Input Settings; Input Mode - L-Acoustics LA4X User Manual

LA4X
Amplified Controller
user manual
VERSION 4.0
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:
1. From the main menu select INPUT SETTINGS and press the OK key or the encoder wheel (or ESC to
abort).
Turn the encoder wheel to select INPUT MODE AB or INPUT MODE CD.
2.
3. Press the OK key or the encoder wheel to enter the page (or ESC to abort).
4. Turn the encoder wheel to select ANALOG or AES/EBU.
5. Press the OK key or the encoder wheel to validate the setting (or ESC to abort).
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.
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.
LA4X_UM_EN_4.0
Figure 32: Selecting the input mode
Figure 33: LOCK-WARN and UNLOCK statuses
Figure 34: FALLBACK statuses
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