Incorporates “touch-proof” electrical connection for safety
Duplicates ER•3A smooth frequency response
Provides 30+ dB external noise exclusion – equivalent to a single-wall booth when used with deeply-sealed foam eartips
Provides 70+ dB isolation (interaural attenuation) between ears; reduces the need for masking
Reduces test/retest variability compared to supra-aural earphones
Eliminates test errors due to collapsed ear canals
Simplifies RECD (Real-Ear-to-Coupler-Difference) measurements
May be calibrated in a 2-cc coupler; occluded ear simulator; or 0.4-cc coupler
Uses E-A-RLink insert eartips

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Etymotic Research 3C Insert Earphones (50 Ohm)

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