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2. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.

3. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945.

4. Squelch - Wikipedia

   en.wikipedia.org/wiki/Squelch

   Look up squelch in Wiktionary, the free dictionary. In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a strong input signal. [1] Essentially, squelch is a specialized type of noise gate designed to suppress weak signals.

5. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   A portable battery-powered AM/FM broadcast receiver, used to listen to audio broadcast by local radio stations. A modern communications receiver, used in two-way radio communication stations to talk with remote locations by shortwave radio. Girl listening to vacuum tube console radio in the 1940s.

6. Air Microphone turns your iPhone into a wireless PA system

   www.engadget.com/2013-05-06-air-microphone-turns...

   Air Microphone is a US$0.99 app that uses AirPlay to connect your iPhone to an Apple TV or AirPlay-equipped amplifier to give you a wireless microphone.. The app is not hard to use. After launch ...

7. How to connect your new turntable to any audio system - Engadget

   www.engadget.com/2020-02-14-how-to-connect-your...

   The easiest and cheapest way to use a turntable with Wi-Fi–based wireless audio systems is to bypass the Wi-Fi and make an analog connection. Many Wi-Fi speakers have an analog input that you ...