Etymotic ER4SR Studio Reference In Ear Headphones


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Over 30 years ago, Etymotic invented noise-isolating, in-ear earphones. Etymotic’s original design, developed for auditory research and hearing testing, used balanced –armature receivers and established these speakers as the gold standard for high-definition, in-ear earphones. ER4 earphones were the first high-fidelity, noise isolating in-ear earphones to use this technology in a consumer earphone, and are recognized as the world leader for response accuracy to which all other earphones are compared.s.

  • In a Class by Itself
    Etymotic invented noise-isolating, in-ear earphones. The ER4 MicroPro series earphones were the first earphones commercialized 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.

  • 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 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
    • User-replaceable filters protect the balanced-armature drivers from ear wax
    • Frequency Response: 20 Hz - 16 kHz
    • Transducers: High performance, balanced armature micro-drivers
    • Noise Isolation: 35-42 dB
    • Impedance (@1kHz): 4XR (45 Ohms) 4SR (45 Ohms)
    • Sensitivity (@1 kHz) SPL at 0.1v: 4XR (98 dB) 4SR (98 dB)
    • Maximum Output (SPL): 122 dB
    • Cable: 5 ft Detachable
    • User Replaceable: ACCU-Filters Yes
    • Warranty: 2 Years
    • Custom-Fit Option: Yes