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1 SAFETY WARNINGS
SAFETY WARNINGSSAFETY WARNINGS
SAFETY 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. Heat
Do not operate the product near any heat source, such as radiators or other devices.
!
WARNING
!
IMPORTANT
!
CAUTION
!
WARNING
!
CAUTION
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7. 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.
8. 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Any part showing any sign of defect must immediately be put aside and withdrawn for use to be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.
9. 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.
10. 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.
11. 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.
!
IMPORTANT
!
WARNING
!
WARNING
!
CAUTION
!
CAU
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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 2006/42/EC
Low Voltage Directive 2006/95/EC
Applied rules and standards:
EN ISO 12100-1: 2004 (Mechanical Safety)
EN60065 (Electrical Safety)
Established at Marcoussis, France
November 9th, 2009
Christophe Pignon
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2 CONT
CONTCONT
CONTENTS
ENTSENTS
ENTS
1
SAFETY WARNINGS 1
1.1
Symbol description............................................................................................................................................1
1.2
Important safety instructions..............................................................................................................................1
1.3
EC declaration of conformity .............................................................................................................................3
2
CONTENTS 4
3
INTRODUCTION 5
3.1
Welcome to L-ACOUSTICS®............................................................................................................................5
3.2
Unpacking .........................................................................................................................................................5
4
XT COAXIAL RANGE 6
5
12XT COAXIAL ENCLOSURE 9
6
INSTALLATION 10
6.1
Stacking or flying the 12XT..............................................................................................................................10
6.2
Connecting speakers .......................................................................................................................................10
7
OPERATION 13
7.1
System configuration........................................................................................................................................13
7.2
PASSIVE 12XT ................................................................................................................................................13
7.2.1
“FULL RANGE” mode......................................................................................................................13
7.2.1.1
Description................................................................................................................... 13
7.2.1.2
Connecting the PASSIVE 12XT to the LA4.................................................................... 14
7.2.1.3
[12XTP_FR], [12XTP_FI], and [12XTP_MO] presets.................................................... 14
7.2.2
“HIGH-PASS” mode.........................................................................................................................15
7.2.2.1
Description................................................................................................................... 15
7.2.2.2
Connecting the PASSIVE 12XT to the LA4.................................................................... 15
7.2.2.3
[12XTP_FR_100], [12XTP_FI_100], and [12XTP_MO_100] presets............................. 15
7.2.3
“HYBRID’’ mode..............................................................................................................................16
7.2.3.1
Description................................................................................................................... 16
7.2.3.2
Connecting the PASSIVE 12XT and SB118 to the LA4................................................... 16
7.2.3.3
[12XTP_SB118] preset................................................................................................. 17
7.3
ACTIVE 12XT.................................................................................................................................................18
7.3.1
“FULL RANGE” mode......................................................................................................................18
7.3.1.1
Description................................................................................................................... 18
7.3.1.2
Connecting the ACTIVE 12XT to the LA4 .................................................................... 18
7.3.1.3
[12XTA_FR], [12XTA_FI], and [12XTA_MO] presets................................................... 18
7.3.2
“HIGH-PASS” mode.........................................................................................................................19
7.3.2.1
Description................................................................................................................... 19
7.3.2.2
Connecting the ACTIVE 12XT to the LA4 .................................................................... 19
7.3.2.3
[12XTA_FR_100], [12XTA_FI_100], and [12XTA_MO_100] presets............................ 20
8
CARE AND MAINTENANCE 21
8.1
Maintenance information .................................................................................................................................21
8.2
Testing procedure ...........................................................................................................................................21
8.2.1
Check of transducer and enclosure acoustic behavior........................................................................21
8.2.2
Check of mechanical assembly and rigging parts................................................................................21
8.2.3
Check of external aspect ..................................................................................................................21
8.3
Transducer and switch service.........................................................................................................................22
8.3.1
LF loudspeaker.................................................................................................................................22
8.3.2
HF diaphragm...................................................................................................................................22
8.3.3
Active/passive switch ........................................................................................................................23
8.4
Spare parts and recommended tools................................................................................................................24
9
SPECIFICATIONS 25
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3 INTRODUCTION
INTRODUCTIONINTRODUCTION
INTRODUCTION
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. It is necessary to
read this manual carefully in order to become 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 at 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. The address of the nearest distributor is available on 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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4 XT COAXIAL RANGE
XT COAXIAL RANGEXT COAXIAL RANGE
XT 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 (see also
Figure 1and Figure 2):
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
ETR12-2 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 Amplified controller
LA-RAK Touring rack containing three LA8 amplified controllers
LA NETWORK MANAGER Remote control software
SOUNDVISION Acoustical and mechanical modeling software
The XT range components are compatible with standard L-ACOUSTICS® accessories. These accessories include the
L-ACOUSTICS® SP.7, SP10, and SP25 loudspeaker cables with respective lengths of 0.7 m/2 ft,
10 m/30 ft, and 25 m/80 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 mm2 conductor cross-section (13 SWG, 11 AWG) and features
4-point Speakon® connectors.
