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Surround back speakers
The THX Surround EX format adds new “Surround Back” (SB)
channels to the conventional 5.1 channel system. This makes it easy
to achieve sound positioned directly behind the listener, something
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 of the surround signals for sounds moving from the
sides to the back and from the front to the point directly behind the
listening position.
'- $
48
'3
43DI4-DI
Change of positioning and acoustic image
with 5.1-channel systems
Movement of acoustic image from SR to SL
'- $
48
'3
4-DI 43DI
4#DI
Change of positioning and acoustic image
with 6.1-channel systems
Movement of acoustic image from
SR to SB to SL
In addition to sources recorded in 6.1-channels, the surround effect of
conventional 2- to 5.1-channel sources can also be enhanced.
Other Information
About Speaker Installation
Number of surround back speakers
With THX Surround EX, the surround back channel consists of one
channel of playback signals, but we recommend using two speakers.
The modes that use the new ASA technology from THX (vpage
87) are most effective when using two monopole type surround back
speakers placed close together.
Using two speakers results in a smoother blend with the sound of the
surround channels and better sound positioning of the surround back
channel when listening from a position other than the center.
Placement of the surround left and right channels
when using surround back speakers
Using surround back speakers greatly improves 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 produced from diagonally
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 more towards the front than
with conventional surround systems. Doing so sometimes increases
the surround effect when playing conventional 5.1 channel sources in
the THX Surround EX mode. Check the surround effects of the various
modes before selecting the surround mode.
Examples of speaker layouts
Below we introduce examples of speaker layouts. Refer to these to
arrange your speakers according to their type and how you want to
use them.
G1H For THX surround EX systems
(Using surround back speakers)
q When mainly playing movies
Recommended when your surround speakers are single or 2-way
speakers.
Surround back speakers
Subwoofer
Surround
speakers
Monitor
Center speaker
Front speakers
60°
60°
Surround
speaker
Surround back
speaker
Front speaker
Point slightly
downwards
G
As seen from above
H G
As seen from the side
H
2 to 3 feet /
60 to 90 cm
Speaker(s) for one or two channels are required in order to achieve
a THX Surround EX system with the AVP-A1HDCI. Adding these,
however, allows you to achieve stronger surround effects not only
with sources recorded in THX Surround EX, but also with conventional
2- to 5.1 channel sources. The WIDE SCREEN mode is a mode for
achieving surround sound with up to 7.1 channels using surround back
speakers, for sources recorded in conventional Dolby Surround as well
as Dolby Digital 5.1 channel and DTS Surround 5.1 channel sources.
Furthermore, all the DENON original surround modes (vpage 49
“DSP Simulation Playback”) are compatible with 7.1 channel playback,
so you can enjoy 7.1 channel sound with any signal source.

Getting Started Connections Setup Playback Remote Control Multi-Zone Information Troubleshooting
AVPA1HDCIEU_0121.indd 87 2008/01/21 12:50:21
87


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