L-Acoustics 12XT User manual

12XT Coaxial Enclosure
12XT Enceinte Coaxiale
VERSION 1.2
www.l-acoustics.com
EN
F
R
USER MANUAL
MANUEL D’UTILISATION

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1SAFETY WARNINGS
All information hereafter detailed applies for the L-ACOUSTICS®12XT Coaxial Enclosure, designated in this
section as ‘‘the product’’.
1.1 Symbol description
Throughout this manual the potential risks are indicated by the following symbols:
The WARNING symbol indicates a potential risk of physical harm to the user or people within close
proximity to the product.
In addition, the product may also be damaged.
The CAUTION symbol notifies the user about information to prevent possible product damage.
The IMPORTANT symbol is a notification of an important recommendation of use.
1.2 Important safety instructions
1. Read this manual
2. Heed all safety warnings
3. Follow all instructions
4. The user should never incorporate equipment or accessories not approved by L-ACOUSTICS®
5. Sound Levels
Sound systems are capable of producing high Sound Pressure Levels which can be dangerous and
potentially cause hearing damage especially when exposed to them over a long period of time.
Do not stay within close proximity of the loudspeakers when operating.
6. Environments
Use the product only in E1, E2, E3, or E4 environments according to EN55103-2 standard.
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7. Heat
Do not operate the product near any heat source, such as radiators or other devices.
8. Water and moisture
Even if the product is weather-resistant, it can not be exposed to moisture (rain, sea spray, shower,
steam) for a long period of time, nor put in direct contact or partially immersed in water.
This would cause irreversible damage to exposed components.
9. System Parts and Rigging inspection
All system components must be inspected before use, in order to detect any possible defects.
Please refer to the “Care and Maintenance” section of this manual as well as any other manuals
pertaining to the system for a detailed description of the inspection procedure.
Any part showing any sign of defect must immediately be put aside and withdrawn for use to be
inspected by qualified service personnel.
10. Mounting instructions
Do not place the product on an unstable cart, stand, tripod, bracket, or table.
The product may fall and be seriously damaged, and may cause serious human injury.
Any mounting of the product should follow the manufacturer’s instructions given in this manual,
and should use a mounting accessory recommended by the manufacturer.
11. Conditions which require immediate service
Servicing is required when the product has been damaged in any way such as:
•The product has been exposed to rain or moisture,
•The product was dropped or the enclosure is damaged,
•The product does not operate normally.
12. Manual
Keep this manual in a safe place during the product lifetime.
This manual forms an integral part of the product.
Reselling of the product is only possible if the user manual is available.
Any changes made to the product have to be documented in writing and passed on to the buyer in
the event of resale.
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1.3 EC declaration of conformity
L-ACOUSTICS®
13 rue Levacher Cintrat
Parc de la Fontaine de Jouvence
91462 Marcoussis Cedex
France
States that the following product:
Loudspeaker enclosure, 12XT
Is in conformity with the provisions of:
Machinery Directive 98/37/EC
Low Voltage Directive 73/23/EC
Applied rules and standards:
EN ISO 12100-1: 2004
EN60065
Established at Marcoussis, France
January 8th, 2007
Jacques Spillmann

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2CONTENTS
1SAFETY WARNINGS 1
1.1 Symbol description .................................................................................................................................................. 1
1.2 Important safety instructions................................................................................................................................... 1
1.3 EC declaration of conformity .................................................................................................................................. 3
2CONTENTS 4
3INTRODUCTION 5
3.1 Welcome to L-ACOUSTICS®................................................................................................................................. 5
3.2 Unpacking................................................................................................................................................................ 5
4XT COAXIAL RANGE 6
512XT COAXIAL ENCLOSURE 8
6INSTALLATION 9
6.1 Stacking or flying the 12XT ..................................................................................................................................... 9
6.2 Connecting speakers ............................................................................................................................................... 9
7OPERATION 12
7.1 System configuration ............................................................................................................................................. 12
7.2 PASSIVE 12XT....................................................................................................................................................... 12
