Edition:
07.02.01E 3/12 Alignment, general
928 Mixing Console
3.2.2 Voltage level ↔ Decibel
U1/U2
µV -------------------------------- dBu
mV ------------------- dBu
V ------- dBu
U1/U2
µV -------------------------------- dBu
mV ------------------- dBu
V ------- dBu
1.00
1.12
1.26
1.41
1.59
1.78
2.00
2.24
2.51
2.82
0.775
0.869
0.975
1.09
1.23
1.38
1.55
1.73
1.95
2.18
0
+1
+2
+3
+4
+5
+6
+7
+8
+9
–60
–59
–58
–57
–56
–55
–54
–53
–52
–51
–120
–119
–118
–117
–116
–115
–114
–113
–112
–111
31.6
35.5
39.8
44.7
50.1
56.2
63.1
70.8
79.4
89.1
24.5
27.5
30.8
34.6
38.8
43.6
48.9
54.8
61.5
69.0
+30
+31
+32
+33
+34
+35
+36
+37
+38
+39
–30
–29
–28
–27
–26
–25
–24
–23
–22
–21
–90
–89
–88
–87
–86
–85
–84
–83
–82
–81
3.16
3.55
3.98
4.47
5.01
5.62
6.31
7.08
7.94
8.91
2.45
2.75
3.08
3.46
3.88
4.36
4.89
5.48
6.15
6.90
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
–50
–49
–48
–47
–46
–45
–44
–43
–42
–41
–110
–109
–108
–107
–106
–105
–104
–103
–102
–101
100
112
126
141
159
178
200
224
251
282
77.5
86.9
97.5
109
123
138
155
173
195
218
+40
+41
+42
+43
+44
+45
+46
+47
+48
+49
–20
–19
–18
–17
–16
–15
–14
–13
–12
–11
–80
–79
–78
–77
–76
–75
–74
–73
–72
–71
10.0
11.2
12.6
14.1
15.9
17.8
20.0
22.4
25.1
28.2
7.75
8.69
9.75
10.9
12.3
13.8
15.5
17.3
19.5
21.8
+20
+21
+22
+23
+24
+25
+26
+27
+28
+29
–40
–39
–38
–37
–36
–35
–34
–33
–32
–31
–100
–99
–98
–97
–96
–95
–94
–93
–92
–91
316
355
398
447
501
562
631
708
794
891
245
275
308
346
388
436
489
548
615
690
+50
+51
+52
+53
+54
+55
+56
+57
+58
+59
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
–70
–69
–68
–67
–66
–65
–64
–63
–62
–61
31.6
24.5
+30 –30 –90 1000
775
60 0 –60
3.2.3 Alignment necessity
Every mixing console leaving the factory comes with an alignment
protocol containing the data of the final inspection, as:
• Alignment to customer-specific nominal level
• Frequency response, harmonic distortion, signal-to-noise ratio, noise
voltage, and crosstalk attenuation.
Aligning the console is required after changing the operating condi-
tions (nominal level) or after modifications to the console. The only
measure to be performed regularly is demagnitizing the input trans-
formers (see 3.2.8).
Note: New (spare) modules are factory-aligned to a nominal level of +6 dBu
and can be installed in the console without further measures.
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