High-Pass" Mode; Description; Connecting The Active 12Xt To The La4 / La4X; [12Xta_Fr_100], [12Xta_Fi_100], And [12Xta_Mo_100] Presets - L-Acoustics 12XT Manuel D'utilisation

7.3.2

"HIGH-PASS" mode

7.3.2.1

Description

In ''HIGH-PASS'' mode the ACTIVE 12XT enclosures are 100 Hz high-pass filtered to allow using them along with the
dedicated complimentary SB18 subwoofers. The bandwidth of the system is extended down to 32 Hz.
The recommended ratio is one ACTIVE 12XT for one SB18.
7.3.2.2

Connecting the ACTIVE 12XT to the LA4 / LA4X

The first two ACTIVE 12XT enclosures are connected to the output channels 1 and 3 of the LA4 / LA4X controller. An
additional ACTIVE 12XT enclosure can be connected in parallel with each first one. Therefore a single LA4 / LA4X
amplified controller can drive up to four ACTIVE 12XT enclosures (see Figure 10).
Note: The system resources are optimized for two or four ACTIVE 12XT per LA4 / LA4X.
Note: This drawing is only a cabling scheme and does not represent a valid configuration.
Figure 10: Four ACTIVE 12XT enclosures connected to an LA4 / LA4X controller

[12XTA_FR_100], [12XTA_FI_100], and [12XTA_MO_100] presets

The [12XTA_FR_100] ''FRONT'' preset features a HF shelving EQ and a 100 Hz high-pass filter for FOH applications
with subwoofers.
The [12XTA_FI_100] ''FILL'' preset results in a ''flat'' contour down to 100 Hz in free field conditions for use in speech
reinforcement, classical music, or close proximity fill applications.
The [12XTA_MO_100] ''MONITOR'' preset results in a ''flat'' contour down to 100 Hz in half-space loading conditions
for floor monitoring, wall, or ceiling-mounted applications.
Activate the LOAD PRESET menu from the LA4 / LA4X amplified controller front panel and then select the desired
preset. Refer to the ''LA4 / LA4X'' user manual for additional instructions. The preset is also accessible using the LA
NETWORK MANAGER software (refer to the ''LA NETWORK MANAGER'' user manual). Accessible parameters
in ''HIGH-PASS'' mode for the ACTIVE 12XT are shown in the following chart:
Table 5: Accessible parameters in the ''HIGH-PASS'' mode for the ACTIVE 12XT
Loudspeaker elements
LF
Active
HF
LF
Active
HF
Note: The complimentary SB18 subwoofers must be connected to additional LA4 / LA4X or LA8 amplified controllers.
Please refer to the ''SB18'' user manual.
12XT_UM_ML_1-4
IN A
IN B
OUT 1 (IN A)
Amplifier outputs Channels
OUT 1 LF
OUT 2 HF
OUT 3 LF
OUT 4 HF
w w w . l - a c o u s t i c s . c o m
OUT 3 (IN B)
Default parameters
Routing Gain
IN A 0 dB
IN B 0 dB
Delay Polarity Mute
ON
0 ms +
ON
ON
0 ms +
ON
19 en 19
19 19
EN