Etymotic ER4SR Studio Reference EarphonesER4SR Studio Reference 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. Detachable 5 foot cable High performance balanced armature drivers Sleek driver bodies with anodized
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