L-Acoustics LA4X User manual

LA4X
owner's manual (EN)

Document reference: LA4X owner's manual (EN) version 14.1
Distribution date: December 17, 2019
© 2019 L-Acoustics. All rights reserved.
No part of this publication may be reproduced or transmitted in any form or by any means without the
express written consent of the publisher.

Contents
Safety................................................................................................................................................................ 6
Important safety instructions....................................................................................................................... 6
Additional important safety instructions....................................................................................................... 7
Introduction........................................................................................................................................................ 9
How to use this manual............................................................................................................................ 9
Symbols................................................................................................................................................... 9
LA4X amplied controller.........................................................................................................................10
System components...........................................................................................................................................11
Technical description......................................................................................................................................... 12
Main features......................................................................................................................................... 12
Internal components.......................................................................................................................12
Front and rear panels....................................................................................................................12
Signal processing and amplication......................................................................................................... 13
Signal inputs.................................................................................................................................13
DSP architecture............................................................................................................................14
Power supply and amplier section.................................................................................................15
Speaker outputs............................................................................................................................ 15
Speaker protection........................................................................................................................ 15
Monitoring and control............................................................................................................................15
User interface............................................................................................................................... 15
L-NET remote control network......................................................................................................... 15
Inspection and preventive maintenance...............................................................................................................16
How to do preventive maintenance.......................................................................................................... 16
External structure.....................................................................................................................................16
Cleanness...............................................................................................................................................17
Normal start-up sequence........................................................................................................................ 17
Network functionalities and rmware........................................................................................................17
Installation........................................................................................................................................................18
Mounting................................................................................................................................................18
Ventilation.............................................................................................................................................. 19
Connecting to AC mains......................................................................................................................... 19
Electrical specications.................................................................................................................. 19
Planning the power of the electrical generator................................................................................. 20
Power cord...................................................................................................................................20
Plugging the amplied controller.....................................................................................................20
3

Power consumption........................................................................................................................21
Heat power calculation..................................................................................................................21
Audio and network cabling..................................................................................................................... 21
Connection panels.........................................................................................................................21
Analog audio............................................................................................................................... 24
Digital audio................................................................................................................................ 25
L-NET........................................................................................................................................... 25
AVB............................................................................................................................................. 26
Speaker........................................................................................................................................26
Operation........................................................................................................................................................ 27
Powering on...........................................................................................................................................27
Powering off...........................................................................................................................................27
Setting to standby mode..........................................................................................................................27
Interpreting the front panel LEDs...............................................................................................................28
STATUS........................................................................................................................................ 28
L-NET........................................................................................................................................... 28
Meters..........................................................................................................................................29
OUT.............................................................................................................................................29
Main screen description.......................................................................................................................... 30
Using quick access functions....................................................................................................................31
Locking/Unlocking the front panel.................................................................................................. 31
Muting/Unmuting an output channel............................................................................................... 31
Modifying gain............................................................................................................................. 31
Identifying an amplied controller...................................................................................................32
Displaying input level, input selection, input mode and group information........................................... 33
Using the main menu.............................................................................................................................. 34
LOAD PRESET............................................................................................................................... 35
STORE PRESET..............................................................................................................................37
DELETE PRESET............................................................................................................................. 38
PRESET PARAMETERS.................................................................................................................... 38
CLEAR GROUP PARAMS................................................................................................................40
INPUT SETTINGS.......................................................................................................................... 41
MONITORING & INFO.................................................................................................................49
OPTIONS..................................................................................................................................... 52
IP SETTINGS.................................................................................................................................55
Settings protection...................................................................................................................................59
Corrective maintenance..................................................................................................................................... 61
Introduction.............................................................................................................................................61
Presentation.................................................................................................................................. 61
Equipment and tools......................................................................................................................61
4

