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Impulse w/Toggle - This filter has a toggle on it which allows you to open or close the sound bore
INCREDIBLY PORTABLE
Specification
full impression every time
Etymotic ER-3C Insert Earphones Model:ER-3C 10 Ohm Impulse w/Toggle - This filterThe Etymotic ER 3C Earphones are basically updated and improved on the ER 3A inserts and have incorporated "touch proof" electrical connection for safety. They have a smooth frequency response and provide 30dB of isolation between ears, which reduces the need for masking. Compared to supra aural headphones, they reduce test retest variability and eliminate test errors due to collapsed ear canals. They may be calibrated in a 2 cc coupler, occluded ear
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