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current earplug material was discovered in 1967, at national research in the usa by ross gardner and his team.
proizvodnjo čepov je začela nemška tovarna ohropax, leta 1907, pod vodstvom izumitelja max negwerja.
> 80 db(a)], as requested in ex,8h players of reeded woodwind and brass instruments generally cannot use compressible earplugs because the resulting occlusion effect amplifies the natural jaw resonance when they play (vocalists also find compressible earplugs make the voice sound strange).
igralci pihal z ustnikom in trobil običajno ne morejo uporabljati stisljivih ušesnih čepov, saj učinek zamašitve, ki nastane pri uporabi takih čepov, poveča naravno resonanco čeljusti med igranjem inštrumenta (vokalisti tudi ugotavljajo, da zvok zaradi stisljivih ušesnih čepov zveni nenavadno).
