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4 Divide the distances calculated for the different speakers by the speed of
sound (343 m/s temperature 20°C).
This value is the time correction value for the different speakers.
• The speed of sound fluctuates according to the temperature. The accurate speed of sound
can be achieved with the formula shown below.
Speed of sound = 331.45 + C × T
C: 0.607
T: Temperature (°C)
• Concrete examples
1. Calculating the time correction value for the front left speaker on the diagram below.
Conditions:
Distance between farthest speaker and listening position: 2.25 m (88-3/4")
Distance between front left speaker and listening position: 0.5 m (20")
Calculation: L = 2.25 m (88-3/4") – 0.5 m (20") = 1.75 m (68-3/4")
Compensation time = 1.75 ÷ 343 × 1000 = 5.1 (ms)
In other words, setting the time correction value for the front left speaker to 5.1 (ms)
sets a virtual distance matching the distance to the farthest speaker.
The sound is uneven because the distance
between the listening position and the
different speakers is different.
The difference in the distance between the
front left and rear right speakers is 1.75
meters (68-3/4").
Time correction eliminates the difference
between the time required for the sound
from the different speakers to reach the
listening position.
Setting the time correction of the front left
speaker to 5.1 ms makes it possible to
coordinate the distance from the listening
position to the speaker.
2.25m
0.5m
5.1ms
Continued