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LA-AES3
aes/ebu input board
USER MANUAL
VERSION 2.0
7.4
AES/EBU GAIN control page
The AES/EBU GAIN control page is for setting the LA-AES3 input gain from -12 dB to +12 dB by 0.1 dB steps. It helps
aligning the digital audio source level to the analog level value so as to ensure seamless fallback switch from AES/EBU to
ANALOG inputs in case of fallback mode activation [7.3].
The AES/EBU input gain must be set according to the audio source's analog calibration (based on manufacturer's specs
or user measurements) and the amplified controller's analog inputs calibration (0 dBfs for an input signal of +22 dBu).
The three following examples illustrate the most common cases:
If the analog source is calibrated at +18 dBu for 0 dBfs, set the AES/EBU input gain at -4 dB.
If the analog source is calibrated at +24 dBu for 0 dBfs, set the AES/EBU input gain at +2 dB.
If the analog source is calibrated at +22 dBu for 0 dBfs or if the fallback option is disabled, set the AES/EBU
input gain at +0 dB.
The AES/EBU GAIN setting procedure is the following:
1.
Display the AES/EBU GAIN control page by rotating the encoder wheel.
2.
Select the gain value between -12 dB and +12 dB as follows: hold the OUT1 key, turn the encoder wheel so as
to display the chosen value (applying in real-time), and release the key.
Note: Obtain 0.1 dB step-setting by turning the encoder wheel or 1 dB step-setting by simultaneously pressing
and turning the encoder wheel.
7.5
Precautions regarding the fallback mode
Before enabling the automatic fallback option [7.3] some precautions have to be taken in order to avoid sound cut or
level differences in case of switch from AES/EBU to ANALOG inputs:
(Compulsory)
The analog input(s) of the amplified controller [6.2.2] must be connected to an analog audio
source playing the same program as the digital audio source (generally using the analog outputs of the same
mixing desk).
(Compulsory)
The levels between the digital and analog sources must be aligned using the AES/EBU GAIN
control [7.4].
LA-AE S3_UM_ML _2.0
Figure 21: AES/EBU GAIN setting
w w w . l - a c o u s t i c s . c o m
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