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  1. tonyjeffs2

    Active vs Passive sound attenuation

    I'm intrigued by a quote website selling ear protection -earplugs. "Noise isolation (34-36 dB) far surpasses that of active noise-canceling earphones" http://www.etymotic.com/ephp/er6.aspx Surely that claim is impossible. At the very least it could be classed as misleading if they're...

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