Etymotic ER4XR-BT Extended Response Wireless In-Ear HeadphonesThe ER4XR BT Wireless In Ear Headphones from Etymotic Research are made to provide you with reference quality audio fidelity. They utilize balanced armature, precision matched, and custom tuned drivers. These in ear monitors also feature a high 122 dB SPL sensitivity, clear midrange and highs, natural bass, and the convenience of a wireless design. To ensure audio quality during wireless transmission, Etymotic equipped these headphones with a
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