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Delay Time Setting
Surround delay time setting
Center delay time setting (Dolby Digital mode only)
Delay Time Setting
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In Dolby Digital or Dolby Pro Logic mode it is assumed that the time it takes the sound from each speaker to
reach the listener, is the same. But if the time interval from the center or rear left and right speakers to the
listener is closer than the time interval from the listener to the front
left and right speaker, the sound of center or rear left and right
speaker will reach the listener first; instead of the sound of the front
speakers. (It is desirable that the sound from the front speakers reach
the listener first.)
Dolby Digital and Dolby Pro Logic modes provide speaker time delay
adjustments to resolve this problem; you can manually set the delay
time of the center or rear left and right speakers so that the sound
from all speakers will arrive simultaneously to the listener.
The interval from the speakers to the listener. If the distance from the listener to each speaker is the same in
the Dolby Digital and Dolby Pro Logic mode, the delay time of each speaker is as follows.
In Dolby Digital mode
Center delay time : 0ms, Rear delay time: 5ms
In Dolby Pro Logic mode
Center delay time : (no setting), Rear delay time : 15-30ms
If the rear delay time is set in Dolby Digital mode, in the Dolby Pro Logic mode the delay time will be set
automatically. The delay time is 1 msec per foot.
If the center and rear speakers are further than the front speak-ers from the listener, the delay time will be set
at minimum.
If the distance of DS is equal to or longer than the DF in the left figure, set the Surround Delay Time as 0ms.
Otherwise, change the setting according to the specifications below.
Ex) If the distance from front speakers to the listener is 10 ft. and from rear speakers from the listener is 5 ft.,
in the Dolby Digital mode the rear delay time is 5 msec.
10 ft. (DF) - 5 ft. (DS) = 5 ft. (B)
5 ft. (B) = 5 ft. / 1 ft. = 5msec
If the distance of DF is equal to the distance of DC in the left figure, set the Center Delay Time as 0ms.
Otherwise, change the setting according to the specifications below.
Ex) If the distance from the front speakers to the listener is 10 ft. and from the center speaker to the listener
is 8 ft., the center delay time is 2msec.
10 ft. (DF) - 8 ft. (DC) = 2 ft. (A)
2 ft. (A) / 1 ft. = 2msec
Ideal Front Speaker
Ideal Surround Speaker
RTD300 EN 7/25/03 2:36 PM Page 54
