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2. RCA Photophone - Wikipedia

   en.wikipedia.org/wiki/RCA_Photophone

   Whereas the Western Electric/Westrex recorders with the ca. 1938 4-ribbon light valve (RA-1231, e.g., but not RA-1231A) were inherently capable of producing time-aligned sound negatives. The Westrex system was renamed Photophone after the Western Electric and Westrex registered trademarks were sold by AT&T and Litton Industries, respectively ...

3. List of car audio manufacturers and brands - Wikipedia

   en.wikipedia.org/wiki/List_of_car_audio...

   Panasonic (a brand of Matsushita Electric Industrial Co.) (manufacturers Fender and ELS sound systems for Volkswagen and Acura vehicles) Parrot Automotive; Pioneer (also an OEM option for many GM, Ford, Mazda pickup trucks, Toyota/Lexus and Honda vehicles) Pride Car Audio; Polk Audio; Rainbow-Audio Germen Engineering; Sanyo; Sony; Sundown Audio

4. List of film sound systems - Wikipedia

   en.wikipedia.org/wiki/List_of_film_sound_systems

   Sound systems. Year Name Number of films 2002: 12-Track Digital Sound: 40 2015: 2-Track Digital Sound : 586 1953: 3 Channel Stereo: 51 1953:

5. Vitaphone - Wikipedia

   en.wikipedia.org/wiki/Vitaphone

   Vitaphone was a sound film system used for feature films and nearly 1,000 short subjects made by Warner Bros. and its sister studio First National from 1926 to 1931. Vitaphone is the last major analog sound-on-disc system and the only one that was widely used and commercially successful.

6. Sound reinforcement system - Wikipedia

   en.wikipedia.org/wiki/Sound_reinforcement_system

   On the other hand, a sound reinforcement system can be as simple as a small public address (PA) system, consisting of, for example, a single microphone connected to a 100-watt amplified loudspeaker for a singer-guitarist playing in a small coffeehouse. In both cases, these systems reinforce sound to make it louder or distribute it to a wider ...

7. Home audio - Wikipedia

   en.wikipedia.org/wiki/Home_audio

   Modern home cinema systems typically augment the audio output from a DVD player or Blu-ray player with a multi-channel power amplifier and anywhere from two speakers and a stereo power amp (for stereo sound) to a 5.1 channel amplifier and five or more surround sound speaker cabinets (with a surround sound system).