Alpine HCE-C300R Owner's Manual download pdf (Page 75)

75-EN



About Time Correction

The distance between the listener and the speakers in a car vary widely

due to the complex speaker placement. This difference in the distances

from the speakers to the listener creates a shift in the sounds image and

frequency characteristics. This is caused by the time delay between the

sound reaching the listener’s right versus the left ear.

To correct this, this unit is able to delay the audio signal to the speakers

osest to the listener. This effectively creates a perception of increased

distance for those speakers. The listener can be placed at an equal

distance between the left and right speakers for optimum staging.

The adjustment will be made for each speaker in 3.4cm steps.

Adjust the time correction level of the front left speaker to a high value

d 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 different.

The difference in distance between the front left speaker and the rear

ight speaker is 1.75 m (68-7/8").

Here we calculate the time correction value for the front left speaker

n 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 differences in the time required for the

und 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.

Adjust the time correction level of each speaker to almost the same level.

Sit in the listening position (driver’s seat, etc.) and

measure the distance (in meters) between your head

and the various speakers.

Calculate the difference 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 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

Example 1. Listening Position: Front Left Seat

Example 2. Listening Position: All Seats

5.1ms

2.25m

0.5m

Delay

Number

Time

Difference

(ms)

Distance

(cm)

Distance

(inch)

Delay

Number

Time

Difference

(ms)

Distance

(cm)

Distance

(inch)

0 0.0 0.0 0.0 51 5.1 173.4 68.3

1 0.1 3.4 1.3 52 5.2 176.8 69.7

2 0.2 6.8 2.7 53 5.3 180.2 71.0

3 0.3 10.2 4.0 54 5.4 183.6 72.4

4 0.4 13.6 5.4 55 5.5 187.0 73.7

5 0.5 17.0 6.7 56 5.6 190.4 75.0

6 0.6 20.4 8.0 57 5.7 193.8 76.4

7 0.7 23.8 9.4 58 5.8 197.2 77.7

8 0.8 27.2 10.7 59 5.9 200.6 79.1

9 0.9 30.6 12.1 60 6.0 204.0 80.4

10 1.0 34.0 13.4 61 6.1 207.4 81.7

11 1.1 37.4 14.7 62 6.2 210.8 83.1

12 1.2 40.8 16.1 63 6.3 214.2 84.4

13 1.3 44.2 17.4 64 6.4 217.6 85.8

14 1.4 47.6 18.8 65 6.5 221.0 87.1

15 1.5 51.0 20.1 66 6.6 224.4 88.4

16 1.6 54.4 21.4 67 6.7 227.8 89.8

17 1.7 57.8 22.8 68 6.8 231.2 91.1

18 1.8 61.2 24.1 69 6.9 234.6 92.5

19 1.9 64.6 25.5 70 7.0 238.0 93.8

20 2.0 68.0 26.8 71 7.1 241.4 95.1

21 2.1 71.4 28.1 72 7.2 244.8 96.5

22 2.2 74.8 29.5 73 7.3 248.2 97.8

23 2.3 78.2 30.8 74 7.4 251.6 99.2

24 2.4 81.6 32.2 75 7.5 255.0 100.5

25 2.5 85.0 33.5 76 7.6 258.4 101.8

26 2.6 88.4 34.8 77 7.7 261.8 103.2

27 2.7 91.8 36.2 78 7.8 265.2 104.5

28 2.8 95.2 37.5 79 7.9 268.6 105.9

29 2.9 98.6 38.9 80 8.0 272.0 107.2

30 3.0 102.0 40.2 81 8.1 275.4 108.5

31 3.1 105.4 41.5 82 8.2 278.8 109.9

32 3.2 108 8 42.9 83 8.3 282.2 111.2

33 3.3 112 2 44.2 84 8.4 285.6 112.6

34 3.4 115 6 45.6 85 8.5 289.0 113.9

35 3.5 119.0 46.9 86 8.6 292.4 115.2

36 3.6 122.4 48.2 87 8.7 295.8 116.6

37 3.7 125 8 49.6 88 8.8 299.2 117.9

38 3.8 129 2 50.9 89 8.9 302.6 119.3

39 3.9 132 6 52.3 90 9.0 306.0 120.6

40 4.0 136.0 53.6 91 9.1 309.4 121.9

41 4.1 139.4 54.9 92 9.2 312.8 123.3

42 4.2 142 8 56.3 93 9.3 316.2 124.6

43 4.3 146 2 57.6 94 9.4 319.6 126.0

44 4.4 149 6 59.0 95 9.5 323.0 127.3

45 4.5 153.0 60.3 96 9.6 326.4 128.6

46 4.6 156.4 61.6 97 9.7 329.8 130.0

47 4.7 159 8 63.0 98 9.8 333.2 131.3

48 4.8 163 2 64.3 99 9.9 336.6 132.7

49 4.9 166 6 65.7

50 5.0 170.0 67.0

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 197 198

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Alpine HCE-C300R Owner's Manual Page 75

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