Harman Kardon AVR 55, Service Manual

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System Configuration
AVR55 120 volt
7. Listen carefully and check to see if the
tone is now at the same volume level
from each channel. If further adjustment
is required, press the
Channel Select
button l and repeat steps 4 through 7
as shown above. Repeat the procedure as
often as needed until the test tone circu-
lates and has the same volume from
each channel.
8. When all adjustments have been
made, press the
Test Tone
button
once to return to normal operation.
Delay Settings
One aspect of the surround modes is the
delay of audio signals between the front
speakers and the rear speakers. Each
surround mode is factory preset with a
specific delay time, but it is possible to
individually adjust the delay timing to
custom tailor the sound to your individ-
ual taste and the acoustic conditions in
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 that may
cause the arrival of front channel sounds
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 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.
With the correct delay time figures for
your listening room calculated, first make
certain that the unit is in the Dolby Pro
Logic mode by pressing the
Surround
Mode
button
Ò
or
Dolby Surround
Mode
buttons
`
until the
Pro Logic
indicator
C
is illuminated.
Press the
Select
button
j
to begin the
adjustment process. The
Information
Display
F will show the current delay
setting, such as
REAR - 15mS
. If
adjustment is required, immediately
press the
Delay
button g on the
remote to change the setting until it is
closest to the desired time. Within five
seconds the display will return to normal
readout and the setting will be entered.
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.