System Configuration
Delay Settings
One aspect of the surround modesis the
delay of audio signals between thefront
speakers and the rear speakers. Each
surround mode is factory preset witha
specific delay time, but it ispossible to
individually adjust the delay timing to
custom tailor the sound to yourindivid-
ual taste and the acoustic conditionsin
your listening room or home theater.
The factory setting is appropriate for
most rooms, but some installations
create an uncommon distance between
the front and surround speakers thatmay
cause the arrival of front channelsounds
to become disconnected from surround
channel sounds.
To resynchronize the front and surround
channels, follow these steps:
1. Measure the distance from the
listening/viewing position to the
front speakers.
2. Measure the distance from the
listening/viewing position to the
surround speakers.
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 resulting
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
the Pro Logic mode, 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 calculate 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.
NOTE: The Theater, Hall 1 and Hall 2
modes use a fixed, non-adjustable
delay time.
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 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 each foot that the
distance 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.
To set the delay times, follow these steps:
1. Put the AVR45 in the Dolby Pro Logic
mode by pressing the
Dolby Pro
Logic Selector Ó on the front
panel, or by pressing the Surround
Mode Selector y on the remote,
followed by the
⁄
/
¤
buttons g
until PRO LOGIC appears in the
Main Information Display S and
the PRO LOGIC indicator F lights.
2. Press the Delay button vıon
the remote or front panel. The words
S DELAY TIME will appear in the
Main Information Display S .
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