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2. 7.1 surround sound - Wikipedia

   en.wikipedia.org/wiki/7.1_surround_sound

   However, whereas a 5.1 surround sound system combines both surround and rear channel effects into two channels (commonly configured in home theatre set-ups as two rear surround speakers), a 7.1 surround system splits the surround and rear channel information into four distinct channels, in which sound effects are directed to left and right ...

3. Loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker

   Wireless speakers are similar to wired powered speakers, but they receive audio signals using radio frequency (RF) waves rather than over audio cables. There is an amplifier integrated in the speaker's cabinet because the RF waves alone are not enough to drive the speaker. Wireless speakers still need power, so require a nearby AC power outlet ...

4. 22.2 surround sound - Wikipedia

   en.wikipedia.org/wiki/22.2_surround_sound

   22.2 or Hamasaki 22.2 (named after Kimio Hamasaki, a senior research engineer at NHK Science & Technology Research Laboratories in Japan) is the surround sound component of Super Hi-Vision (a new television standard with 16 times the pixel resolution (7680×4320) of HDTV (1920x1080).

5. Sound change - Wikipedia

   en.wikipedia.org/wiki/Sound_change

   A sound change, in historical linguistics, is a change in the pronunciation of a language. A sound change can involve the replacement of one speech sound (or, more generally, one phonetic feature value) by a different one (called phonetic change) or a more general change to the speech sounds that exist (phonological change), such as the merger of two sounds or the creation of a new sound.

6. Wall of Sound (Grateful Dead) - Wikipedia

   en.wikipedia.org/wiki/Wall_of_Sound_(Grateful_Dead)

   The Wall of Sound was an enormous sound reinforcement system designed in 1973 specifically for the Grateful Dead's live performances. The largest concert sound system built at that time, [1] [2] the Wall of Sound fulfilled lead designer Owsley "Bear" Stanley's desire for a distortion-free sound system that could also serve as its own monitoring ...

7. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   A late 19th-century speaking trumpet used by firefighters A small sports megaphone for cheering at sporting events, next to a 3 in (8 cm) cigarette lighter for scale. From the Ancient Greek era to the nineteenth century, before the invention of electric loudspeakers and amplifiers, megaphone cones were used by people speaking to a large audience, to make their voice project more to a large ...