ER4® SR Studio Reference Earphones, Etymotic

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. Why Etymotic? Etymotic designs products to measure, improve and protect hearing, and enhance the listening experience of music lovers everywhere. Audio engineers, musicians and audiologists at Etymotic have generated over 100 patents issued and pending. Why ER4SR Studio Reference? ER4SR is Etymotic's new reference standard hi-fidelity earphone for those who demand nothing less than the highest fidelity. The next generation of our long-revered flagship earphone, the ER4S, the ER4SR delivers