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2. 5.1 surround sound - Wikipedia

   en.wikipedia.org/wiki/5.1_surround_sound

   A prototype for five-channel surround sound, then dubbed "quintaphonic sound", was used in the 1975 film Tommy. [6]5.1 dates back to 1976, [7] when Dolby Labs modified the track usage of the six analogue magnetic soundtracks on Todd-AO 70 mm film prints.

3. Home cinema - Wikipedia

   en.wikipedia.org/wiki/Home_cinema

   The audio system requires at least a stereo power amplifier and two speakers, for stereo sound; most systems have multi-channel surround sound power amplifier and six or more speakers (a 5.1 surround sound system has left and right front speakers, a centre speaker, left and right rear speakers and a low-frequency subwoofer speaker enclosure ...

4. Audio power amplifier - Wikipedia

   en.wikipedia.org/wiki/Audio_power_amplifier

   Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus 1 Hi Fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.

5. Tube sound - Wikipedia

   en.wikipedia.org/wiki/Tube_sound

   Tube sound (or valve sound) is the characteristic sound associated with a vacuum tube amplifier (valve amplifier in British English), a vacuum tube-based audio amplifier. [1] At first, the concept of tube sound did not exist, because practically all electronic amplification of audio signals was done with vacuum tubes and other comparable ...

6. 5.1 Music Disc - Wikipedia

   en.wikipedia.org/wiki/5.1_Music_Disc

   To an article without mention: This is a redirect to an article without any mention of the redirected word or phrase.. For titles that are obvious omissions from target articles, check the rcat index for more specific templates to use instead of this rcat – examples: {{R from misspelling}} for misspellings of article titles or {{R from incorrect name}} for wrong names.

7. Negative-feedback amplifier - Wikipedia

   en.wikipedia.org/wiki/Negative-feedback_amplifier

   Paul Voigt patented a negative feedback amplifier in January 1924, though his theory lacked detail. [4] Harold Stephen Black independently invented the negative-feedback amplifier while he was a passenger on the Lackawanna Ferry (from Hoboken Terminal to Manhattan) on his way to work at Bell Laboratories (located in Manhattan instead of New Jersey in 1927) on August 2, 1927 [5] (US Patent ...