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AJA ADA4 4-Ch Bi-directional Audio A/D and D/A Converter User Manual — User Controls
Switch 3 (LEVEL)—Control whether audio levels are professional or
consumer; affects all inputs and outputs
:
Note:
Professional audio equipment has much higher levels than consumer equipment: a 0
VU reading corresponds to +4 dBu. Connecting a profes4 dBu device to a consumer
audio input -10dBV (
-7.8 dBu)
may cause overloading, whereas the output of a consumer
device probably does not have sufficient power to drive a professional audio input. With
consumer and semi-professional audio equipment, a VU reading of 0 dB is typically
referenced to -10 dBV. 0 dBu = 0.775 VRMS.
Switch 4 (LEVEL)—Control whether audio levels are high or low;
affects all inputs
Output Level Selection Matrix For Switches 3 and 4
The following table shows the combinations of DIP switch settings required to configure the
audio output levels shown.
48 KHz/96KHz
Output Mode
(Jumper 1)
Jumper#1 selects how the AES outputs and and the AES11 reference output run. If Jumper 1
is installed, they run in 48 KHz mode. If Jumper 1 is removed, they run in 96 KHz mode.
LEFT
RIGHT
Professional Level.
+4 dBu is typical of most
professional audio
(See Output Level Selection
Matrix Table)
Consumer Level.
-10dBV (-7.8dBu) is typical of most
consumer audio
(See Output Level Selection Matrix
Table)
LEFT
RIGHT
High Level
(See Output Level Selection
Matrix Table)
Low Level
(See Output Level Selection Matrix
Table)
Output Level
DIP Switch
#3
DIP Switch
#4
Audio Levels Pro-High: 0dBFS => +24dBu
LEFT
LEFT
Audio Levels Pro-Low: 0dBFS => +18dBu
LEFT
RIGHT
Audio Levels Consumer-High:
0dBFS => +12dBu
RIGHT
LEFT
Audio Levels Consumer-Low:
0dBFS => +6dBu
RIGHT
RIGHT
