Dolby Laboratories SDU4 - Manual (Page 14)

2-7
The delay setting can be estimated by using the following method:
1. Estimate the distance between the primary listening location and the
nearest surround loudspeaker, in feet. If the metric system is used,
convert the distance from meters to feet by multiplying by three (3).
2. Estimate the distance from the primary listening location to the front
center loudspeaker, in feet. If the metric system is used, multiply the
distance by three (3) to convert distance from meters to feet.
3. Subtract the distance measured in step 1 above from the distance measured
in step 2, then add 20 and round the answer to the nearest 10. The result
is the delay time, in milliseconds.
For example:
The listening location is 10 feet (3.3 meters) from the surround speakers.
The selected seat is 20 feet (6.6 meters) from the front center speaker.
The delay is set for (20-10) + 20 = 30 milliseconds, switch setting 1.
The delay time for each switch setting is:
20ms ______ 0
30ms ______ 1
40ms ______ 2
50ms ______ 3
60ms ______ 4
and so on....
150ms _____ 13
As the SDU4 will frequently be used in small rooms, it is likely that the delay
will always be set to the minimum position (0).
2.5 Input Level Setting
LEFT RIGHT
LO HI LO HI
INPUT
Figure 2.8 LED calibration meter and input adjustments
MAIN