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Etymotic ER-3C Insert Earphones
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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 (internatural 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-Coupler-Difference) measurements
- May be calibrated in a 2-cc coupler, occluded ear simulator, or 0.4-cc coupler
