Installation
Digital audio
Cables for AES/EBU digital audio
AES3 species that the nominal characteristic impedance of cables used for AES/EBU digital audio transmission
shall be 110 Ω ± 20%, and closer tolerances allow for increased transmission reliability over long lengths or
higher sampling rates.
Therefore, it is highly recommended to use high-quality AES/EBU rated cables only, although certain cables
designed for balanced analog audio prove to be acceptable at 48 kHz sampling rate over short distances.
It is recommended to use single cuts of cable between AES/EBU outputs and inputs. Using several pieces reduces
performances. If it is not possible to use single cuts, it is required to use the same model of cable between two
AES/EBU interfaces.
In case an amplied controller shuts down, the failsafe relay makes a passive connection between the AES/
EBU IN ports and the LINK ports to maintain continuity. However the signals are no longer refreshed for the next
amplied controller, so that the input cable and the link cable must be considered as a unique input cable with
regard to the maximum supported length.
In case of transmission losses, try to reduce the sampling frequency of the digital audio source. Moreover, as a
general rule, avoid using sources rated beyond 96 kHz, as the maximum possible cable length is reduced, while
the additional information is cancelled by SRC to 96 kHz.
In a daisy-chain layout, the male XLR link connectors LINK A&B and LINK C&D feed the input signals to the next amplied
controller in the signal chain.
Daisy-chaining digital audio
IN A&B
IN C&D
LINK A&B
LA4X user manual (EN) version 9.1 22
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