Troubleshooting and diagnosis................................................................................................................. 62
Interface issues..............................................................................................................................62
L-NET network issues..................................................................................................................... 63
Error messages............................................................................................................................. 64
Sound issues.................................................................................................................................66
Exploded view........................................................................................................................................68
External modules...........................................................................................................................68
Disassembly and Reassembly procedures.................................................................................................. 69
D/R - Grill and foam lter............................................................................................................. 69
D/R - Side bracket........................................................................................................................70
D/R - Rear bracket........................................................................................................................71
D/R - Front handles.......................................................................................................................72
Specications................................................................................................................................................... 73
General................................................................................................................................................. 73
Input signal distribution............................................................................................................................74
Analog input.......................................................................................................................................... 74
Digital input........................................................................................................................................... 75
Latency...................................................................................................................................................75
AVB.......................................................................................................................................................76
Automatic fallback option........................................................................................................................ 76
Remote control and monitoring.................................................................................................................76
Physical data..........................................................................................................................................77
Appendix A - Glossary..................................................................................................................................... 78
Appendix B - List of AVB reservation errors.........................................................................................................78
Appendix C - Approvals................................................................................................................................... 81
5

Safety
Safety
Important safety instructions
Explanation of graphical symbols
The lightning ash with arrowhead symbol within an equilateral triangle is intended to alert the user
to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of
sufcient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important operating and maintenance instructions in the literature accompanying the product.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
ampliers) that produce heat.
9. Do not defeat the safety purpose of the grounding-type plug. A grounding-type plug has two blades and a third
grounding prong. The third prong is provided for your safety. If the provided plug does not t into your outlet,
consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the
point where they exit from the apparatus.
11. Only use attachments/accessories specied by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specied by the manufacturer, or sold with the
apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid
injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been damaged in
any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
15. WARNING: To reduce the risk of re or electric shock, this apparatus should not be exposed to rain or moisture
and objects lled with liquids, such as vases, should not be placed on this apparatus.
16. To completely disconnect this equipment from the mains, disconnect the power supply cord plug from the
receptacle.
Pour déconnecter complètement l'appareil du secteur, débranchez la prise de la che secteur.
17. The main plug of the power supply cord shall remain readily accessible.
La prise principale du cordon d'alimentation doit rester totalement accessible.
6 LA4X owner's manual (EN) version 14.1

Safety
Additional important safety instructions
Inspect the product before operation.
If any sign of defect or damage is detected, immediately withdraw the product from use for maintenance.
Perform preventive maintenance at least once a year.
Refer to the preventive maintenance section for a list of actions and their periodicity.
Insufcient upkeep of the product can void the warranty.
Verify the electrical conformity and compatibility of the mains supply.
Only connect the product to an AC power outlet rated 100-240 V, 50-60 Hz, with the following current values:
100-120 V: 20 A
200-240 V: 10 A
WARNING: The product is of CLASS 1 construction and shall be connected to a mains socket outlet with a
protective connection to earth.
When the product is used in a three-phase circuit, verify the electrical conformity and
compatibility of the three-phase circuit.
Verify that the three phases work, and balance the loads between the three phases.
Verify that the neutral and earth work.
Never try to emulate a 230 V circuit connecting an apparatus to two live wires of a 120 V three-phase circuit.
Never try to emulate a 200 V circuit connecting an apparatus to two live wires of a 100 V three-phase circuit.
Always interconnect a Class C circuit breaker between the product and the mains supply.
The circuit breaker current rating depends on the mains voltage rating, as follows:
100-120 V: 20 A
200-240 V: 10 A
Electrical generator
You must power on the generator before powering on the product.
Verify that the product is turned off before powering on the generator.
Terminals marked with the lightning ash symbol are HAZARDOUS LIVE.
The external wiring connected to these terminals requires installation by an instructed person or the use of
ready-made leads or cords.
Never attempt to touch any exposed speaker wiring while the product is operating: rst disconnect the connector
from the product.
Mute all output channels before connecting a speaker to an amplied controller.
Do not connect a speaker output in parallel or series with any output of another amplied controller.
Do not connect the speaker outputs to any other voltage source, such as a battery, power mains, or power supply,
regardless of whether the amplied controller is turned on or off.
Never incorporate equipment or accessories not approved by L-Acoustics.
Read all the related PRODUCT INFORMATION documents shipped with the products before
exploiting the system.
Intended use
This system is intended for use by trained personnel for professional applications.
As part of a continuous evolution of techniques and standards, L-Acoustics reserves the right
to change the specications of its products and the content of its documents without prior
notice.
Check www.l-acoustics.com on a regular basis to download the latest document and software updates.
Beware of sound levels.
Do not stay within close proximity of loudspeakers in operation.
LA4X owner's manual (EN) version 14.1 7

