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2. Surround sound - Wikipedia

   en.wikipedia.org/wiki/Surround_sound

   Surround sound. 16.2 channel surround sound. Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener ( surround channels ). Its first application was in movie theaters.

3. 5.1 surround sound - Wikipedia

   en.wikipedia.org/wiki/5.1_surround_sound

   The left and right surround speakers in the bottom line create the surround sound effect. 5.1 surround sound ("five-point one") is the common name for surround sound audio systems. 5.1 is the most commonly used layout in home theatres. [1] It uses five full bandwidth channels and one low-frequency effects channel (the "point one"). [2]

4. Dolby Surround 7.1 - Wikipedia

   en.wikipedia.org/wiki/Dolby_Surround_7.1

   Dolby Surround 7.1 (sometimes called Dolby 7.1 surround sound) is a sound system by Dolby Laboratories which delivers theatrical 7.1 surround sound to movie-goers. It is the most recent addition to a family of audio compression technologies developed by Dolby known as Dolby Digital . It adds two new channels to current Dolby Digital 5.1.

5. 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 ( 5.1) audio configuration. As with 5.1 surround sound, 7.1 surround sound positional audio uses the standard front left and right, center, and LFE ...

6. AV receiver - Wikipedia

   en.wikipedia.org/wiki/AV_receiver

   An audio/video receiver ( AVR) is a consumer electronics component used in a home theater. Its purpose is to receive audio and video signals from a number of sources, and to process them and provide power amplifiers to drive loudspeakers and route the video to displays such as a television, monitor or video projector.

7. Dolby Pro Logic - Wikipedia

   en.wikipedia.org/wiki/Dolby_Pro_Logic

   Although Dolby Surround was introduced as an analog format, all Dolby Digital decoders incorporate a digitally implemented Dolby Surround Pro Logic decoder for digital stereo signals that carry matrix-encoded Dolby Surround. One of the first was the MSP400 surround sound receiver and amplifier by RCA for their high-end Dimensia brand.