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Details of 7.1-channel Surround Sound

There are three types of 7.1-channel surround sound systems: In the first, separate audio signals are recorded for all 7.1-channels, such as in Dolby Digital Plus of BD-Video. In the second, audio signals separated into 6.1 channels are recorded onto the disc and converted to 7.1 channels during playback, such as in DVD-Video's Dolby Digital EX and DTS-ES. And in the third, all sound sources are converted by a decoder to 7.1-channel signals, such as in Dolby Digital Pro Logic IIx.
To fully enjoy 7.1-channel surround sound, you need an AV receiver that supports 7.1-channel input, and a total of eight speakers at the front left, front right, center, left surround, right surround, left surround back and right surround back, and a subwoofer.

Details...

7.1 Channel Surround (digital discrete: Dolby Digital Plus, DTS-HD, Dolby Digital True HD)

Delivers 7 audio channels and 1 LFE channel from an 8 channel source:

• Two channels for speakers at the front - left (L_F) and right (R_F).
• One channel for speaker at the center - center (C).
• Two channels for surround speakers at the sides^{[citation needed]} - side left (L) and side right (R).

• Two channels for surround speakers at the rear - surround left (LS) and surround right (RS).
• One low-frequency effects channel (LFE).
• Describes the Dolby Digital Plus discrete Surround system. Source media, usually HD-DVD and sometimes Blu-Ray is often branded with "Dolby Digital Plus" and/or DTS-HD logos.
• Surround Sound speaker placement: (8 speaker channels in total) Surround Sound speaker placement is different for both music and movie content.

For music, speaker placement is unknown.

For movie surround, the front speakers should be placed at the edges of the screen, toed in to face the central listening location, and the tweeters should be ear height. The center speaker should be placed behind the screen (when using projection) or over or under a TV, and as close to ear height as possible. Side channel speakers should be placed high on side walls, to the left and right of the listening position, equidistant from the front speakers and the rear speakers. Rear channel speakers should be placed high on side walls, slightly behind the listening position, and should have a normal high-quality monopolar construction.

See also

Surround sound