7.2.1 “FULL RANGE” mode........................................................................................................................... 12
7.2.1.1 Connecting PASSIVE 12XT to LA4....................................................................................12
7.2.1.2 [12XTP_FR], [12XTP_FI], and [12XTP_MO] presets ......................................................13
7.2.2 “HIGH-PASS” mode .............................................................................................................................. 14
7.2.2.1 Connecting PASSIVE 12XT to LA4....................................................................................14
7.2.2.2 [12XTP_FR_100], [12XTP_FI_100], and [12XTP_MO_100] presets ..............................14
7.2.3 “HYBRID’’ mode.................................................................................................................................... 15
7.2.3.1 Connecting PASSIVE 12XT and SB118 to LA4..................................................................15
7.2.3.2 [12XTP_SB118] preset......................................................................................................16
7.3 ACTIVE 12XT ....................................................................................................................................................... 17
7.3.1 “FULL RANGE” mode........................................................................................................................... 17
7.3.1.1 Connecting ACTIVE 12XT to LA4 ....................................................................................17
7.3.1.2 [12XTA_FR], [12XTA_FI], and [12XTA_MO] presets .....................................................17
7.3.2 “HIGH-PASS” mode .............................................................................................................................. 18
7.3.2.1 Connecting ACTIVE 12XT to LA4 ....................................................................................18
7.3.2.2 [12XTA_FR_100], [12XTA_FI_100], and [12XTA_MO_100] presets .............................19
8CARE AND MAINTENANCE 20
8.1 Maintenance information....................................................................................................................................... 20
8.2 Testing procedure ................................................................................................................................................. 20
8.2.1 Check of transducer and enclosure acoustic behavior .......................................................................... 20
8.2.2 Check of mechanical assembly and rigging parts ................................................................................... 20
8.2.3 Check of external aspect ....................................................................................................................... 20
8.3 Transducer and switch service .............................................................................................................................. 21
8.3.1 LF loudspeaker....................................................................................................................................... 21
8.3.2 HF diaphragm ........................................................................................................................................ 21
8.3.3 Active/passive switch ............................................................................................................................. 22
8.4 Spare parts and recommended tools..................................................................................................................... 23
9SPECIFICATIONS 24

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3INTRODUCTION
3.1 Welcome to L-ACOUSTICS®
Thank you for purchasing the L-ACOUSTICS®12XT Coaxial Enclosure.
This manual contains essential information on installing and operating the product correctly and safely. Read this manual
carefully in order to make familiar with these procedures.
As part of a continuous evolution of techniques and standards, L-ACOUSTICS®reserves the right to
change the specifications of the product and the content of this manual without prior notice. Please check
the L-ACOUSTICS®web site @ www.l-acoustics.com on a regular basis for latest update.
If the product requires repair or if information about the warranty is needed, please contact an approved
L-ACOUSTICS®distributor. In order to obtain the address of the nearest distributor go to the L-ACOUSTICS®web
site.
3.2 Unpacking
Carefully open the shipping carton and check the product for any noticeable damage. Each L-ACOUSTICS® product is
tested and inspected before leaving the factory and should arrive in perfect condition.
If found to be damaged, notify the shipping company or the distributor immediately. Only the consignee may institute a
claim with the carrier for damage incurred during shipping. Be sure to save the carton and packing materials for the
carrier's inspection.

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4XT COAXIAL RANGE
The L-ACOUSTICS®12XT active/passive enclosure is the mid sized model within the L-ACOUSTICS®XT
Coaxial Range and operates over the 55 Hz to 22 kHz frequency bandwidth. The system response can be extended
down to 32 Hz with the addition of the L-ACOUSTICS®SB118 subwoofer.
