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50 SOUND SETTING
Calculation: L = 2.25 m - 0.5 m = 1.75 m (68-7/8 )
Time correction = 1.75 ÷ 343* × 1000 = 5.1 (ms)
* Speed of sound: 343 m/s (765 mph) at 20°C
In other words, giving the front left speaker a time
correction value of 5.1 ms makes it seem as if its distance
from the listener is the same as the distance to the farthest
speaker. Time correction eliminates the differences in the
time required for the sound to reach the listening posi-
tion. The time of the front left speaker is corrected by
5.1 ms so that its sound reaches the listening position at
the same time as the sound of other speakers.
Example 2: All Seats
Adjust the time correction level of each speaker to almost
the same level.
1. Sit in the listening position (driver's seat, etc.) and
measure the distance (in meters) between your head
and the various speakers.
2. Calculate the difference between the distance correc-
tion value to the farthest speaker and the other speak-
ers.
L = (distance to farthest speaker) - (distance to other
speakers)
These values are the time correction values for the
different speakers. Setting these values to make each
sound reach the listening position at the same time as the
sound of other speakers.
Time Correction Value List
Delay
Time Dif-
Number
ference
(ms)
0
0.0
1
0.1
2
0.2
3
0.3
4
0.4
5
0.5
6
0.6
7
0.7
8
0.8
9
0.9
10
1.0
11
1.1
12
1.2
Distance
Distance
(cm)
(inch)
0.0
0.0
3.4
1.3
6.8
2.7
10.2
4.0
13.6
5.4
17.0
6.7
20.4
8.0
23.8
9.4
27.2
10.7
30.6
12.1
34.0
13.4
37.4
14.7
40.8
16.1
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