Etymotic Research has released two updates to its classic ER-4® insert earphone, the new ER4SR™ Studio Reference earphone and ER4XR™ Extended Response model.
For more than two decades, the ER-4S has been the world’s most accurate high-fidelity, noise-isolating earphone. Because of this, and its 30-40 dB noise isolation, the ER-4S has remained largely unchanged until now. The new models meet three design goals: 1) to provide greater accuracy in sound reproduction in the ER4SR Studio Reference earphone, 2) to offer consumers a choice with the ER4XR Extended Response option that delivers a little more bass without sacrificing the overall quality of the listening experience, and 3) a durable cable that is user replaceable...
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