Safety
Loudspeaker systems are capable of producing very high sound pressure levels (SPL) which can instantaneously
lead to permanent hearing damage to performers, production crew and audience members. Hearing damage
can also occur at moderate level with prolonged exposure to sound.
Check the applicable laws and regulations relating to maximum sound levels and exposure times.
Beware of over power risks.
Only use compatible loudspeakers with appropriate presets to avoid damage to the loudspeakers.
Do not use the product outside its operating temperature range.
The product operates at a room temperature between 0 °C / 32 °F and 50 °C / 122 °F.
Do not expose the product to direct sun.
Only use the product in a conformed electro-magnetic environment.
Conformed environments are: E1 (residential), E2 (commercial and light industrial), E3 (urban outdoors), E4
(controlled EMC environment, ex. TV studio), as per EN55103-2 standards.
Avoid radio interference.
This product has been tested and complies with the limits indicated in the EMC directive (Electro Magnetic
Compatibility). These limits are designed to provide reasonable protection against harmful interference from
electrical equipment, but it cannot be guaranteed that interference will never occur.
Read the maintenance section of this document before servicing the product.
Contact L-Acoustics for advanced maintenance.
Any unauthorized maintenance operation will void the product warranty.
Before sending a product to L-Acoustics for maintenance, save all user presets to les using LA Network Manager.
Shipping
Use the original packaging for shipping the product, unless it is mounted in a rack with the front and rear panels
xed to the rack, as described in this manual.
8 LA4X owner's manual (EN) version 14.1

Introduction
Introduction
How to use this manual
The LA4X owner's manual is intended for all actors involved in the system design, implementation, preventive and
corrective maintenance of the LA4X product. It must be used as follows:
1. Read the technical description for an overview of all product elements, their features, and their compatibilities.
•Technical description (p.12)
2. Before installing the product, perform mandatory inspections and functional checks.
•Inspection and preventive maintenance (p.16)
3. To deploy the product, follow the step-by-step installation instructions and refer to the cabling schemes.
•Installation (p.18)
•Audio and network cabling (p.21)
4. To congure the settings and parameters of the product, follow the step-by-step operation instructions.
•Operation (p.27)
The Corrective maintenance (p.61) section contains the operations authorized for the end user.
Performing another operation exposes to hazardous situations.
For advanced maintenance, contact your L-Acoustics representative.
As part of a continuous evolution of techniques and standards, L-Acoustics reserves the right to
change the specications of its products and the content of its documents without prior notice.
Check www.l-acoustics.com on a regular basis to download the latest document and software updates.
Contact information
For information on advanced corrective maintenance:
• contact your Certied Provider or your L-Acoustics representative
• for Certied Providers, contact the L-Acoustics customer service: customer.ser[email protected]
Symbols
The following symbols are used in this document:
This symbol indicates a potential risk of harm to an individual or damage to the product.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation of
the product.
This symbol indicates a potential risk of electrical injury.
It can also notify the user about instructions that must be strictly followed to ensure safe installation or operation of
the product.
This symbol noties the user about instructions that must be strictly followed to ensure proper installation or
operation of the product.
This symbol noties the user about complementary information or optional instructions.
Do not open unless authorized.
This symbol indicates the presence of electrical shock hazards.
It also indicates that no maintenance performed by the end user requires access to internal components.
LA4X owner's manual (EN) version 14.1 9

Introduction
LA4X amplied controller
The LA4X is an amplied controller based on a 4-input by 4-output architecture and an exclusive green power module
providing maximized efciency. With LA4X, L-Acoustics speakers can get all the benets of self-powered speakers, while
keeping the versatility of the separated amplication approach.
The L-Acoustics systems can be operated in three connectivity modes:
"A LA CARTE" The pool of four inputs and four amplication channels of the LA4X can be allocated "à la
carte" to any passive speaker enclosures with a one-to-one-to-one link (input / processing +
amplication / loudspeaker). This approach is cost effective for applications requiring a high
count of independent sound sources such as stage monitors, multi-channel systems and multi-
feed distributed systems.
"FULL ACTIVE" In high-end installation projects, the LA4X can drive active systems, up to K2, for maximum
power headroom and the best possible performances. With one transducer section per output
channel and the independent DSP treatment of each output, this approach brings maximum
discretization with a one-to-one link (processing + amplication / transducer section).
"CONVENTIONAL" For applications requiring a high count of loudspeaker enclosures with optimized cost of
amplication, the LA4X can efciently operate as a conventional amplied controller driving
speakers in parallel from its four amplication channels, with the added benet of the 4 inputs
when using passive loudspeaker enclosures.
10 LA4X owner's manual (EN) version 14.1

