About this gear
The ER4XR is a reference-class IEM born from Etymotic's hearing research heritage, prioritizing linear accuracy and detail retrieval over colored tuning. Its balanced armature driver and proprietary fit system make it a studio and live-sound benchmark, favored by audio professionals and critical listeners who demand neutrality and honest tonal reproduction.
About Etymotic
American hearing research company founded in 1983 by Dr. Mead Killion in Elk Grove Village, Illinois. Etymotic literally means 'true to the ear' — their ER4 series defined the concept of reference IEM tuning, adhering to the diffuse-field target response with scientific precision. Known for deep-ins...
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