System Configuration
Delay Settings
Oneaspect of the surround modes is the
delayof audio signals between the front
speakersand the rear speakers. Each
surroundmode is factory preset with a
specificdelay time, but it is possible to
individuallyadjust the delay timing to
customtailor the sound to your individ-
ualtaste and the acoustic conditions in
yourlistening room or home theater.
Thefactory setting is appropriate for
mostrooms, but some installations
createan uncommon distance between
thefront and surround speakers that may
causethe arrival of front channel sounds
tobecome disconnected from surround
channelsounds.
Toresynchronize the front and surround
channels,follow these steps:
1. Measurethe distancefrom the
listening/viewingposition to the
frontspeakers.
2. Measurethe distancefrom the
listening/viewingposition to the
surroundspeakers.
3. Subtractthe distanceto thesurround
speakersfrom the distance to the
frontspeakers.
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 SelectorÓon the front
panel, or by pressing the Surround
Mode Selectoryon the remote,
followed by the
⁄
/
¤
buttons g
until PRO LOGIC appears in the
Main Information DisplaySand
the PRO LOGICindicator Flights.
2. Press the Delaybutton vıon
the remote or front panel. The words
S DELAY TIMEwill appear in the
Main Information DisplayS.
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