System components
System components
Loudspeaker enclosures
Refer to the user documentation of the loudspeaker systems for detailed instructions about the enclosures and their
connection to the amplied controllers.
Powering and driving system
LA4X Amplied controller with DSP, preset library and networking capabilities
Software applications
LA Network Manager Software for remote control and monitoring of amplied controllers
Refer to the Soundvision help.
Refer to the LA Network Manager help.
Illustrations
LA Network Manager L-Case
LA4X owner's manual (EN) version 14.1 11

Technical description
Technical description
Main features
Internal components
The core of the LA4X is a DSP engine driving four channels of amplication from four inputs. The LA4X also features
a ash memory for preset storage and management, high performance A/D-D/A converters and AES/EBU inputs for
audio signals, a universal SMPS (Switched Mode Power Supply) with PFC (Power Factor Correction), a front panel user
interface, and a 1 Gb/s Ethernet dual port.
Front and rear panels
51 2 3 4
6789
10 11 12 13 14 15
011:K2 70 100
LF_A LF_A MF_A HF_A
1status LED
2LED meters: 10 powerCON power supply connector (20 A)
— LIMIT/CLIP level 11 outward ventilation grills
— audio levels (-5 dB, -10 dB and -20 dB) 12 speakON output connectors
— SIGNAL presence 13 XLR analog and AES/EBU input connectors
— LOAD presence 14 XLR analog and AES/EBU link connectors
3L-NET network control LED 15 1 Gb/s etherCON network connectors
42 x 24 characters LCD display
5navigation/edition encoder wheel
6power/standby key and LED
7channel selection keys
8menu keys
9inward ventilation grill and foam lter
12 LA4X owner's manual (EN) version 14.1

Technical description
Signal processing and amplication
Signal inputs
The LA4X features four input connectors allowing it to receive four analog signals, four digital signals, or two analog and
two digital signals, depending on the input mode selected by the user — see section XLR INPUT MODE (p.44). This
architecture also allows digital-to-analog or digital-to-digital fallback.
In addition, four channels may be retrieved from an AVB stream containing up to eight channels at 48 kHz or 96 kHz,
connected by one of the two 1 Gb/s Ethernet ports (on compatible LA4X).
Analog
LA4X can be fed with up to four balanced analog audio signals using XLR female input connectors ANALOG IN A to
ANALOG IN D — see illustration in section Front and rear panels (p.12). Each analog input port is ESD protected.
The analog input panel also features four XLR male link connectors passively wired to the input connectors. The link
connectors allow transmitting the input signals to daisy-chained amplied controllers. Each analog link port is ESD
protected.
To be processed by the DSP, the analog signal must be converted into a digital signal. For this purpose, the LA4X
amplied controller is tted with two cascaded 24-bit A/D converters with a sampling rate of 96 kHz allowing an
encoding dynamic range of 128 dB.
AES/EBU
LA4X can be fed with up to four AES/EBU digital audio signals (transported in pairs) using XLR input connectors AES/
EBU IN A&B and AES/EBU IN C&D.
Each AES/EBU input port is an XLR female connector. The audio signals can come from a digital mixing desk or a
digital audio network bridge compliant with the AES/EBU (AES3) or electrical S/PDIF (IEC 60958 Type II) digital audio
standards. Each AES/EBU input port is ESD protected and transformer balanced.
The AES/EBU input panel also features two XLR male link ports actively connected to the input ports (with failsafe relay
in case of mains absence). The link connectors allow transmitting the input signals to daisy-chained amplied controllers.
Each AES/EBU link port is ESD protected and transformer balanced.
Each AES/EBU input port is equipped with a SRC (Sample Rate Converter) that has been selected to support a wide
range of input formats (16 - 24 bits / 44.1 - 192 kHz). The SRC converts the formats to the 24 bits/96 kHz internal
format used by the amplied controller. The SRC is a high-quality hardware component (140 dB dynamic range,
THD+N<-120dBFS, strong input jitter attenuation) and provides constant propagation delay regardless of the input
sampling frequency.
There is no external synchronization mode. The amplied controller's clock runs using its high-precision internal quartz at
96 kHz (or on the clock of the connected AVB input stream on compatible LA4X). This ensures low jitter and high audio
quality in live conditions (large cable lengths, large number of amplied controllers) while preventing phase shift, as
required for line source systems.
Digital domain benets
Keeping the signal in the digital domain provides the following benets (with any digital mixing desk or any audio
network) compared to the analog signal distribution:
• Better audio quality by removing one D/A - A/D cycle.
• Optimized level chain by removing the risk of level misalignment between console and amplied controllers.
• Digital signal refreshed at each amplied controller in a daisy-chain.
• Improved maximum cable length. LA4X has been tested with up to 305 m/1000 ft of 3 models of AES/EBU rated
cables (single cuts, digital source signal running at Fs = 48 kHz):
• 1696A from BELDEN INC.
• OT234H from KLOTZ communications GmbH.
• SC-BINARY 234 from SOMMER CABLE GmbH.
AVB
• LA4X amplied controllers with HARDWARE INFO ID1, ID2 or ID3 (in MONITORING & INFO menu) do not
support AVB. These Units can be upgraded to support AVB by purchasing and installing KR LA4XDSP2.
LA4X owner's manual (EN) version 14.1 13

