Alpine HDS-990 - USB Memory (Optional); About USB Playback Format; Bluetooth Operation; About Bluetooth

24 EN
sound of other speakers.
Example 2: All seats
Adjust t he time correction level of each speaker
to be almost th e same .
1 Sit in the listening position (driving position,
etc.) and measure the distance (meters)
between the head and each speaker.
2 Calc ulate the difference between the
distance correction values of t he farthest
speaker a nd other speakers.
L= (distance from the farthest speaker)-
(distance from other speakers)
These values are the time correction values of
different speakers. By setting these values,
each sou nd can reach t he listening position at
the s ame time as th e sou nd of other speakers.
Time correction value list
延迟编
号
时间差
（ms）
距离
（cm）
距离
（inch
）
延迟编
号
时间差
（ms）
距离
（cm）
距离
（inch
）
0
0.00
0.00
0.00
32
0.32
11.07
4.32
1
0.01
0.34
0.10
33
0.33
11.41
4.45
2
0.02
0.69
0.24
34
0.34
11.76
4.59
3
0.03
1.03
0.37
32
0.32
11.07
4.32
4
0.04
1.38
0.51
33
0.33
11.41
4.45
5
0.05
1.72
0.64
34
0.34
11.76
4.59
6
0.06
2.07
0.78
35
0.35
12.10
4.72
7
0.07
2.42
0.92
36
0.36
12.45
4.86
8
0.08
2.76
1.05
37
0.37
12.80
5.00
9
0.09
3.11
1.19
38
0.38
13.14
5.13
10
0.10
3.45
1.32
39
0.39
13.49
5.27
11
0.11
3.80
1.46
40
0.40
13.83
5.40
12
0.12
4.15
1.60
41
0.41
14.18
5.54
13
0.13
4.49
1.73
42
0.42
14.53
5.68
14
0.14
4.84
1.87
43
0.43
14.87
5.81
15
0.15
5.18
2.00
44
0.44
15.22
5.95
16
0.16
5.53
2.14
45
0.45
15.56
6.08
17
0.17
5.88
2.28
46
0.46
15.91
6.22
18
0.18
6.22
2.41
47
0.47
16.26
6.36
19
0.19
6.57
2.55
48
0.48
16.60
6.49
20
0.20
6.91
2.68
49
0.49
16.95
6.63
21
0.21
7.26
2.82
50
0.50
17.29
6.76
22
0.22
7.61
2.96
51
0.51
17.64
6.90
23
0.23
7.95
3.09
52
0.52
17.99
7.04
24
0.24
8.30
3.23
53
0.53
18.33
7.17
25
0.25
8.64
3.36
54
0.54
18.68
7.31
26
0.26
8.99
3.50
55
0.55
19.02
7.44
27
0.27
9.34
3.64
56
0.56
19.37
7.58
28
0.28
9.68
3.77
57
0.57
19.72
7.72
29
0.29
10.03
3.91
58
0.58
20.06
7.85
30
0.30
10.37
4.04
59
0.59
20.41
7.99
31
0.31
10.72
4.18
60
0.60
20.75
8.12
USB memor y (optional)

When the machine is connected to three
USBs at th e same time, the system will
automatically combine the contents of the
three USBs to play in the same USB audio
source.

Do not connect two or more cha rging devices
to the USB port of this unit at the same time,
otherwise normal operation ca nnot be
guaranteed.

If you connect a USB storage to this unit,
you ca n pla y M P3/ WM A /AAC /M4 A /W A V/FL
AC/APE/DSD files.
About USB Playback Format
Support playback format : MP 3/WMA/AAC/
M4A/WAV/FLAC/APE/DSD.
Maximum numbe r of playable files/folders:
10,000 files /700 folders.
Supported memory : FAT16/32, N TFS, exFAT.
Bluetooth o peration
About Bluetooth
Bluetooth is a wireless technolog y that enabl es
short-distance communication between mobil e
devices or perso nal computers. Th is enables
data transfer between Bluetooth compatible