High-Pass" Mode; Description; Connecting The Passive 12Xt To The La4 / La4X; 12Xtp_Fr_100], [12Xtp_Fi_100], And [12Xtp_Mo_100] Presets - L-Acoustics 12XT Manuel D'utilisation

7.2.2

"HIGH-PASS" mode

7.2.2.1

Description

In ''HIGH-PASS'' mode the PASSIVE 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 PASSIVE 12XT for one SB18.
7.2.2.2

Connecting the PASSIVE 12XT to the LA4 / LA4X

Each PASSIVE 12XT enclosure must be connected to an LA4 / LA4X output channel ranging from channel 1 through 4.
Therefore a single LA4 / LA4X amplified controller can drive up to four PASSIVE 12XT enclosures (see Figure 7).
Note: The system resources are optimized for four PASSIVE 12XT per LA4 / LA4X.
Note: This drawing is only a cabling scheme and does not represent a valid configuration.
Figure 7: Four PASSIVE 12XT enclosures connected to an LA4 / LA4X controller
7.2.2.3

[12XTP_FR_100], [12XTP_FI_100], and [12XTP_MO_100] presets

The [12XTP_FR_100] ''FRONT'' preset features a HF shelving EQ and a 100 Hz high-pass filter for FOH applications
with subwoofers.
The [12XTP_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 [12XTP_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 PASSIVE 12XT are shown in the following chart:
Table 3: Accessible parameters in ''HIGH-PASS'' mode for PASSIVE 12XT
Loudspeaker
Amplifier outputs
Elements
12XT
12XT
12XT
12XT
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)
OUT 2 (IN A)
Channels
OUT 1 PA
OUT 2 PA
OUT 3 PA
OUT 4 PA
w w w . l - a c o u s t i c s . c o m
OUT 4 (IN B)
OUT 3 (IN B)
Default parameters
Routing
Gain Delay
IN A 0 dB
0 ms
IN A 0 dB 0 ms
IN B 0 dB 0 ms
IN B 0 dB 0 ms
Polarity Mute
+ ON
+ ON
+ ON
+ ON
15 en 15
15 15
EN