Technical description
• LA4X amplied controllers with HARDWARE INFO ID4 or higher (in MONITORING & INFO menu) support AVB.
One AVB stream of up to eight channels may be connected to LA4X. LA4X retrieves up to four channels from this stream.
Each Ethernet port uses a high speed data transfer protocol up to 1 Gb/s and supports the IEC 61883-6 AM824 and
AAF PCM32 stream formats with stream frequencies of 48 kHz or 96 kHz.
The amplied controller synchronizes its audio clock on the clock used by the talker through the incoming stream.
LA4X embeds an AVB bridge and may therefore be used to create an AVB network.
DSP architecture
The proprietary algorithms allow optimum performance and protection of each individual transducer of the L-Acoustics
systems for an even more natural, transparent and realistic sound experience.
• The DSP engine is a 32-bit oating point DSP at 96 kHz sampling rate providing an enhanced dynamic range since
it does not generate calculation clips like a xed point DSP.
• A dedicated engineering approach combining IIR and FIR lters generates perfectly linearized phase curves and
signicantly improved impulse responses.
• The 4 × 4 matrix architecture offers exibility for various system congurations.
• A delay of up to 1000 ms can be set for each output channel.
• The L-DRIVE transducer protection system offers advanced protection by simultaneously monitoring the excursion and
the temperature of the transducer.
• With a complete factory preset library and the possibility to create additional user presets, the ash memory
provides a quick access to all the usual L-Acoustics speaker system congurations (refer to the Preset Guide).
audio path parameters
14 LA4X owner's manual (EN) version 14.1

