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| Noise cancelling in-ear devices or headphones impact a narrow frequency range, and offer little actual hearing protection. You will have the illusion of hearing protection, however, and if you're using the device for communication or listening to music, it will exclude perceived sound, making it easier to hear. It doesn't mean you're being protected from ambient noise.
I use an expensive Bose aviation headset in the cockpit, not because it protects my hearing, but because it enables me to better understand foreign communications. I don't hear two sounds well, at the same time, so someone talking, especially with a foreign accent, is often hard for me to understand. Active noise reduction helps that, and enables me to focus on the voice and exclude some of the perceived background noise. I have to wear one earpiece in, the other out, to communicate with the guy sitting next to me, and others on the flight deck...so one ear is always exposed to the noise. Its' the same if I wear an over-the-ear headset; one ear cup is cocked behind the ear, the other over the ear.
The best hearing protection you can get for in-ear will be foam ear plugs. The best hearing protection you can get is over the ear; the ear cups reduce sound waves impacting the bone around the ear (which transmits sound to the inner ear), as well as reducing the level at the ear canal. Better yet is a foam in-ear plug with over-the-ear protection in addition.
Active noise reduction is used in some headsets with either a passive state until a decibel threshold is reached (gunshot, for example), or audio enhancement (mic/speaker) to enable hearing until a loud noise. Handy for hearing range commands, or an instructor, etc. Not nearly the protection that most wearers think.
If there's any loss of seal with any kind of active noise reduction, the effect on the ANR is substantial, and any element of noise protection is significantly reduced. It's important to understand the difference between what you perceive as reduced noise as the wearer of the device, and the level of protection that the device offers; the two are very different. The perception of reduced noise may encourage you to expose yourself to sound that can damage hearing, while you feel protected. It's insidious.
Active noise reduction can reduce fatigue, especially over long periods. Just be aware of is limitations. |