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  2. Megaphone - Wikipedia

    en.wikipedia.org/wiki/Megaphone

    Handheld versions are shaped generally like the old acoustic megaphone, with a microphone at one end and a horn speaker at the other, and a pistol grip on the side, with a trigger switch to turn it on. In use, the device is held up to the mouth, and the trigger is pressed to turn it on while speaking.

  3. Use this simple trick to make your phone speaker louder - AOL

    www.aol.com/news/2015-08-04-use-this-simple...

    The shape of the bowl will work as an amplifier and the sound coming out of your phone will be much louder than before. Step 3 - Enjoy your music now that you can hear it. More from AOL.com:

  4. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    Early public-address system from around 1920 using a Magnavox speaker. The microphone had a metal reflector that concentrated the sound waves, allowing the speaker to stand back so it would not obscure his or her face. The early vacuum tubes could not produce much gain, and even with six tubes the amplifier had low power.

  5. Audio feedback - Wikipedia

    en.wikipedia.org/wiki/Audio_feedback

    Block diagram of the signal-flow for a common feedback loop [1]: 118 . Audio feedback (also known as acoustic feedback, simply as feedback) is a positive feedback situation that may occur when an acoustic path exists between an audio output (for example, a loudspeaker) and its audio input (for example, a microphone or guitar pickup).

  6. Hearing aid - Wikipedia

    en.wikipedia.org/wiki/Hearing_aid

    Analogue hearing aids make all the sounds picked up by the microphone louder. For example, speech and ambient noise will be made louder together. On the other hand, digital hearing aid (DHA) technology processes the sound using digital technology.

  7. Kindergartener injured in Northern California school shooting ...

    www.aol.com/kindergartener-injured-northern...

    PALERMO — One of the two kindergarteners injured in a Northern California school shooting in early December may not regain the use of his legs, the family told CBS Sacramento on Thursday.

  8. Surround sound - Wikipedia

    en.wikipedia.org/wiki/Surround_sound

    Surround microphone techniques largely depend on the setup used, therefore being biased towards the 5.1 surround setup, as this is the standard. [ 24 ] Surround recording techniques can be differentiated into those that use single arrays of microphones placed in close proximity, and those treating front and rear channels with separate arrays.

  9. A new study has uncovered a tiny fish species’s ability to produce a huge sound. Danionella cerebrum is 10 to 12 millimeters, or about 0.4 to about 0.5 inches, long and lives in shallow, murky ...