for example, you’re in a loud train station or in a place with loud tools but you hardly hear anything with noise cancelation. why is this not considered hearing protection?
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Noise canceling headphones does have limits to what they can cancel out. The speakers and amplifiers in them have a maximum strength and the software and microphones have issues with some sounds. The noise canceling feature might even do some loud sounds worse. The background noise you hear when walking in public is usually low enough not to cause any sort of issues. The sounds which do cause damage to your hearing tends to overload the noise canceling features anyway.
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