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34230-AVR75 Engelsk 03/03/1998 14:19 Side 31
3. Subtract the distance to the
surround speakers from the distance
to the front speakers and multiply the
result by 3.
a. When setting the delay time for
the Dolby Digital surround mode,
the optimal delay time is the
resulting figure. For example, if the
front speakers are 3m away and the
surround speakers are 1m away,
the optimal delay time is figured
as (3-1)x3=6. Thus, in this
example, the delay should be set
at six milliseconds.
b. When setting the delay time for
an analog surround mode (Pro
Logic, Hall, Movie or Matrix) take
the result of the calculation above
and add 15 to obtain the optimal
delay time. For example, if the
front speakers are 3m away and the
surround speakers are 1m away, the
optimal delay time is figured as
(3-1)x3+15=21. 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
moving the front left/right speakers
closer
to the listening position or the center
Advanced Features
31
speaker further away from the listening
position.
If repositioning of the speakers is not
possible, adjust the center delay time
so that you add one millisecond of center
channel delay for every 30cm that the
distance to the center speaker lags
behind the front speakers. For example,
if the front left/right speakers are each
3cm from the listening position and the
center channel speaker is 2.4m away, the
delay is figured as 300cm-240cm+60cm,
suggesting an optimal center delay of 2
milliseconds.
The factory settings for the delay times
are shown in the chart on page 33. If the
use of the formulas described above or
your own experimentation and
preferences suggest that the delay time be
changed, the adjustment is made from
the
menu.
SURROUND MODE
Reach the menu by pressing
Select j
and then pressing the
button
i
¤
once so that the on-screen cursor
>
next to the
SURROUND MODE
and then press
again. The
Select
menu (see fig.
SURROUND MODE
#15, page 29) will then appear. If you
wish to change the surround mode
before proceeding, use the
or
‹
›
buttons
i
until the desired mode is
highlighted in reverse video. Next press
the
button so that the cursor is next
¤
to
or
CENTER CH
SURROUND CH
(Note that center channel delay may
only be adjusted in Dolby Digital mode.)
Press the
button
until the desired
i
›
time is highlighted in reverse video and
then press
until the cursor is next to
¤
and
RETURN TO MAIN MENU
press
. Other adjustments
Select j
may now be made, or move the cursor to
and press
to exit
Select
MENU OFF
the menu system.
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 some DVD and LV
discs, and is based on the same system
used to deliver digital audio soundtracks
in movie theaters, enabling true cinema
reproduction in your home.
To utilize the Dolby Digital mode you
must have a digital source properly
connected to the AVR75. The AC-3 RF
digital output of a laser disc player
should be connected to the
is
jack
on the rear panel. Note that this
a
line
jack is for use only with the RF output
from an LD player and should not be
connected to any other audio, video or
digital device. Digital datastream outputs
from other digital audio sources such as
DVD players, digital tuners, Mini Disc
and CD players should be connected to
the
AC-3/PCM Optical
inputs on the rear panel
.
to provide a backup signal and a source
for recording, the analog outputs pro-
vided on digital source equipment should
also be connected to their appropriate
inputs on the AVR75 rear panel. (e.g.,
connect the analog stereo audio output
from a DVD to the
DVD
the rear panel when you connect the
digital outputs).
When playing back a digital source such
as DVD, first select the input using the
remote or front panel controls
AC-3 RF
or
Coaxial
. In order
° ·
inputs
•
on
d48
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