The system approach developed by L-ACOUSTICS®for the XT range consists of the elements needed to fully take
advantage of the possible configurations and optimize the system. The main components of the system are:
8XT  Passive compact coaxial enclosure
12XT  Active/passive multipurpose coaxial enclosure
115XT HiQ  Active coaxial stage monitor
ETR8-2  Mounting accessory for the 8XT enclosure
ETR12  Mounting accessory for the 12XT enclosure
ETR15  Mounting accessory for the 115XT HiQ enclosure
XTLIFTBAR  Rigging accessory for the 12XT and 115XT HiQ enclosures
SB118  Subwoofer enclosure
LA4  Medium power amplified controller
LA RAK  Amp rack containing three LA8 high power amplified controllers
LA NETWORK MANAGER  Software for remote controlling the amplified controllers
SOUNDVISION  Acoustical and mechanical modeling software
Figure 1: XT range components (part 1)
ETR8-2 ETR12 ETR15
12XT 115XT HIQ
8XT
XTLIFTBA
R
SB118

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Figure 2: XT range components (part 2)
The XT range components are compatible with standard L-ACOUSTICS®accessories. These accessories include the
loudspeaker cables L-ACOUSTICS® SP.7, SP10, and SP25 with respective lengths of 0.7 m/2.3 ft., 10 m/32.8 ft., and
25 m/ 82 ft. These cables allow connection of the 8XT and 12XT enclosures to the LA4 amplified controller. Each cable
is a 4-conductor cable with 4 mm2conductor cross-section (13 SWG, 11 AWG) and features Speakon®NL4
connectors.
The L-ACOUSTICS®DOFILL-LA8 cable allows connection of the 115XT HiQ enclosure to the LA8 amplified
controller. This cable features CA-COM®8-pin type and Speakon®NL4 connectors and must be extended using the
L-ACOUSTICS®DO.7, DO10, or DO25 cables with respective lengths of 0.7 m/2.3 ft., 10 m/32.8 ft., and 25 m/ 82
ft. Each DO cable is an 8-conductor cable with 4 mm2conductor cross-section (13 SWG, 11 AWG) and features CA-
COM®8-pin type connectors.
Connecting the old DOFILL cable on the LA8 amplified controller for an active 2-way application
may result in damaging the loudspeaker components.
Always connect the new DOFILL-LA8 cable on the LA8 amplified controller for active 2-way
applications.
The 8XT and 12XT are driven and powered by the L-ACOUSTICS®LA4 amplified controller. The 115XT HiQ is
driven and powered by the L-ACOUSTICS®LA8 amplified controller. These controllers ensure intelligent protection,
filtering, and equalization of the enclosures. Four channels of amplification are provided along with the OEM factory
preset libraries, ensuring the optimization and performance of the system within the limits of the recommended
configurations.
Each system design configuration should first be modeled and studied using the L-ACOUSTICS®SOUNDVISION
software. The software predictions are based on the preset parameters stored in the amplified controllers.
Several amplified controllers can be interconnected and monitored through the proprietary L-ACOUSTICS®L-NET
network using the L-ACOUSTICS®LA NETWORK MANAGER software.
Detailed description on the use of the LA4 and LA8 amplified controllers, SOUNDVISION and LA NETWORK
MANAGER software is beyond the scope of this manual. Please refer to the appropriate documentation, also available
on the L-ACOUSTICS®web site @ www.l-acoustics.com.
L
A
-RAK with 3 LA8
SOUNDVISION
LA4
LA NETWORK MANAGE
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512XT COAXIAL ENCLOSURE
L-ACOUSTICS®12XT active/passive enclosure contains a 3’’ diaphragm compression driver coaxially loaded
(for HF directivity control) onto a 12’’ low frequency transducer mounted in a bass-reflex tuned enclosure.
Managed by the LA4 amplified controller, the active filtering encompasses advanced crossover functions, system EQ,
HF and LF transducer time-alignment, and protection of the transducers. The passive 12XT onboard crossover
network uses proprietary third order filters. The linearization and protection of the transducers is defined by the drive
parameters contained in the LA4 amplified controller. The nominal impedance of the 12XT enclosure is 8 ohms.
