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Aiwa NSX-AVF77 Manual

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19
ENGLISH
DOLBY PRO LOGIC
The Dolby Pro Logic feature and the center and rear speakers
(standard) assure full-scale home theater sound. When playing
back laser discs or video software that have been specially
recorded with four-channel sound (left, right, center, rear) and
steering logic (for sound directionality), astonishingly realistic
sound surrounds the listener to create a new level of audio/visual
entertainment.
Independent control of the four sound channels allows the listener
to enjoy the same type of sound reproduction experienced in
movie theaters. Voices are reproduced in the front and center
sound field, while ambient sounds like cars and crowds are
reproduced on all sides of the listener for an incredibly lifelike
audio/video experience. Please read the following carefully to
“tune” the system’s output to match the characteristics of your
listening space.
Check the following:
• Before using the DOLBY PRO LOGIC, adjust the proper
balance of speaker sound levels.
• Make sure the supplied speakers are properly connected and
positioned. (See page 4)
• Make sure the TV set and video unit are properly connected.
(See page 24)
• Make sure the laser disc, video tape, etc., support
H.
ADJUSTING SPEAKER LEVEL BALANCE
The unit is equipped with a built-in test signal generator called a
noise sequencer for easy balance adjustment of all four channels.
The sequencer outputs a noise signal that “travels” from channel
to channel, enabling the simple adjustment of sound level to
achieve, at the listening position, the same apparent loudness
from each channel.
Preparation
Balance the left and right speakers (page 7) before step 1 below.
Use the remote control.
1
Press the DOLBY PRO LOGIC button to select
NORMAL.
If PHANTOM or 3CH LOGIC appears, press the DOLBY PRO
LOGIC button repeatedly until NORMAL is selected.
2
Press the MANUAL SELECT (TEST) button and
hold it down for about four seconds until “L-CH”
lights.
A noise signal is sent to each channel in turn in the following
sequence.
L-CH: Left speaker R-CH: Right speaker
SUR: Surround speakers CEN: Center speaker
3
Adjust the sound level of the center and the
surround speakers.
While “CEN” or “SUR” is displayed, press the f DOWN or
UP g button to adjust the volume of the center or surround
speakers to match the level of the left and right speakers.
To adjust the balance between the left and right speakers,
use the BALANCE control while “L” or “R” is displayed.
4
Press the MANUAL SELECT (TEST) button again
to stop the noise signal.
If the surround speakers level of the SURROUND mode is
changed (See page 8), that of the DOLBY PRO LOGIC is also
changed.
About the channels
The left and right speakers create the stereo effect.
The center speaker helps achieve precise sound positioning
over a broad sound field.
The rear-mounted surround speakers enhance the “depth” of
the sound field.
To change the delay time
The surround speakers reproduce sounds a split second after
the front speakers. The delay is initially set to 20 ms
(milliseconds).
To change this standard delay time, press the MANUAL SELECT
(TEST) button on the remote control repeatedly so that “TIME”
is displayed. Then, press the f DOWN or UP g button.
Each time one of the buttons is pressed, the delay time changes
as shown below.
… 20 …


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