Alpine CDE-W265BT Owner's Manual (english) - Page 21

Example 2. Listening Position: All Seats

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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 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 metres) between your head and the various speakers. 2 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 Delay Number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Time Difference (msec) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 Distance (cm) 0.0 3.4 6.8 10.2 13.6 17.0 20.4 23.8 27.2 30.6 34.0 37.4 40.8 44.2 47.6 51.0 54.4 57.8 61.2 64.6 68.0 71.4 74.8 78.2 81.6 Distance (inch) 0.0 1.3 2.7 4.0 5.4 6.7 8.0 9.4 10.7 12.1 13.4 14.7 16.1 17.4 18.8 20.1 21.4 22.8 24.1 25.5 26.8 28.1 29.5 30.8 32.2 Delay Number 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 Time Difference (msec) 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.0 7.1 7.2 7.3 7.4 Distance (cm) 85.0 88.4 91.8 95.2 98.6 102.0 105.4 108.8 112.2 115.6 119.0 122.4 125.8 129.2 132.6 136.0 139.4 142.8 146.2 149.6 153.0 156.4 159.8 163.2 166.6 170.0 173.4 176.8 180.2 183.6 187.0 190.4 193.8 197.2 200.6 204.0 207.4 210.8 214.2 217.6 221.0 224.4 227.8 231.2 234.6 238.0 241.4 244.8 248.2 251.6 Distance (inch) 33.5 34.8 36.2 37.5 38.9 40.2 41.5 42.9 44.2 45.6 46.9 48.2 49.6 50.9 52.3 53.6 54.9 56.3 57.6 59.0 60.3 61.6 63.0 64.3 65.7 67.0 68.3 69.7 71.0 72.4 73.7 75.0 76.4 77.7 79.1 80.4 81.7 83.1 84.4 85.8 87.1 88.4 89.8 91.1 92.5 93.8 95.1 96.5 97.8 99.2 21-EN

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21
-EN
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
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.
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 metres) between your head and
the various speakers.
2
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 2. Listening Position: All Seats
Delay
Number
Time
Difference
(msec)
Distance
(cm)
Distance
(inch)
0
0.0
0.0
0.0
1
0.1
3.4
1.3
2
0.2
6.8
2.7
3
0.3
10.2
4.0
4
0.4
13.6
5.4
5
0.5
17.0
6.7
6
0.6
20.4
8.0
7
0.7
23.8
9.4
8
0.8
27.2
10.7
9
0.9
30.6
12.1
10
1.0
34.0
13.4
11
1.1
37.4
14.7
12
1.2
40.8
16.1
13
1.3
44.2
17.4
14
1.4
47.6
18.8
15
1.5
51.0
20.1
16
1.6
54.4
21.4
17
1.7
57.8
22.8
18
1.8
61.2
24.1
19
1.9
64.6
25.5
20
2.0
68.0
26.8
21
2.1
71.4
28.1
22
2.2
74.8
29.5
23
2.3
78.2
30.8
24
2.4
81.6
32.2
25
2.5
85.0
33.5
26
2.6
88.4
34.8
27
2.7
91.8
36.2
28
2.8
95.2
37.5
29
2.9
98.6
38.9
30
3.0
102.0
40.2
31
3.1
105.4
41.5
32
3.2
108.8
42.9
33
3.3
112.2
44.2
34
3.4
115.6
45.6
35
3.5
119.0
46.9
36
3.6
122.4
48.2
37
3.7
125.8
49.6
38
3.8
129.2
50.9
39
3.9
132.6
52.3
40
4.0
136.0
53.6
41
4.1
139.4
54.9
42
4.2
142.8
56.3
43
4.3
146.2
57.6
44
4.4
149.6
59.0
45
4.5
153.0
60.3
46
4.6
156.4
61.6
47
4.7
159.8
63.0
48
4.8
163.2
64.3
49
4.9
166.6
65.7
50
5.0
170.0
67.0
51
5.1
173.4
68.3
52
5.2
176.8
69.7
53
5.3
180.2
71.0
54
5.4
183.6
72.4
55
5.5
187.0
73.7
56
5.6
190.4
75.0
57
5.7
193.8
76.4
58
5.8
197.2
77.7
59
5.9
200.6
79.1
60
6.0
204.0
80.4
61
6.1
207.4
81.7
62
6.2
210.8
83.1
63
6.3
214.2
84.4
64
6.4
217.6
85.8
65
6.5
221.0
87.1
66
6.6
224.4
88.4
67
6.7
227.8
89.8
68
6.8
231.2
91.1
69
6.9
234.6
92.5
70
7.0
238.0
93.8
71
7.1
241.4
95.1
72
7.2
244.8
96.5
73
7.3
248.2
97.8
74
7.4
251.6
99.2
Delay
Number
Time
Difference
(msec)
Distance
(cm)
Distance
(inch)