The L-ACOUSTICS® DOFILL-LA8 cable allows connection of the 115XT HiQ enclosure to the LA8 amplified
controller. This cable features 8-point PA-COM® and 4-point Speakon® connectors and must be extended using the
L-ACOUSTICS® DO.7, DO10, or DO25 cables with respective lengths of 0.7 m/2 ft, 10 m/30 ft, and 25 m/80 ft.
Each DO cable is an 8-conductor cable with 4 mm2 conductor cross-section (13 SWG, 11 AWG) and features
8-point PA-COM® connectors. Note: The PA-COM® standard is fully compatible with the CA-COM® standard.
ALWAYS connect the new DOFILL-LA8 cable on the LA8 amplified controller for active 2-way
applications, as using the old DOFILL cable may result in damaging the loudspeaker components.
The 8XT and 12XT are driven and powered by the L-ACOUSTICS® LA4 amplified controller and the 115XT HiQ by
the LA8. 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 systems within the limits of the recommended configurations.
The L-ACOUSTICS® LA-RAK touring rack offers an advanced solution for all L-ACOUSTICS® systems covering signal
and power distribution in a comprehensive plug and play touring package. The LA-RAK was created as a universal
platform designed to facilitate cross-rental and to ensure compatibility with the L-ACOUSTICS® legacy analog cabling
standard.
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.
Up to 253 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 using 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 at www.l-acoustics.com.
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CAUTION
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Figure 2: XT range components (part 2)
DO25
DO10
DO.7
DOFILL
-
LA8
+
LA4
LA
-
RAK with
3 LA8
SP25
SP10
SP.7
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5 12XT COAXIAL ENCLOSURE
12XT COAXIAL ENCLOSURE12XT COAXIAL ENCLOSURE
12XT COAXIAL ENCLOSURE
The L-ACOUSTICS® 12XT active/passive enclosure contains a 3’’ diaphragm compression driver coaxially loaded
(for HF directivity control) by a 12’’ low frequency transducer mounted in a bass-reflex tuned enclosure.
In active configuration, the filtering is managed by the LA4 amplified controller. It encompasses advanced crossover
functions, system EQ, HF and LF transducer time-alignment, and protection of the transducers. The impedance of each
of the LF and HF sections of the 12XT enclosure is 8 ohms.
In passive configuration, the 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
4
inserts with screws
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6 INSTALLATION
INSTALLATIONINSTALLATION
INSTALLATION
6.1 Stacking or flying the 12XT
The integrated rigging components and the wedge-shaped cabinet design of the 12XT enclosure (Figure 3) allow
various setups such as:
•
••
• Wall or ceiling-mounting using the L-ACOUSTICS® ETR12-2 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/1.4 inch 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 12XT 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 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 at www.l-acoustics.com.
The ACTIVE or PASSIVE settings are selectable by a switch located behind the logo-side handle of
the enclosure. The setting is set to ACTIVE when the white mark on the switch is visible through the
handle (Figure 4a). The setting is set to PASSIVE when the white mark is not visible (Figure 4b).
ACTIVE or PASSIVE setting procedure (see the recommended tools in section 8.4):
1. Roll both rubber bands back away from the grill.
2. Remove the grill: remove the 4 Torx® screws, lift up the grill (use the flat screwdriver).
3. Select the appropriate switch setting (clockwise=PASSIVE, counterclockwise=ACTIVE).
Note: The factory 12XT default setting is the ACTIVE setting.
