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2. Realistic (brand) - Wikipedia

   en.wikipedia.org/wiki/Realistic_(brand)

   Quatravox was the name of Realistic's synthesized four-channel output version of quadraphonic sound, which used Hafler circuitry to reproduce ambient sounds recorded by the microphones 180° out-of-phase with the intended recording (sounds recorded from opposite the microphone from the performers, i.e., studio echo, audience noise, etc.) and play them back through the rear loudspeakers out-of ...

3. Citizens band radio - Wikipedia

   en.wikipedia.org/wiki/Citizens_band_radio

   Shown with Astatic brand D-104 desk mic. Citizens band radio ( CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.

4. List of microphone manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_microphone...

   The following is a list of defunct microphone manufacturers with articles. Aiwa; Altec Lansing; American Microphone; ... Realistic; Reslosound; Voice of Music ...

5. Astatic Corporation - Wikipedia

   en.wikipedia.org/wiki/Astatic_Corporation

   Pro audio, microphones, sound equipment. Owner. DAS Companies, Omnitronics. Website. www.cadaudio.com. The Astatic Corporation is a commercial audio products manufacturer founded in Youngstown, Ohio in 1933. Astatic formed CAD Professional Microphones in 1988 as a division of Astatic. The company reorganized as Omnitronics LLC in 2000, and ...

6. Electret microphone - Wikipedia

   en.wikipedia.org/wiki/Electret_microphone

   An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor. Sound waves move the diaphragm, changing the capacitance C, which produces a corresponding voltage change across the ...

7. CB radio in the United States - Wikipedia

   en.wikipedia.org/wiki/CB_radio_in_the_United_States

   In the United States, the Citizens Band Radio Service (CBRS), commonly called citizens band radio (CB radio), is one of several personal radio services defined under Title 47 of the Code of Federal Regulations, Part 95. [ 1] It is intended to be a two-way voice communication service for use in personal and business activities of the general ...