About
Time
Correction
The distance between the listener and the speakers
in
a boat vary widely
due to the complex speaker placement. This
di
fference
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
closest
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.
Example 1.'Listening
POsition:
.Front
Left
Se8tt
Adjust the time correction level
of
the front left 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
different.
The difference 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
x
1000
= 5.1 (ms)
"
Speed
OfSOlllld: 343 mls (765
mph)
al
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 meters) 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)
34-EN
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
Distance
Distance
Delay
TIme
Distance
Distance
Difference
Difference
Number
(ms)
(cm)
(inch)
Number
(ms)
(cm)
(inch)
0
0.0
00
0.0
51
51
1734
683
1
01
3.4
1.3
52 5.2
1768
69.7
2
02
68
27
53 5.3 180.2
710
3
03
10.2 4.0 54 5.4 183.6
724
4
04
13.6
54
55 5.5 187.0 73.7
5
0.5 17.0
6.7 56 5.6
1904
75.0
6
0.6
20.4
8.0
57 5.7 193.8 76.4
7 0.7
238
94
58
5.8 197.2 77.7
8
0.8
272
10.7
59
59
200.6 79.1
9
09
306
121
60
6.0 204.0 80.4
10
10
340
13.4
61
6.1
2074
81.7
11
1.1
37.4 14.7
62
62
2108
83.1
12 1.2
40.8
16.1
63
63
2142
844
13 1.3 44.2 17.4
64 6.4 217.6
858
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
69
234.6
925
19 1.9
64.6
25.5
70 7.0
2380
938
20 2.0
680
268
71
7.1
2414
95.1
21
2.1
714
28.1 72 7.2 244.8
96.5
22 2.2 74.8 29.5
73
73
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
2584
101.8
26
26
88.4
348
77 7.7
261.8
103.2
27 2.7
91.8
36.2 78 7.8 265.2 104.5
28
28
95.2 37.5 79 7.9
2686
105.9
29 2.9 98.6 38.9
80
80
2720
107.2
30
3.0 102.0 40.2
81
81
275.4
108.5
31
3.1
1054
41.5
82 8.2
2788
1099
32
3.2
1088
42.9
83
83
282.2
111.2
33
3.3
1122
44.2
84
8.4
285.6 112.6
34
3.4 115.6
456
85
85
289.0
113.9
35
3.5 119.0
469
86
8.6
292.4
115.2
36
3.6
1224
48.2
87 8.7 295.8
116.6
37 3.7 125.8
496
88
88
299.2
1179
38
3.8
129.2 50.9
89
8.9
3026
119.3
39
3.9 132.6 52.3
90
9.0 306.0 120.6
40
40
1360
53.6
91
91
3094
121.9
41
4.1
139.4 54.9
92
92
3128
123.3
42
4.2 142.8
56.3
93
93
316.2 124.6
43
4.3 146.2 57.6 94 9.4
3196
1260
44 4.4 149.6
59.0
95
9.5 323.0
1273
45
45
153.0
603
96
96
3264
128.6
46 4.6
1564
61.6
97
9.7
329.8 130.0
47 4.7
159.8 63.0
98
98
3332
131.3
48 4.8 163.2 64.3
99
9.9
3366
132.7
49 4.9 166.6 65.7
----------
50
5.0 170.0 67.0
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