See also: 8 channel audio
Delivers seven audio channels and one LFE channel from an 8 channel source:
Two channels for speakers at the front—left (L) and right (R).
One channel for speaker at the center—center (C).
Two channels for surround speakers at the sides—left surround (LS) and right surround (RS).[7]
Two channels for surround speakers at the rear—left back (LB) and right back (RB).
One low-frequency effects channel (LFE).
Describes the Dolby Digital Plus discrete Surround system. Source media, usually Blu-Ray and sometimes HD DVD is often branded with "Dolby Digital Plus" and/or "DTS-HD" logos.
Layout variation for 7.1 widescreen cinema format:
Four channels for speakers at the front—left (L), Center-left (CL), right (R) and Center-Right (CR).
One channel for speaker at the center—center (C).
Two channels for surround speakers at the rear—surround left (LS) and surround right (RS).
One low-frequency effects channel (LFE).
8-channel SDDS uses this layout variation.
This variation is becoming increasingly popular in home entertainment systems, as well as for large cinema auditoria where the screen width is such that the additional channels are needed to cover all angles between the loudspeakers satisfactorily for all seats in the auditorium.
For music, speaker placement is unknown.
Placement: 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 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 on side walls, slightly behind the listening position, and should have a normal high-quality monopolar construction. Front speakers should be at ear height and surrounds should be above ear height.
