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3. Subtract the distance to the
surround speakers from the distance
to the front speakers.
a. When setting the delay time for
the Dolby Digital surround mode,
the optimal delay time is the result-
ing figure. For example, if the front
speakers are ten feet away and the
surround speakers are five feet
away, the optimal delay time is
figured as 10-5=5. Thus, in this
example, the delay should be set at
five milliseconds.
b. When setting the delay time for
an analog surround mode (Pro
Logic, Hall, Movie or Matrix) take
the result of the subtraction and
add 15 to obtain the optimal delay
time. For example, if the front
speakers are ten feet away and the
surround speakers are five feet
away, the optimal delay time is
figured as 10-5+15=20. Thus in
this example, the delay should be
set at twenty milliseconds.
The Dolby Digital mode also provides a
separate setting for the center channel
delay mode, since the discrete nature
of Dolby Digital signals makes the
location of the center channel speaker
more critical. To set the delay for the
center channel, measure the distance
from the preferred listening position in
the center of the room to both the center
channel speaker and either the left or
right speaker.
If the distances are equal no further
adjustment is required and the center
delay should be set to zero. If the distance
to the front speakers is greater than the
distance to the center speaker you may
wish to reposition the speakers by mov-
ing the front left/right speakers closer
to the listening position or the center
speaker further away from the listening
position.
Advanced Features
29
If repositioning of the speakers is not
possible, adjust the center delay time
so that you add one millisecond of center
channel delay for each foot that the dis-
tance to the center speaker lags behind
the front speakers. For example, if the
front left/right speakers are each 10 feet
from the listening position and the
center channel speaker is 8 feet away, the
delay is figured as 10-8=2, suggesting an
optimal center delay of 2 milliseconds.
The factory settings for the delay times
are shown in the chart on page 31. If the
use of the formulas described above or
your own experimentation and prefer-
ences suggest that the delay time be
changed, the adjustment is made from
the
menu.
SURROUND MODE
Reach the menu by pressing
and then pressing the
button
¤
once so that the on-screen cursor
next to the
SURROUND MODE
then press
again. The
Select
menu (see figure #15)
ROUND MODE
will then appear. If you wish to change
the surround mode before proceeding,
use the
or
buttons
i
‹
›
desired mode is highlighted in reverse
video. Next press the
button so that
¤
the cursor is next to
CENTER CH
. (Note that center
SURROUND CH
channel delay may only be adjusted in
Dolby Digital mode.) Press the
until the desired time is highlighted
i
in reverse video and then press
the cursor is next to
RETURN TO
and press
Select j
MAIN MENU
Other adjustments may now be made, or
move the cursor to
MENU OFF
press
to exit the menu system.
Select
Digital Audio Playback
Dolby Digital
Dolby Digital (also known as AC-3) is the
latest advancement in surround sound
technology, delivering up to five full-
range surround channels (left, center,
right, left surround and right surround)
plus a special dedicated Low-Frequency
Effects (LFE) channel. This represents a
major advancement over traditional
analog surround in that each surround
channel is fully discrete and capable of
full bandwidth reproduction. Dolby
Digital is available on DVD and LV discs,
and it will be a part of the new high
definition television (HDTV) system
when digital broadcasting begins in
1998. Dolby Digital for the home is based
on the same system used to deliver digital
audio sound tracks in movie theaters,
enabling true cinema reproduction in
your home.
To utilize the Dolby Digital mode you
must have a digital source properly
Select j
connected to the AVR85. The RF digital
i
output of a laser disc player should be
is
>
connected to the
line and
the rear panel. Note that this jack is for
SUR-
use only with the RF output from an LV
player and should not be connected to
any other audio, video or digital device.
Digital datastream outputs from DVD
until the
players, HDTV receivers and CD players
should be connected to the
or
Optical
or
panel
° ·
up signal and a source for recording,
the analog outputs provided on digital
button
›
source equipment should also be con-
nected to their appropriate inputs on the
until
¤
AVR85 rear panel. (e.g., connect the
.
analog stereo audio output from a DVD
to the
DVD
and
when you connect the digital outputs).
When playing back a digital source, first
select the input using the remote or front
panel controls
select the digital source by pressing the
appropriate
. When the digital source is play-
9g
ing, the AVR85 will automatically detect
jack
on
a
AC-3 RF
AC-3/PCM
inputs on the rear
Coaxial
. In order to provide a back-
inputs
on the rear panel
•
. Next
d48)!
button
Digital Input
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