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  2. Missing fundamental - Wikipedia

    en.wikipedia.org/wiki/Missing_fundamental

    The missing fundamental phenomenon is used electronically by some pro audio manufacturers to allow sound systems to seem to produce notes that are lower in pitch than they are capable of reproducing. In a hardware effects unit or a software plugin, a crossover filter is set at a low frequency above which the sound system is capable of safely ...

  3. List of unexplained sounds - Wikipedia

    en.wikipedia.org/wiki/List_of_unexplained_sounds

    Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.

  4. Noise-induced hearing loss - Wikipedia

    en.wikipedia.org/wiki/Noise-induced_hearing_loss

    Otorhinolaryngology, audiology. Noise-induced hearing loss ( NIHL) is a hearing impairment resulting from exposure to loud sound. People may have a loss of perception of a narrow range of frequencies or impaired perception of sound including sensitivity to sound or ringing in the ears. [1] When exposure to hazards such as noise occur at work ...

  5. Fix problems reading or receiving AOL Mail - AOL Help

    help.aol.com/articles/fix-problems-reading-or...

    Make sure the option "Block All Senders Except Contacts" under "Mail Settings --> Block Senders" is unchecked. If checked, you will not receive messages from anyone not in your contacts. Messages are often delivered right way though very rarely there may be a delay in transit. This is usually due to problems on the mail server, heavy internet ...

  6. Why Do My Ears Itch? (And How to Make It Stop) - AOL

    www.aol.com/lifestyle/why-ears-itch-stop...

    Key Takeaways: Itchy ears are not uncommon when adjusting to hearing aids, as it takes time for the ear to adjust to the presence of a hearing aid. Other common causes of itchy ears includes ...

  7. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

    www.aol.com/entertainment/20-off-raycon-earbuds...

    These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...

  8. FYI, AirPods are the same price they were on Prime Day - AOL

    www.aol.com/lifestyle/fyi-airpods-are-the-same...

    Apple AirPods (2nd Generation) $80 $129 Save $49. This is an outrageous price for AirPods! In fact, it's a record-low price, so if you've been toying with a pair or need to replace your current ...

  9. Select and enable a New Mail notification in AOL Mail

    help.aol.com/articles/select-and-enable-a-new...

    1. Click the Settings icon | select More Settings. 2. Click Notifications. 3. Under "New Mail," select your notification option: • Play a sound when new mail arrives - Default sound.