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2. Surround sound - Wikipedia

   en.wikipedia.org/wiki/Surround_sound

   The most common surround sound specification, the ITU's 5.1 standard, calls for 6 speakers: Center (C), in front of the listener; Left (L) and Right (R), at angles of 60°; Left Surround (LS) and Right Surround (RS) at angles of 100–120°; and a subwoofer, whose position is not critical.

3. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   Home-cinema systems typically use one subwoofer cabinet (the "1" in 5.1 surround sound). However, to "improve bass distribution in a room that has multiple seating locations, and prevent nulls with weakened bass response, some home-cinema enthusiasts use 5.2- or 7.2- or 9.2-channel surround sound systems with two subwoofer cabinets in the same ...

4. Soundbar - Wikipedia

   en.wikipedia.org/wiki/Soundbar

   It was a powered speaker system that offered stereo, Dolby Pro-Logic and AC3 surround sound from the soundbar and a separate subwoofer. The soundbar contained four 3-inch full range drivers and two 1-inch tweeters while the subwoofer housed one 8-inch dual voice coil driver.

5. Dolby - Wikipedia

   en.wikipedia.org/wiki/Dolby

   Dolby Virtual Speaker: simulates 5.1 surround sound in a setup of two standard stereo speakers. [27] Dolby Surround, Dolby Pro Logic, Dolby Pro Logic II, Dolby Pro Logic IIx, and Dolby Pro Logic IIz: these decoders expand sound to a greater number of channels. All can decode surround sound that has been matrixed into two channels; some can ...

6. 7.1 surround sound - Wikipedia

   en.wikipedia.org/wiki/7.1_surround_sound

   7.1 surround sound is the common name for an eight-channel surround audio system commonly used in home theatre configurations. It adds two additional speakers to the more conventional six-channel audio configuration. As with 5.1 surround sound, 7.1 surround sound positional audio uses the standard front left and right, center, and LFE (subwoofer

7. Stereophonic sound - Wikipedia

   en.wikipedia.org/wiki/Stereophonic_sound

   The audio engineer may, and often does, use more than two microphones (sometimes many more) and may mix them down to two tracks in ways that exaggerate the separation of the instruments, in order to compensate for the mixture that occurs when listening via speakers. Descriptions of stereophonic sound tend to stress the ability to localize the ...