The coaxial transducer arrangement produces a 90° axi-symmetric directivity output along with a smooth tonal
response free of secondary lobes over the entire frequency range.
The wedge-shaped cabinet design makes the 12XT perfectly suited to all stacked sound reinforcement applications.
The cabinet can also be flown as well as pole, wall, or ceiling-mounted.
The 12XT cabinet is made of high grade Baltic birch plywood with remarkable mechanical and acoustical properties for
improved long term durability.
Figure 3: The 12XT enclosure
Grill
active/passive switch
Wedge-shaped cabinetry
Safety eyebolt
insert
Pole mount socket
predrilled template

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6INSTALLATION
6.1 Stacking or flying the 12XT
The integrated rigging components and the wedge-shaped cabinet design of the 12XT enclosure (Figure 3) allow for
various setups such as:
•Wall or ceiling-mounting using the L-ACOUSTICS®ETR12 mounting accessory.*
•Wall or ceiling-mounting using the OMNIMOUNT®120.0 SERIES mounting accessories (four M8 inserts).*
•Flying using the L-ACOUSTICS®XTLIFTBAR rigging accessory.*
•Mounting to a 35 mm/1.38 in. pole stand using the integrated pole socket.
•Stacking with two fixed angle settings of 30° and 60° with regard to the vertical.
* A safety eye-bolt accessory can be added using the M8 insert located on the rear face of the 8XT enclosure.
Note: The “M8” notation refers to the European standard (see applicable external documentation).
Refer to the “XT and P - Rigging Procedures’’ manual to get acquainted with the XT Range
specific rigging procedures.
6.2 Connecting speakers
The 12XT enclosure is driven and powered by the dedicated L-ACOUSTICS®LA4 amplified controller. Each LA4
amp channel can drive one PASSIVE 12XT enclosure. Channels 1 and 3 can drive one or two (in parallel) ACTIVE
12XT enclosures. For more details please refer to the “LA4 - User Manual’’ also available on the L-ACOUSTICS®
web site @ www.l-acoustics.com.
ACTIVE or PASSIVE setting is selectable by a switch located behind the logo side handle of the
enclosure. Active setting is available when the white mark on the switch is visible through the handle
(Figure 4a). Passive setting is available when the white mark is not visible (Figure 4b).
To select ACTIVE or PASSIVE setting:
1. Roll both rubber bands back away from the grill.
2. Remove screws securing the grill.
3. Remove the grill.
4. Select appropriate switch setting (clockwise=PASSIVE, counterclockwise=ACTIVE).
Note: The factory 12XT default setting is ACTIVE setting.
5. Reverse steps from 1 to 3 to replace grill.
(a) ACTIVE setting (b) PASSIVE setting
Figure 4: The ACTIVE/PASSIVE switch positions (visible from the logo side handle)
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Always verify that the operating setting (ACTIVE or PASSIVE) selected on the 12XT enclosure
matches with the preset loaded in the LA4 amplified controller.
Inverting between ACTIVE and PASSIVE selection can cause irreversible damage to the enclosure
transducers. Any damage caused by such an inversion will not be covered by warranty.
The 12XT enclosure is equipped with two Speakon®NL4 connectors wired in parallel, allowing connection with a
second 12XT enclosure in parallel using one of the L-ACOUSTICS®SP.7, SP10, or SP25 cables.
The same cables are recommended to connect the 12XT enclosure to the LA4 amplified controller (Figure 5).
A maximum of one PASSIVE 12XT enclosure can be connected per LA4 output channel.
A maximum of two ACTIVE 12XT enclosures can be connected to each of the LA4 1 and 3 output
channels.
The L-ACOUSTICS®wiring convention is as follows:
Speakon®connector labels Connection to transducers
(PASSIVE 12XT)
Connection to transducers
(ACTIVE 12XT)
1+ IN + LF +
1- IN - LF -
2+ Not used HF +
2- Not used HF -
Figure 5: Connecting two ACTIVE 12XT in parallel to the channel 1 of an LA4 controller
To ensure both high performance and safety, L-ACOUSTICS®recommends the exclusive use of
high-quality, fully insulated speaker cables made of stranded copper wire.
