Operation; System Configuration; Passive 12Xt; Full Range" Mode - L-Acoustics 12XT Manuel D'utilisation

12XT
COAXIAL ENCLOSURE
user manual
VERSION 1.2
7

OPERATION

7.1

System configuration

The choice of a system configuration should be the result of an electro-acoustic study conducted by an expert (System
Engineer or Audio Consultant). However, this will not be discussed here as sound-design aspects are beyond the scope
of this manual. This study can rely on the simulations modeled in SOUNDVISION software, yielding electro-acoustic
predictions which take into account the enclosures' manufacturer data and particular situational usage, as well as the
projected environment.
Several operation modes are for building all the common configurations (L/R, L/C/R, distributed), and each mode is
associated with a set of factory presets. Other non-conforming configurations do not correspond to any preset.
The PASSIVE 12XT enclosures can be used as a standalone system in the "FULL RANGE'' mode or in combination
with subwoofers in the "HIGH-PASS'' or "HYBRID'' modes.
The ACTIVE 12XT enclosures can be used as a standalone system in the "FULL RANGE'' mode or in combination
with subwoofers in the "HIGH-PASS'' mode.
For each mode a distinction is drawn between ''FRONT'', ''FILL'', and ''MONITOR'' presets as they respectively
match front-of-house, distributed, and half-space loading applications.
!
The LA4 output channel assignment varies with the preset selected by the user.
Always check that each 12XT enclosure is connected to the correct output channel before
operating.
IMPORTANT
Note: The latest version of the preset library can be supplied by an L-ACOUSTICS
also downloadable on the L-ACOUSTICS
7.2

PASSIVE 12XT

!
Set each 12XT enclosure in PASSIVE setting by using the specific switch (see Active/Passive switch
setting reference in section 6.2).
IMPORTANT
7.2.1

"FULL RANGE" mode

In ''FULL RANGE'' mode the PASSIVE 12XT enclosures are used in standalone configurations within their nominal
bandwidth, for applications not requiring low frequency extension.
7.2.1.1
Each PASSIVE 12XT enclosure must be connected to an LA4 output channel ranging from channel 1 through 4.
Therefore a single LA4 amplified controller can drive up to four PASSIVE 12XT enclosures (Figure 6).
Note: The system resources are optimized for four PASSIVE 12XT per LA4.
12XT_UM_ML_1.2
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Connecting PASSIVE 12XT to LA4

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