ER3C earphones are the next generation of insert earphones, replacing ER•3A earphones, which have been the worldwide standard for audiometric insert earphones since 1985.
The frequency response and performance characteristics of ER•3C earphones are virtually identical to the original ER•3A earphones at all audiometric frequencies.
Features
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