21
CENTER MODE
There are 3 kinds of center modes when operating in
DOLBY Surround mode. Select the desired mode suitable to
your speaker system.
NORMAL Mode
Use this position when the center speaker is a compact
speaker which is not capable of fully reproducing bass
frequencies below 100 Hz. In this mode, the bass fre-
quencies below 100 Hz are distributed to the front left
and right speakers.
WIDE Mode
Use this position when the center speaker is an equivalent
speaker to the front left and right speakers or when it
is capable of fully reproducing bass frequencies below
100 Hz.
PHANTOM Mode
Use this position when the center speaker is not used.
The center channel sound is distributed to the left and
right front speakers.
* Dolby 3 Stereo has only NORMAL and WIDE modes, not
PHANTOM mode.
DELAY TIME
In the surround modes, the sound from the rear speakers
should be delayed slightly, relative to that from the front
speakers. The optimum delay time will depend on acoustic
properties, whether the walls and furnishings reflect or
absorb sound, etc..
It is recommended that you try different delay times to
obtain the best effect. The delay is digitally synthesized, for
the highest sound quality with minimum noise and distortion.
The delay time can be set independently for each surround
mode using the DELAY TIME button, with the current setting
shown in the display.
Delay Time Setting
Surround Mode
DOLBY PRO LOGIC
HALL/THEATER
Adjustable Range
15 ~ 30mS
15 ~ 50mS
TEST TONE
To enable the user to accurately set speaker system bal-
ance when operating in surround mode, a steady test signal
is played in one channel at a time and the levels can be
adjusted until they match each other.
A mid-frequency noise signal is used so that it will sound
similar from all speakers in the system regardless of size or
location.
The noise is automatically switched through the four chan-
nels, L-C-R-S, lasting about two seconds in each.
When the center mode is NORMAL or WIDEBAND :
The test tone is output in order of Front Left speaker
Center speaker
Front Right speaker
Rear speakers.
When the center mode is PHANTOM :
The test tone is output in order of Front Left speaker
Front Right speaker
Rear speakers.
When the surround mode is Dolby 3 Stereo :
The test tone is output in order of Front Left speaker
Center speaker
Front Right speaker.
The rear and center speaker volumes can be adjusted in 1
dB steps from -10 dB to +10 dB.
Note on delay time
By adjusting the very small time difference between the
sound output from front speakers and the sound output
from the rear speakers (that is referred to as the delay
time), it is possible to change the surround sound field
created by the surround effect.
ln the DOLBY PRO LOGIC mode, the delay time adjust-
ment range is limited by the Dolby specification to
between 15mS and 30mS.
In Hall/Theater modes, you can select between 15mS
and 50mS depending on personal preference.
Suitable Delay Time in DOLBY PRO LOGIC Surround
Play
IMPORTANT :
The test tone only operates when the unit is in Dolby Pro
Logic or Dolby 3 Stereo mode.
It will not operate in stereo, Hall or Theater modes.
11.5
b
(m)
a
9.0
7.5
6.0
4.5
3.0
1.5
0
0
1.5 3.0 4.5 6.0 7.5 9.0 11.5
30mS
30mS
30mS
25mS
20mS
15mS
15mS
15mS
(m)
Suitable
Usable
Not Suitable
a: Distance from Front Speakers
b: Distance from Rear Speakers
