Denon AVR-2805 Operating Instructions Manual page 88

A 6.1-channel system is a conventional 5.1-channel system to which the "surround back" (SB) channel has been added. This makes it easy to
achieve sound positioned directly behind the listener, semething that was previously difficult with sources designed for conventional multi
surround speakers, in addition, the acoustic image extending between the sides and the rear is narrowed, thus greatly improving the expression
ef the surround signals fer sounds moving from the sides to the back and frem the frent to the point directly behind the listening positien.
Change of positioning and acoustic image
with 5.1-channel systems
FqDD []
I'D _'_'_ "-,
, o
O n
). . I ! _,{
o o o}Ir= r= r=
Movement of acoustic image from SR to SL
Change of positioning and acoustic image
with 6.1-channel systems
[]rmE] []
/ \\
_SL ch '_ _'=_ _:_" SRch I
N
\
000 000
SB ch /
Movement of acoustic image from SR to SB to SL
With this set, speaker(s) for 1 or 2 channels are required to achieve a 6.1-channel system (DTS-ES, etc.). Adding these speakers, however,
increases the surround effect net only with seurces recorded in 6.1 channels but also with conventienal 2- to 5.1-channel sources. The WiDE
SCREEN mode is a mode fer achieving surreund sound with up to 7.1 channels using surround back speakers, for sources recorded in
conventional Delby Surreund as well as Delby Digital 5.1-channel and DTS Surreund 5.1-channel sources. Furthermore, all the Denen original
surround modes (see page 76) are compatible with 7.1-channel playback, so you can enjoy 7.1-channel sound with any signal seurce.
• Number of surround back speakers
Though the surround back channel only consists ef 1 channel ef playback signals for 6,1-channel sources (DTS-ES, etc,), we recommend using
two speakers. When using speakers with dipolar characteristics in particular, it is essential to use twe speakers.
Using two speakers results in a smoother blend with the sound of the surround channels and better sound positioning of the surreund back
channel when listening frem a pesitien other than the center.
• Placement of the surround left and right channels when using surround back speakers
Using surround back speakers greatly impreves the positioning of the sound at the rear. Because of this, the surround left and right channels
play an important role in achieving a smooth transition of the acoustic image from the front to the back. As shown on the diagram above, in a
movie theater the surround signals are also preduced frem diagenally in front of the listeners, creating an acoustic image as if the sound were
floating in space.
To achieve these effects, we recommend placing the speakers for the surround left and right channels slightly mere tewards the front than
with conventional surround systems. Doing so sometimes increases the surround effect when playing conventional 5.1-channel sources in the
6.1 surreund or DTS-ES Matrix 6.1 mode. Check the surround effects of the various modes before selecting the surround mode.
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