Technical description
Power supply and amplier section
The Class D amplication circuits ensure the LA4X energy-efciency for minimal heat dissipation. LA4X delivers 4 x
1000WRMS into 8 or 4 Ω with record hold times. Besides the high raw power rating at 8 Ω, the ability to deliver
energy (power x hold time) yields the best performance from loudspeaker systems, especially in LF reproduction.
The LA4X is a green amplied controller that relies on a universal SMPS (Switch Mode Power Supply) suitable for mains
from 100 to 240 V (±10%). The SMPS features a PFC (Power Factor Correction) which maximizes the amplier efciency
and takes advantage of nearly 100% of the electrical power available with a very high tolerance to unstable mains.
The PFC allows the LA4X to deliver as much power from a 10 A line as from a 16 A line on a conventional amp. This
represents a reduction of the electrical power requirements (cable gauge, power conditioning, etc.) for substantial
savings.
Speaker outputs
LA4X features four speakON connectors for loudspeaker outputs.
Speaker protection
The L-DRIVE transducer protection system provides a dual analysis of both signal intensity and voltage in real-time and
RMS. Under extreme conditions, when component membranes reach the over-excursion zone or if the coil temperature
reaches a critical point, L-DRIVE is activated and acts as a power regulator.
As a result, the amount of power delivered at any channel is adjusted to the dynamic and thermal capacity of each
individual transducer.
Monitoring and control
User interface
The front panel user interface provides:
• Real-time monitoring functionalities via the LED display (signals presence and level) and the LCD screen (system
parameters).
• Instant access to navigation and parameters control using the encoder wheel and the six keys.
See also illustration in section Front and rear panels (p.12).
Refer to section Operation (p.27) for detailed operating instructions.
L-NET remote control network
The integration of the L-NET Ethernet-based network, with its high speed data transfer protocol up to 1 Gbit/s, allows up
to 253 amplied controllers to be controlled and monitored in real-time from LA Network Manager.
Multiple network topologies such as daisy-chain, star and hybrid are congurable. The computer running LA Network
Manager and the amplied controllers are connected to each other using industry standard CAT5e U/FTP cables (or
higher category) tted with RJ45 connectors.
The LA4X connects to the network via the two etherCON sockets located on its rear panel.
Refer to the LA Network Manager Help for detailed operating instructions.
Third party management solutions
L-Acoustics provides SNMP support to facilitate the integration via third party control and monitoring systems.
L-Acoustics is a certied member of the Crestron® and Extron® partner programs, and provides software modules allowing
control integration into their automation systems.
L-Acoustics provides a plug-in for control and monitoring of LA4X and LA12X on the QSC Q-SYS platform.
LA4X owner's manual (EN) version 14.1 15

Inspection and preventive maintenance
Inspection and preventive maintenance
How to do preventive maintenance
Inspect the product periodically as indicated, and after any corrective maintenance operation.
Structure and cleanness
Before and after each deployment (touring applications), or at least once a month (xed installations):
•External structure (p.16)
•Cleanness (p.17)
Functionalities
At least once a year:
•Normal start-up sequence (p.17)
•Network functionalities and rmware (p.17)
External structure
The indicates a visual inspection.
side brackets, front handles, and rear
brackets are present and not damaged
encoder wheel, and grill and foam
lter are present and not damaged
see also Cleanness (p.17)
chassis, Lexan plate, LCD screen,
and LEDs are not damaged
connectors are not damaged
16 LA4X owner's manual (EN) version 14.1

Inspection and preventive maintenance
Cleanness
Equipment
• air blower
Procedure
1. Disassemble the grill to clean the foam lter.
Refer to the Grill and foam lter (p.69) procedure.
Do not touch any part inside the amplied controller.
2. Clean the amplied controller through the front grill with an air blower.
3. Reassemble the foam lter and the grill.
Normal start-up sequence
Procedure
1. Plug the amplied controller to mains.
2. Power on the amplied controller.
3. Check that the LCD screen and all the LEDs lit during the start-up sequence.
Network functionalities and rmware
Equipment
• computer with LA Network Manager and CAT5e U/FTP cable
Procedure
1. Connect the controller to an Ethernet port of a computer running LA Network Manager.
Use the CAT5e U/FTP cable.
2. Run LA Network Manager.
3. Check that the amplied controller is detected as an online Unit.
Refer to the LA Network Manager Help.
4. Check that all LA4X in the system run the same version of the rmware, and that it matches with the version of LA
Network Manager in use.
Refer to the LA NWM and Firmware Compatibility Issues technical bulletin.
5. If convenient, update LA Network Manager and the rmware to the latest versions.
If using a third-party control system such as Crestron or Extron, check that updating rmware does not break
compatibility.
LA4X owner's manual (EN) version 14.1 17

