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Title: Noise altering, not noise cancelling
Review: I tried using the headphones in the presence of machines that make a continuous backgroung humming noise. The noise level and character was similar to what you experience in an airplane. The headphones diminished the noise somewhat, but very little. It also creates its own (annoying to me) white noise and the sound quality was significantly poorer than that of a $10 pair of sony earbud headphones. In my opinion these Philips "noise cancelling" headphones are little more than a gimmick.
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