In order to preserve a high damping factor it is desirable to keep loudspeaker cables as short as
possible and with a gauge offering low resistance per unit length.
SP.7, SP10, or SP25
SP.7,
SP10,
or SP25
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The following table provides information regarding the recommended length versus wire cross-section. Two cases are
possible depending on the impedance load connected to the LA4 (8 Ωfor a single 12XT enclosure, 4 Ωfor two 12XT
enclosures in parallel):
Table 1: Maximum wire length versus cross-section for Damping Factor > 20
Cross-section Length for one 12XT / 8 ΩLength for two 12XT / 4 Ω
mm2SWG AWG m ft m ft
2.5 15 13 30 100 15 50
4 13 11 50 160 25 80
6 11 9 74 240 37 120
10 9 7 120 390 60 195
According to the calculation in Table 1 one SP25 cable (4mm², 25m) can be used to power two 12XT in parallel (4 Ω
load) with a damping factor still greater than 20.

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7OPERATION
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.
Note: The latest version of the preset library can be supplied by an L-ACOUSTICS®authorized representative and is
also downloadable on the L-ACOUSTICS®web site @ www.l-acoustics.com.
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).
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 Connecting PASSIVE 12XT to LA4
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.
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Figure 6: Four passive 12XT enclosures connected to an LA4 controller
7.2.1.2 [12XTP_FR], [12XTP_FI], and [12XTP_MO] presets
The [12XTP_FR] preset features a low and high frequency shelving equalization (FOH applications).
The [12XTP_FI] preset results in a nominally flat contour in free field conditions (speech reinforcement, classical music, or
fill distributed applications).
The [12XTP_MO] preset results in a nominally flat contour in half-space loading conditions (floor monitoring as well as
wall or ceiling-mounted applications).
Activate the LOAD PRESET menu from the LA4 amplified controller front panel and then select the desired preset.
Refer to the ‘‘LA4 - User Manual’’ for additional instructions. The preset is also accessible using the LA NETWORK
MANAGER software (refer to ‘‘LA NETWORK MANAGER - User Manual’’). Accessible controls in ‘‘FULL
RANGE’’ mode for PASSIVE 12XT are shown in the following chart:
Table 2: Accessible controls in ‘‘FULL RANGE’’ mode for PASSIVE 12XT
Accessible (O) and blocked (X) controls
LA4 Inputs/Outputs Elements to connect Preset
assignments* Mute Gain Delay Polarity
IN A Input signal A IN_A X O O O
IN B Input signal B IN_B X O OO
OUT 1 PASSIVE 12XT PA_A O OOO
OUT 2 PASSIVE 12XT PA_A O OOO
OUT 3 PASSIVE 12XT PA_B O OOO
OUT 4 PASSIVE 12XT PA_B O OOO
* IN: input signal. A: channel A. B: channel B. PA: passive enclosure.
OUT 1 (in A) OUT 2 (in A) OUT 3 (in B) OUT 4 (in B)
IN A
IN B
PASSIVE 12XT

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7.2.2 “HIGH-PASS” mode
In the ‘‘HIGH-PASS’’ mode the PASSIVE 12XT enclosures are 100 Hz high-pass filtered to allow for coupling with the
dedicated complimentary SB118 subwoofers. The bandwidth of the system is extended down to 32 Hz. The
recommended ratio is one PASSIVE 12XT for one SB118.
7.2.2.1 Connecting PASSIVE 12XT to LA4
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 7).
Note: The system resources are optimized for four PASSIVE 12XT per LA4.
Figure 7: Four PASSIVE 12XT enclosures connected to an LA4 controller
7.2.2.2 [12XTP_FR_100], [12XTP_FI_100], and [12XTP_MO_100] presets
The [12XTP_FR_100] preset features a high frequency shelving equalization (FOH applications). The preset also
includes a 100 Hz high-pass filter.
