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I think you are asking if it increases the effectiveness of the QC20's if one wears a pair of passive over-the-ear muffs over them. The answer is an unequivocal yes-there is substantial additional effectiveness by using this strategy.
Sorry, there was a problem. Please try again later.I am not certain but my best guess is they will only mute that kind of noise, you will still be able to hear it somewhat.
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