Dolby Pro Logic; Adjusting Speaker Level Balance - Aiwa CX-NHMT75 Operating Instructions Manual

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
recorded in Dolby Surround, astonishingly realistic sound
surrounds the listener to create a new level of audio/visual
entertainment.
Independent control of the five 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 pages 4 and 5)
• Make sure the TV set and video unit are properly connected.
(See pages 4 and 5)
• Make sure the laser disc, video tape, etc., suppor t
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 5 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.
Use the remote control.
1 Press DOLBY PRO LOGIC to select "NORMAL".
"NORMAL" is displayed.
If "PHANTOM" or "3 STEREO" is displayed, press DOLBY
PRO LOGIC repeatedly until "NORMAL" is selected.
2 Press MANUAL SELECT and hold it down for
about 4 seconds until "L" flashes.
A noise signal is sent to each channel in turn in the following
sequence.
L: Left speaker CEN: Center speaker
S-L: Left surround speaker
3 Adjust the sound level of the center and the
surround speakers.
While "CEN" "S-R" or "S-L" is displayed, press f DOWN or
g UP to adjust the volume of the center or each surround
speaker to match the level of the front speakers.
To adjust the balance between the left and right front speakers,
see page 9. At this time, the DOLBY PRO LOGIC mode should
be canceled by pressing DOLBY PRO LOGIC until the "OFF"
is displayed.
4 Press MANUAL SELECT again to stop the noise
signal.
• If the surround speakers or the center speaker level of the
DOLBY PRO LOGIC is changed, that of the DSP SURROUND
system (page 11) and the DOLBY DIGITAL SURROUND (page
29) is also changed.
• While "S-L" or "S-R" is displayed, both surround speakers output
the noise signal together. However, only the sound level of one
surround speaker displayed as "S-L" or "S-R" can be adjusted.
• When the sequencer outputs a noise signal, a clicking sound
might be heard from the speakers due to the characteristics of
the circuit. This is not malfunction.
About the channels
The left and right front 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 MANUAL SELECT
on the remote control repeatedly until "TIME" is displayed. Then,
press f DOWN or g UP. Each time one of the buttons is
pressed, the delay time changes as shown below.
15 mS ↔ 20 mS ↔ 30 mS
R: Right speaker
S-R: Right surround speaker
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