37-EN
About Time Correction
e distance between the listener and the speakers in a car vary widely
due to the complex speaker placement. is dierence in the distances
from the speakers to the listener creates a shi in the sounds image and
frequency characteristics. is is caused by the time delay between the
sound reaching the listener’s right versus the le ear.
To correct this, this unit is able to delay the audio signal to the speakers
closest to the listener. is eectively creates a perception of increased
distance for those speakers. e listener can be placed at an equal
distance between the le and right speakers for optimum staging. e
adjustment will be made for each speaker in 3.4 cm steps.
Example 1. Listening Position: Front Left Seat
Adjust the time correction level of the front le speaker to a high value
and the rear right to zero or a low value.
The sound is not balanced because the distance between the
listening position and the various speakers is dierent.
The dierence in distance between the front left speaker and the rear
right speaker is 1.75 m (68-7/8").
Here we calculate the time correction value for the front left speaker
in the diagram on the above.
Conditions:
Farthest Speaker – listening position : 2.25 m (88-9/16")
Front left speaker – listening position : 0.5 m (19-11/16")
Calculation: L = 2.25 m – 0.5 m = 1.75 m (68-7/8")
Time correction = 1.75 ÷ 343* × 1,000 = 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 dierences in the time required for
the sound to reach the listening position.
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. Listening Position: 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 dierence between the distance correction
value to the farthest speaker and the other speakers.
L = (distance to farthest speaker) – (distance to other speakers)
These values are the time correction values for the dierent
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
Time
Dierence
(msec)
Distance
(cm)
Distance
(inch)
Time
Dierence
(msec)
Distance
(cm)
Distance
(inch)
0.0 0.0 0.0 5.1 173.4 68.3
0.1 3.4 1.3 5.2 176.8 69.7
0.2 6.8 2.7 5.3 180.2 71.0
0.3 10.2 4.0 5.4 183.6 72.4
0.4 13.6 5.4 5.5 187.0 73.7
0.5 17.0 6.7 5.6 190.4 75.0
0.6 20.4 8.0 5.7 193.8 76.4
0.7 23.8 9.4 5.8 197.2 77.7
0.8 27.2 10.7 5.9 200.6 79.1
0.9 30.6 12.1 6.0 204.0 80.4
1.0 34.0 13.4 6.1 207.4 81.7
1.1 37.4 14.7 6.2 210.8 83.1
1.2 40.8 16.1 6.3 214.2 84.4
1.3 44.2 17.4 6.4 217.6 85.8
1.4 47.6 18.8 6.5 221.0 87.1
1.5 51.0 20.1 6.6 224.4 88.4
1.6 54.4 21.4 6.7 227.8 89.8
1.7 57.8 22.8 6.8 231.2 91.1
1.8 61.2 24.1 6.9 234.6 92.5
1.9 64.6 25.5 7.0 238.0 93.8
2.0 68.0 26.8 7.1 241.4 95.1
2.1 71.4 28.1 7.2 244.8 96.5
2.2 74.8 29.5 7.3 248.2 97.8
2.3 78.2 30.8 7.4 251.6 99.2
2.4 81.6 32.2 7.5 255.0 100.5
2.5 85.0 33.5 7.6 258.4 101.8
2.6 88.4 34.8 7.7 261.8 103.2
2.7 91.8 36.2 7.8 265.2 104.5
2.8 95.2 37.5 7.9 268.6 105.9
2.9 98.6 38.9 8.0 272.0 107.2
3.0 102.0 40.2 8.1 275.4 108.5
3.1 105.4 41.5 8.2 278.8 109.9
3.2 108.8 42.9 8.3 282.2 111.2
3.3 112.2 44.2 8.4 285.6 112.6
3.4 115.6 45.6 8.5 289.0 113.9
3.5 119.0 46.9 8.6 292.4 115.2
3.6 122.4 48.2 8.7 295.8 116.6
3.7 125.8 49.6 8.8 299.2 117.9
3.8 129.2 50.9 8.9 302.6 119.3
3.9 132.6 52.3 9.0 306.0 120.6
4.0 136.0 53.6 9.1 309.4 121.9
4.1 139.4 54.9 9.2 312.8 123.3
4.2 142.8 56.3 9.3 316.2 124.6
4.3 146.2 57.6 9.4 319.6 126.0
4.4 149.6 59.0 9.5 323.0 127.3
4.5 153.0 60.3 9.6 326.4 128.6
4.6 156.4 61.6 9.7 329.8 130.0
4.7 159.8 63.0 9.8 333.2 131.3
4.8 163.2 64.3 9.9 336.6 132.7
4.9 166.6 65.7
5.0 170.0 67.0
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