Adjusting Input Audio Gain And Attenuation - Extron electronics MAV 44 Series User Manual

Adjusting input audio gain and attenuation

Audio/video switchers have input audio gain and attenuation adjustments. In
Audio Setup mode the audio gain or attenuation of each input can be adjusted
through a range of –18 dB to +10 dB. This adjustment range ensures that there is no
noticeable volume difference among sources. It also eliminates the need for
separate preamps or attenuators when used with professional (higher line level)
and consumer (lower line level) audio equipment (figure 3-31).
dBu dBV
+10 +8
+7 +5
+4 +2
+1 -1
-2 -3
Consumer VCR
-5 -7
-8 -10 Audio
-12 -14
Inputs
-18 -20
Low Audio
Output Level
1
IR
Audio
Inputs
dBu dBV
+10 +8
+7 +5
+4 +2
+1 -1
-2 -3
-5 -7
-8 -10
-12 -14
-18 -20
High Audio
Output Level
Pro CD Player
Figure 3-31 — Audio gain and attenuation
In Audio Setup mode, whichever input is selected for adjustment is automatically
tied to output 1. You can connect a VU meter or an audio system to output 1 to
measure or monitor the audio while you perform adjustments.
There are two ways to measure the audio level during audio setup:
• Monitor the input audio level indicator (Power LED) on the front panel.
• Connect a VU meter to output 1 and, if necessary, temporarily set the
output 1 level to the consumer (-10 dBV) level (see the Audio output level
SIS commands in chapter 4, "Remote Operation").
INPUTS OUTPUTS
2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 ENTER
MAV 88 AV Series Switcher
differences between sources
MAV 44 / 48 / 84 / 88 Matrix Switchers • Operation
dBu dBV
+10 +8
+7 +5
+4 +2
+1 -1
-2 -4
-5 -7
-8 -10
-12 -14
-18 -20
Output
Level
MAV SERIES
AV MATRIX SWITCHER
I/O
PRESET
VID +dB
AUD -dB
AUDIO SETUP
Audio System
No noticeable volume
3-19