4PT Noise-Attenuating Earphones

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Product Description


Etymotic Research has their company motto right in the name. "Etymotic" (pronounced et-im-oh-tik) means "true to the ear." Founded in 1983 by Mead Killion, Ph.D., Etymotic's mission has been to design products that accurately assess hearing, and improve the lives of those that use their products. Hearing aids, as well as ear protection to prevent hearing loss are among the first products they produced.

In 1984, Etymotic Research invented insert earphones as we know them, and has continued to define what it means to be high fidelity as an IEM.

When first invented, noise-isolating, in-ear earphones were developed for auditory research and medical diagnostics. Etymotic used balanced armature receivers, establishing them as the authority over high fidelity IEMs. As the first series earphone commercially available using this technology, the ER-4PT 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.

Hands-on by GEDDEM


Additional Information

Additional Information

Product Specification
  • Type: In-Ear, Stereo, Balanced Armature
  • Frequency Range: 20 Hz - 16 kHz (86% Accuracy)
  • Impedance: 27 ohms
  • Sensitivity: 108 dB
  • SPL: 122 dB, Max
  • Maximum Input Power: 0.75 VRMS, Continuous
  • Isolation: 35-42 dB
  • Connectors: 3.5 mm Stereo Mini Plug
  • Cable Length: 5' (1.5 m)
  • Weight: 1 oz (28 g)
  • Highlights
  • ACCU·Driver Balanced Armatures
  • 98% Noise Isolation
  • Multiple Eartips
  • Braid-Reinforced Cable
  • Related Video



    Excellent!Review by E. Joshua
    Excellent sound quality. Extremely comfortable fit, especially with the black foam tips. If the price doesn't scare you away, these are VERY nice headphones.

    - Incredibly accurate sound - Detailed mids and highs
    - Tight bass - Great noise isolation
    - Ideal for portable use
    - Partially braided cable inhibits microphonics
    - Oodles of accessories included.

    - Thick plug may not fit on smartphones with cases

    To achieve the best sound quality, Etymotic and other IEM's require a proper seal inside your ear canal. A proper seal is *critical*, and achieving it can be a harrowing experience for some. It was for me at first, but I've grown used to them now. I can wear them for a few hours at a time with only a slight amount of discomfort. From my experience with other Etymotic earphones, I knew that the glider eartips would work best for me. I recommend new owners try every eartip included to find the best balance of seal and comfort.

    The overall build quality of the ER-4PT is outstanding. The 5-foot cable is thick and smooth--keeping the ER-4PT from becoming a tangled mess. The twist with the ER-4PT is that the top 12 inches or so are braided to help alleviate microphonics. Microphonics is the noise that is heard when the cable rubs or hits against an object. Nearly every IEM is susceptible to microphonics because IEM's rest inside your ear canal. Some companies have battled microphonics by designing the cable to be wrapped behind the ears. The way Etymotic designed the cable works fairly well but doesn't completely eliminate it. (Posted on 3/27/2014)

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