4. Install the grill (logo oriented towards the switch) and screw in the 4 Torx® screws at 10
mm/0.5 inch besides the previous drillings (3 N.m/27 in.lbf).
5. Put in place both rubber bands on the 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 4-point Speakon® 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 (see Figure 2 and
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
SP.7, SP10, or SP25
SP.7,
SP10,
or SP25
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CAUTION
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CAUTION
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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.
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 Ω for a single 12XT enclosure, 4 Ω for two 12XT
enclosures in parallel):
Table 1: Maximum cable length versus conductor cross-section for Damping Factor > 20
Cross-section Length for one 12XT (8 Ω load) Length for two 12XT (4 Ω load)
mm2 SWG 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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7 OPERATION
OPERATIONOPERATION
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.
Three operation modes (“FULL RANGE”, “HIGH-PASS”, and “HYBRID”), each one associated with a set of factory
presets, will allow building all the common configurations (C, LR, LCR, distributed…).
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 MONITOR presets have been optimized from the 1.3 to the 2.0 preset library versions.
The LA4 output channel assignment varies with the preset selected by the user.
ALWAYS check that the 12XT enclosures are connected to correct LA4 output channels before
operating.
Note: The latest version of the preset library can be supplied by an L-ACOUSTICS® authorized representative and is
also downloadable from the L-ACOUSTICS® web site at www.l-acoustics.com.
7.2 PASSIVE 12XT
Configure each 12XT as a PASSIVE enclosure by using the specific switch (see section 6.2).
7.2.1 “FULL RANGE” mode
7.2.1.1 Description
In ‘‘FULL RANGE’’ mode the PASSIVE 12XT enclosures are used in standalone configurations within their nominal
bandwidth (55 Hz - 20 kHz) for applications not requiring low frequency extension.
!
IMPORTANT
!
IMPORTANT
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IMPORTANT
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7.2.1.2 Connecting the PASSIVE 12XT to the 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 (see Figure 6).
Note: The system resources are optimized for four PASSIVE 12XT per LA4.
Figure 6: Four passive 12XT enclosures connected to an LA4 controller
7.2.1.3 [12XTP_FR], [12XTP_FI], and [12XTP_MO] presets
The [12XTP_FR] ‘‘FRONT’’ preset features LF and HF shelving EQ for standalone FOH applications (without
subwoofers).
The [12XTP_FI] ‘‘FILL’’ preset results in a ‘‘flat’’ contour in free field conditions for use in speech reinforcement, classical
music, or close proximity fill applications.
The [12XTP_MO] ‘‘MONITOR’’ preset results in a ‘‘flat’’ contour in half-space loading conditions for floor monitoring,
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 the ‘‘LA NETWORK MANAGER’’ user manual). The accessible parameters in ‘‘FULL
RANGE’’ mode for the PASSIVE 12XT are shown in the following chart:
Table 2: Accessible parameters in ‘‘FULL RANGE’’ mode for the 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 O O
IN B Input signal B IN_B X O
O
O
OUT 1 PASSIVE 12XT PA_A O
O
O
O
OUT 2 PASSIVE 12XT
PA_A O
O
O
O
OUT 3 PASSIVE 12XT
PA_B O
O
O
O
OUT 4 PASSIVE 12XT
PA_B O
O
O
O
* IN: input signal. A, B: channel A, B. PA: passive enclosure.
IN A
IN B
Note:
This drawing
is only a cabling scheme and
does
not
represent a
valid configuration.
OUT 2 (IN A)
OUT 1
(IN A)
OUT 3 (IN B)
OUT 4
(IN B)
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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 SB118 subwoofers. The bandwidth of the system is extended down to 32 Hz.
The recommended ratio is one PASSIVE 12XT for one SB118.
7.2.2.2 Connecting the PASSIVE 12XT to the 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 (see 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
7.2.2.3 [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 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 the ‘‘LA NETWORK MANAGER’’ user manual). Accessible parameters in ‘‘HIGH-
PASS’’ mode for the PASSIVE 12XT are shown in the following chart:
IN A
IN B
Note:
Th
is drawing
is only a cabling scheme and
does
not
represent a
valid configuration.