Installation
Installation
Mounting
The LA4X is two rack units high (2U) and can be mounted in an EIA-standard 19” rack using the four points on the front
panel. Use the xing material provided by the rack manufacturer to mount the controller to the rack front rails.
LA4X dimensions
76 mm / 3 in
465 mm / 18.3 in
LA 4X
SERIAL N° 1001
MAINS:
90 - 265 VAC / 50-60Hz / 1500W
ANALOG IN B
LINK B
L-NET
LINK/ACT
LINK/ACT
AES/EBU IN C&D
LINK C&D
AES/EBU IN A&B
LINK A&B
ANALOG IN C
LINK C
ANALOG IN A
LINK A
ANALOG IN D
LINK D
OUT 2 OUT 3 OUT 4OUT 1
1+1- 2+ 2- 1+1- 2+ 2-
1+1- 1+1-
OUT 2 OUT 4
88 mm / 3.5 in
483 mm / 19 in 406 mm / 16 in
420 mm / 16.5 in
16 mm / 0.63 in
398 mm / 15.7 in
434 mm / 17 in
Risk of damaging the amplied controller during transport
During transport or while on tour the amplied controller should be rear supported in addition to the front panel
mounting.
Use the rear brackets provided with the amplied controller.
Any mechanical damage to the amplied controller used in portable applications without rear support is not
covered by warranty.
LA4X with rear rack support brackets
400 mm / 15.7 in.
max. 486 mm / 19.1 in.
18 LA4X owner's manual (EN) version 14.1

Installation
Ventilation
To maintain moderate operating temperatures, the LA4X is equipped with two fans providing front to rear airow.
Ventilation instructions
Install the controller in an open area so that the front and rear panels are located at a minimum distance of 30 cm
from any external object or structure.
Ensure the front foam lter is clean and dirt free.
Do not block the front and rear ventilation grills.
Ventilation when rack-mounted
Do not block the ventilation grills with front or back panels or doors. If not possible, use a forced-ventilation
system.
When stacking more than one controller in a rack, mount them directly on top of each other or close any open
space in the rack with blank panels.
Connecting to AC mains
Electrical specications
AC mains specications
Verify the electrical conformity and compatibility of the mains supply.
Only connect the product to an AC power outlet rated 100-240 V, 50-60 Hz, with the following current values:
100-120 V: 20 A
200-240 V: 10 A
WARNING: The product is of CLASS 1 construction and shall be connected to a mains socket outlet with a
protective connection to earth.
Three-phase circuit
When the product is used in a three-phase circuit, verify the electrical conformity and
compatibility of the three-phase circuit.
Verify that the three phases work, and balance the loads between the three phases.
Verify that the neutral and earth work.
Never try to emulate a 230 V circuit connecting an apparatus to two live wires of a 120 V three-phase circuit.
Never try to emulate a 200 V circuit connecting an apparatus to two live wires of a 100 V three-phase circuit.
Circuit breaker
Always interconnect a Class C circuit breaker between the product and the mains supply.
The circuit breaker current rating depends on the mains voltage rating, as follows:
100-120 V: 20 A
200-240 V: 10 A
LA4X owner's manual (EN) version 14.1 19

Installation
Planning the power of the electrical generator
Electrical generator
You must power on the generator before powering on the product.
Verify that the product is turned off before powering on the generator.
LA4X draws 10 A max from 230 V.
A typical generator has a power factor of 0.8 and should operate at 70% load for good efciency.
The kVA provision for one LA4X should therefore be:
(10 A x 230 V) / (0.8 x 70%) = 4.1 kVA
This calculation is an example using typical values. It can be adapted using the table in section Power consumption
(p.21).
Power cord
The removable power cord is tted at one end with a 20 A powerCON connector.
The other end and the wires color code depends on the cord type, as follows:
type plug live neutral ground
CE
CN
CEE 7/7, 16 A / 250 V, grounded
GB1002 GB2099, 16 A brown blue green/yellow
US NEMA 5-15, 15 A / 125 V grounded black white green
INT bare ends (local power plug to be tted) black white green/yellow
Strictly apply the specic safety regulations of the country of use.
Do not defeat the ground connection of the supplied power cord using an adaptor or any other methods.
A suitable plug must be wired to the INT power cord.
Verify that the plug conforms to the specic voltage and current rating given in section Electrical specications
(p.19).
Plugging the amplied controller
How to plug the amplied controller to the AC mains.
Procedure
— First, connect the powerCON to the amplied controller mains panel.
— Then, connect the power plug to the mains socket.
Following this order improves the powerCON longevity.
20 LA4X owner's manual (EN) version 14.1