LA4X
Amplified Controller
user manual
VERSION 4.0
LA4X_UM_EN_4.0
w w w . l - a c o u s t i c s . c o m
34
4.9
INPUT SETTINGS
4.9.1
INPUT MODE
The XLR connectors of the SIGNAL panel (see section 3.4.1) can receive analog or digital signals, depending on the
type of audio sources connected to them. The input mode function allows selecting the type of signal for channel pairs
AB and CD.
The input mode selection can be different between channel pairs AB and CD.
But it cannot be different between input channels A and B, or C and D.
To select the
input mode
follow these steps:
From the main menu select
INPUT SETTINGS
and press the
OK
key or the
encoder wheel
(or
ESC
to
1.
abort).
Turn the
encoder wheel
to select
INPUT MODE AB
or
INPUT MODE CD
.
2.
Press the
OK
key or the
encoder wheel
to enter the page (or
ESC
to abort).
3.
Turn the
encoder wheel
to select ANALOG or AES/EBU.
4.
Press the
OK
key or the
encoder wheel
to validate the setting (or
ESC
to abort).
5.
Figure 32: Selecting the input mode
In Figure 32 the AES/EBU input mode has been enabled.
LOCK 44k1
is a status message indicating that the AES/EBU
input mode is active and that the digital audio source provides signals of sampling frequency of 44.1 kHz.
The LOCK status is obtained under the following conditions: a digital audio source is connected to the AES/EBU input,
the signal delivered by the source has a format supported by the controller’s digital audio card, and no loss or fault is
being detected during data transfer.
If these conditions are not fulfilled the status will turn to
LOCK-WARN
or
UNLOCK
. The LOCK-WARN status
(Figure 33 left) indicates that the incoming digital signal has a sampling frequency out of the nominal range, that does
not lead to sound cut. On the contrary, the UNLOCK status (Figure 33 right) indicates a faulty digital signal leading to
sound cut.
Figure 33: LOCK-WARN and UNLOCK statuses
Sound cut can be avoided using the FALLBACK MODE on channel pair AB and a backup audio source connected to
channel pair CD (refer to section 4.9.2). In case of UNLOCK status the CD inputs will automatically be selected,
leading to one of the screens of Figure 34.
FALLBACK (CD)
indicates that the amplified controller has switched from
inputs AB to CD. The text displayed on the right (
UNLOCK
,
LOCK-WARN
, or
LOCK 44k1
) informs the user about
the status of the digital audio source connected to AB.
Figure 34: FALLBACK statuses