OUT 2 (IN A)
OUT 1
(IN A)
OUT 3 (IN B)
OUT 4
(IN B)
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Table 3: Accessible parameters in ‘‘HIGH-PASS’’ 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 O O
IN B Input signal B IN_B X O
O
O
OUT 1 PASSIVE 12XT PA_A O
O
O
O
OUT 2 PASSIVE 12XT
PA_A O
O
O
O
OUT 3 PASSIVE 12XT
PA_B O
O
O
O
OUT 4 PASSIVE 12XT
PA_B O
O
O
O
* IN: input signal. A, B: channel A, 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
7.2.3.1 Description
In ‘‘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.
7.2.3.2 Connecting the PASSIVE 12XT and SB118 to the LA4
The PASSIVE 12XT and SB118 enclosures connect to the LA4 outputs as follows: channels 1 and 3 are dedicated to one
SB118 enclosure each, and channels 2 and 4 to one PASSIVE 12XT each. Therefore, a single LA4 amplified controller
can drive up to two PASSIVE 12XT and two SB118 enclosures (see 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.
Figure 8: Two PASSIVE 12XT and two SB118 enclosures connected to an LA4 controller
IN A
OUT 2 (IN A)
OUT 1
(IN A)
OUT 3 (IN B)
IN B
Note:
This drawing
is only a cabling scheme and
does
not
represent a
valid configuration.
OUT 4
(IN B)
!
IMPORTANT
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7.2.3.3 [12XTP_SB118] preset
The [12XTP_SB118] preset features a HF shelving EQ for FOH applications. The crossover frequency between the LF
and HF sections is set at 100 Hz.
Activate the LOAD PRESET menu from the LA4 amplified controller front panel and then select the [12XTP_SB118]
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 parameters in
‘‘HYBRID’’ mode for the PASSIVE 12XT are shown in the following chart:
Table 4: Accessible parameters in ‘‘HYBRID’’ mode for the 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
O
O
IN B Input signal B IN_B X O
O
O
OUT 1 SB118 enclosure SB_A O
O
O
O
OUT 2 PASSIVE 12XT
PA_A O
O
O
X
OUT 3 SB118 enclosure
SB_B O
O
O
O
OUT 4 PASSIVE 12XT
PA_B O
O
O
X
* IN: input signal. A, B: channel A, B. PA: passive enclosure. SB: subwoofer enclosure.
12XT
12XT12XT
12XT
COAXIAL ENCLOSURE
COAXIAL ENCLOSURECOAXIAL ENCLOSURE
COAXIAL ENCLOSURE
user manual
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7.3 ACTIVE 12XT
Configure each 12XT as a PASSIVE enclosure by using the specific switch (see section 6.2).
7.3.1 “FULL RANGE” mode
7.3.1.1 Description
In ‘‘FULL RANGE’’ mode the ACTIVE 12XT enclosures are used in standalone configurations within their nominal
bandwidth (55 Hz - 20 kHz), for applications not requiring low frequency extension.
7.3.1.2 Connecting the ACTIVE 12XT to the LA4
The first two ACTIVE 12XT enclosures are connected to the output channels 1 and 3 of the LA4 controller. An
additional ACTIVE 12XT enclosure can be connected in parallel with each first one. Therefore a single LA4 amplified
controller can drive up to four ACTIVE 12XT enclosures (see 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
7.3.1.3 [12XTA_FR], [12XTA_FI], and [12XTA_MO] presets
The [12XTA_FR] ‘‘FRONT’’ preset features LF and HF shelving EQ for standalone FOH applications (without
subwoofers).
The [12XTA_FI] ‘‘FILL’’ preset results in a ‘‘flat’’ contour in free field conditions for use in speech reinforcement, classical
music, or close proximity fill applications.
The [12XTA_MO] ‘‘MONITOR’’ preset results in a ‘‘flat’’ contour in half-space loading conditions for floor monitoring,
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 the ‘‘LA NETWORK MANAGER’’ user manual). The accessible parameters in ‘‘FULL
RANGE’’ mode for the ACTIVE 12XT are shown in the following chart:
IN A
IN B
Note:
This drawing
is only a cabling scheme and
d
oes
not
represent a
valid configuration.
OUT 1
(IN A)
OUT 3
(IN B)
!
IMPORTANT
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dans d''autres langues
- English: L-Acoustics 12XT User manual
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