Etymotic Research ER4SR and ER4XR In-Ear Headphones Overview

Etymotic Research ER4SR and ER4XR In-Ear Headphones Overview
Etymotic Research ER4SR and ER4XR In-Ear Headphones Overview | Full Compass
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Part of the ER4® reference earphone series developed for auditory research and hearing testing by Etymotic Research, the ER4SR and ER4XR use balanced-armature receivers. Both models are designed and built with precision machined aluminum bodies, feature user-replaceable, detachable cables, and employ a stringent channel-matching standard.

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