Etymotic ER4XR Extended Response Studio Reference EarphonesER4XR Extended Response The World's Most Accurate Earphones Just Got Better! 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. 2 year warranty Braided cable for reduced microphonic effect User replaceable filters protect drivers
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Etymotic ER4XR Extended Response Studio Reference Earphones