The [12XTP_FI_100] preset results in a nominally flat contour in free field conditions (speech reinforcement, classical
music, or fill distributed applications). The preset also includes a 100 Hz high-pass filter.
The [12XTP_MO_100] preset results in a nominally flat contour in half-space loading conditions (floor monitoring as well
as wall or ceiling-mounted applications). The preset also includes a 100 Hz high-pass filter.
Activate the LOAD PRESET menu from the LA4 amplified controller front panel and then select the desired preset.
Refer to the ‘‘LA4 - User Manual’’ for additional instructions. The preset is also accessible using the LA NETWORK
MANAGER software (refer to ‘‘LA NETWORK MANAGER - User Manual’’). Accessible controls in ‘‘HIGH-PASS’’
mode for PASSIVE 12XT are shown in the following chart:
OUT 1 (in A) OUT 2 (in A) OUT 3 (in B) OUT 4 (in B)
IN A
IN B
PASSIVE 12XT

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Table 3: Accessible controls in ‘‘HIGH-PASS’’ mode for PASSIVE 12XT
Accessible (O) and blocked (X) controls
LA4 Inputs/Outputs Elements to connect Preset
assignments* Mute Gain Delay Polarity
IN A Input signal A IN_A X O O O
IN B Input signal B IN_B X O OO
OUT 1 PASSIVE 12XT PA_A O OOO
OUT 2 PASSIVE 12XT PA_A O OOO
OUT 3 PASSIVE 12XT PA_B O OOO
OUT 4 PASSIVE 12XT PA_B O OOO
* IN: input signal. A: channel A. B: channel B. PA: passive enclosure.
Note: The complimentary SB118 subwoofers must be connected to additional LA4 or LA8 amplified controllers. Please
refer to the ‘‘SB118 - User Manual’’.
7.2.3 “HYBRID’’ mode
In the ‘‘HYBRID’’ mode the PASSIVE 12XT and SB118 enclosures are connected to the same LA4 amplified controller
thus limiting the number of required units. The bandwidth of the system is extended down to 32 Hz. The
recommended ratio is one PASSIVE 12XT for one SB118.
7.2.3.1 Connecting PASSIVE 12XT and SB118 to LA4
The PASSIVE 12XT and SB118 enclosures connect to the LA4 outputs as follows: channels 1 and 3 are dedicated to
both SB118 enclosures, channels 2 and 4 are dedicated to both PASSIVE 12XT. Therefore, a single LA4 amplified
controller can drive up to two PASSIVE 12XT and two SB118 enclosures (Figure 8).
A maximum of one SB118 enclosure can be connected per LA4 output channel 1 or 3.
Note: The system resources are optimized for two PASSIVE 12XT and two SB118 per LA4.
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Figure 8: Two PASSIVE 12XT and two SB118 enclosures connected to an LA4 controller
7.2.3.2 [12XTP_SB118] preset
The [12XTP_SB118] preset features a high frequency shelving equalization (FOH applications). The crossover
frequency between the LF and MF sections is set at 100 Hz.
Activate the LOAD PRESET menu from the LA4 amplified controller front panel and then select the desired preset.
Refer to the ‘‘LA4 - User Manual’’ for additional instructions. The preset is also accessible using the LA NETWORK
MANAGER software (refer to ‘‘LA NETWORK MANAGER - User Manual’’). Accessible controls in ‘‘HYBRID’’
mode for PASSIVE 12XT are shown in the following chart:
Table 4: Accessible controls in ‘‘HYBRID’’ mode for PASSIVE 12XT
Accessible (O) and blocked (X) parameters
LA4 Inputs/Outputs Elements to connect Preset
assignments* Mute Gain Delay Polarity
IN A Input signal A IN_A X O OO
IN B Input signal B IN_B X O OO
OUT 1 SB118 enclosure SB_A O OOO
OUT 2 PASSIVE 12XT PA_A O OOX
OUT 3 SB118 enclosure SB_B O OOO
OUT 4 PASSIVE 12XT PA_B O OOX
* IN: input signal. A: channel A. B: channel B. PA: passive enclosure. SB: subwoofer enclosure.
