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2. Are Noise-Canceling Headphones Harmful to Your Ears? - AOL

   www.aol.com/noise-canceling-headphones-harmful...

   Noise cancellation works by creating an "anti-noise" wave 180 degrees out of phase with the original soundwave. This anti-noise wave cancels specific sound frequencies, nullifying this sound ...

3. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise cancellation to eliminate ambient noise is never passive because of the circuitry required, so references to passive noise cancellation actually are referring to products featuring sound isolation. To prevent higher-frequency noise from reaching the ear, most noise-cancelling headphones depend on sound isolation or soundproofing.

4. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   The wavelength in air of sinusoidal noise at approximately 800 Hz is double the distance of the average person's left ear to the right ear; [1] such a noise coming directly from the front will be easily reduced by an active system but coming from the side will tend to cancel at one ear while being reinforced at the other, making the noise ...

5. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Hearing protection devices with accurate placement (an airtight seal) and/or accurate insertion (deep into the ear canal) will provide the most attenuation of noise. [1] There are many challenges to achieving the needed protection from the device, from barriers to adequate use, to issues related to comfort, convenience, lack of training, to ...

6. 9 Possible Reasons Your Ears Won’t Stop Ringing ... - AOL

   www.aol.com/9-possible-reasons-ears-won...

   A noisy workplace, excess ear wax, or certain meds can cause ringing in ears. Here, audiologists explain the reasons for tinnitus and what to do about it. 9 Possible Reasons Your Ears Won’t Stop ...

7. Why do my ears feel clogged? 5 Things you can do right now. - AOL

   www.aol.com/why-ears-feel-clogged-5-000000206.html

   For example, very curvy ear canals, narrow ear canals, or surgical ears are more prone to earwax buildup. When wax builds up, it causes muffled hearing, tinnitus, or aural fullness (plugged-up ...