L-Acoustics LA4X, Руководство пользователя

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Operation
Reverting from AES AB fallback
When the LOCKED status is recovered on channel pair AB, reverting to the initial input mode is manual.
‾XLR AB INPUT MODE ‼※
FALLBACK(CD)LOCKED 44k1
OK
XLR AB INPUT MODE
>AES/EBU< LOCKED 44k1
+ OK
‾XLR AB INPUT MODE ‼※
AES/EBU LOCKED 44k1
Procedure
1. From the XLR AB INPUT MODE menu, press the OK key.
2.
Turn the encoder wheel to select the input mode.
3. Press the OK key or the encoder wheel to validate.
AVB FALLBACK MODE
Sound cuts in case of failure of the AVB input source can be avoided with the AVB fallback option on compatible LA4X.
When the automatic fallback is on (
AVB > XLR ), the amplied controller automatically switches to the XLR input sources
in case of loss of the LOCKED status on the AVB stream.
Possible causes for the loss of the "locked" status:
• Switch or talker failure (rebooted, turned off, unplugged...).
• Cable failures.
• Disconnection or "stop streaming" requested by the AVB Controller.
• Non-Avnu certied device in the network.
Reverting to the AVB input source when the signal returns to a normal state is manual — refer to INPUT MODE (p.43). It
can also be done simultaneously for all amplied controllers in LA Network Manager.
When automatic fallback is disabled (OFF), sound is cut off in case of loss of the LOCKED status, but sound is
automatically recovered when the signal returns to a normal state.
‽AVB FALLBACK MODE ‼※
OFF
OK
AVB FALLBACK MODE
>OFF<
+ OK
‽AVB FALLBACK MODE ‼※
AVB ※ XLR
Procedure
Precautions to avoid sound cuts or level differences upon fallback
The XLR inputs must be connected to an audio source (analog or digital) playing the same program as the
AVB audio source.
When an analog source is connected to the XLR inputs, the level of the AVB audio source must be aligned to
the level of the analog audio source using AVB & AES/EBU GAIN — refer to section AES/EBU & AVB GAIN
(p.46).
Fallback and time-alignment
The propagation time of the AVB signal distribution is likely to be longer than the propagation time of the
AES/EBU or ANALOG redundant signal distribution. In this case, if some Units in the system switch to AVB
fallback, but not other Units, parts of the system are no longer time-aligned.
It is highly recommended to adopt network topologies and a system deployment that minimize these risks,
and to use the Trigger Fallback button in LA Network Manager on Units that did not switch over in order to re-
align the system until the initial cause of the problem is found and resolved.
If the connected signal source comes from a P1, enable the time-alignment option in LA Network Manager to
solve the issue.
1. From the main menu, select INPUT SETTINGS .
2.
Press the OK key or the encoder wheel to validate.
3. Turn the encoder wheel to select AVB FALLBACK MODE .
4.
Press the OK key or the encoder wheel to validate.
LA4X owner's manual (EN) version 14.1 45