OUT 1 (in A) OUT 2 (in A) OUT 3 (in B) OUT 4 (in B)
IN A
IN B
PASSIVE 12XT
SB118 SB118
PASSIVE 12XT

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7.3 ACTIVE 12XT
Set each 12XT enclosure in ACTIVE setting by using the specific switch (see Active/Passive switch
setting reference in section 6.2).
7.3.1 “FULL RANGE” mode
In ‘‘FULL RANGE’’ mode the ACTIVE 12XT enclosures are used in standalone configurations within their nominal
bandwidth, for applications not requiring low frequency extension.
7.3.1.1 Connecting ACTIVE 12XT to LA4
The first two ACTIVE 12XT enclosures are connected to output channels 1 and 3 of the LA4 controller. An additional
ACTIVE 12XT enclosure can be connected in parallel with each of the first ones. Therefore a single LA4 amplified
controller can drive up to four ACTIVE 12XT enclosures (Figure 9).
Note: The system resources are optimized for two or four ACTIVE 12XT per LA4.
Figure 9: Four ACTIVE 12XT enclosures connected to an LA4 controller
7.3.1.2 [12XTA_FR], [12XTA_FI], and [12XTA_MO] presets
The [12XTA_FR] preset features a low and high frequency shelving equalization (FOH applications).
The [12XTA_FI] preset results in a nominally flat contour in free field conditions (speech reinforcement, classical music, or
fill distributed applications).
The [12XTA_MO] preset results in a nominally flat contour in half-space loading conditions (floor monitoring as well as
wall or ceiling-mounted applications).
OUT 1 (in A) OUT 3 (in B)
A
CTIVE 12XT
A
CTIVE 12XT
!
IMP
O
RTANT

12XT COAXIAL ENCLOSURE
user manual
VERSION 1.2
12XT_UM_ML_1.2 www.l-acoustics.com 18 en
Activate the LOAD PRESET menu from the LA4 amplified controller front panel and then select the desired preset.
Refer to the ‘‘LA4 - User Manual’’ for additional instructions. The preset is also accessible using the LA NETWORK
MANAGER software (refer to ‘‘LA NETWORK MANAGER - User Manual’’). Accessible controls in ‘‘FULL
RANGE’’ mode for ACTIVE 12XT are shown in the following chart:
Table 5: Accessible controls in ‘‘FULL RANGE’’ mode for ACTIVE 12XT
Accessible (O) and blocked (X) parameters
LA4 Inputs/
Outputs
Elements
to connect
Preset
assignments* Mute Gain Delay Polarity
IN A Input signal A IN_A X O OO
IN B Input signal B IN_B X O OO
OUT 1 ACTIVE 12XT LF_A O XXX
OUT 2 HF_A O XXX
OUT 3 ACTIVE 12XT LF_B O XXX
OUT 4 HF_B O XXX
* IN: input signal. A: channel A. B: channel B. LF: low frequency transducer. HF: high frequency transducer.
7.3.2 “HIGH-PASS” mode
In the ‘‘HIGH-PASS’’ mode the ACTIVE 12XT enclosures are 100 Hz high-pass filtered to allow for coupling with the
dedicated complimentary SB118 subwoofers. The bandwidth of the system is extended down to 32 Hz. The
recommended ratio is one ACTIVE 12XT for one SB118.
7.3.2.1 Connecting ACTIVE 12XT to LA4
The first two ACTIVE 12XT enclosures are connected to output channels 1 and 3 of the LA4 controller. An additional
ACTIVE 12XT enclosure can be connected in parallel with each of the first ones. Therefore a single LA4 amplified
controller can drive up to four ACTIVE 12XT enclosures (Figure 10).
Note: The system resources are optimized for two or four ACTIVE 12XT per LA4.