Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 231)

227 MAESTRO User Manual
Section 2 — Basic Maestro Operation
Dim
The Dim button is used to drop the output level of the monitor output by a
preset amount. This amount defaults to 20 dB but can be changed in the
Audio Options table in Default Dim Value column. The
Dim button func-
tions as a toggle ON/OFF. The amount of attenuation will be displayed in
the eight-character readout. When
Dim is enabled, the value is displayed
and the monitor audio will decrease by the Dim amount. When Dim is dis-
abled, the value in the display and the monitor audio will return to the pre-
vious value.
Reset
The Reset button is used to reset the default monitor level. Many users
prefer to monitor audio at a preset and calibrated level. This value allows
the user to return to that level from any other level, mute, or dimmed value.
The default is -20 dB but is configurable in the Audio Options table in the
Default Monitor Reference Level column. We recommend a value between
-12 dB and -20 dB for best performance.
Figure 141. Digital Signal Levels Compared to Analog and Meter Levels
–126.25 dBu
?
+8 dBu
?
–70.09 dBu
?
–94.17 dBu
?
–118.25 dBu
?
–12 dBu
?
+28 dBu
?
–10 dBu
?
+10 dBu
?
–88.09 dBu
?
–112.17 dBu
?
–136.25 dBu
?
– 30 dBu
?
–3 dBu
?
+17 dBu
?
–81.09 dBu
?
–105.17 dBu ?
–129.25 dBu
?
–23 dBu
?
+20 dBu
?
0 dBu
?
–78.09 dBu
?
–102.17 dBu
?
–20 dBu
?
+4 dBu
?
+24 dBu
?
–74.09 dBu
?
–98.17 dBu
?
–122.25 dBu
?
–16 dBu
?
?
0 dBFS
?
–10 dBFS
?
–20 dBFS
?
–30 dBFS
?
–40 dBFS
?
–50 dBFS
?
–60 dBFS
?
–70 dBFS
?
–80 dBFS
?
–90 dBFS
17 Bits –104.11 dBFS
?
16 Bits –98.09 dBFS
?
18 Bits –110.13 dBFS
?
19 Bits –116.15 dBFS
?
20 Bits –122.17 dBFS
?
22 Bits –134.21 dBFS ?
24 Bits –146.25 dBFS
?
Ref. Level
(SMPTE)
(Recommended)
Digital Noise Floor
Max Digital Level
?
–100 dBFS
?
–110 dBFS
?
–120 dBFS
?
–130 dBFS
?
–140 dBFS
0 VU
?
+3 VU ?
–20 VU
?
(Consumer Reference Level)
–3 dBu
Analog Reference
(Recommended Pro Reference Level)
+8 dBu
Analog Reference
Digital Audio
Dynamic
Range
0 dBu
Analog Reference
–10 dBu
Analog Reference
+4 dBu
Analog Reference
VU Meter Display
PPM Meter Display +4 PPM ?
0 PPM ?
–4 PPM ?
–8 PPM ?
–12 PPM ?
–16 PPM ?
–20 PPM ?
071848204_Ana
log-Digital met
ers