L-Acoustics LA4 User manual

LA
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4 AMPLIFIED CONTROLLER
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CONTROLEUR AMPLIFIE
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1SAFETY WARN NGS
SAFETY WARN NGSSAFETY WARN NGS
SAFETY WARN NGS
All information hereafter detailed applies for the L-ACOUSTICS® LA4 Amplified Controller, designated in this
section as ‘‘the product’’.
1.1 S mbol description
1.1.1 S mbols emplo ed in this manual
Throughout this manual the potential risks are indicated by the following symbols:
The VOLTAGE symbol indicates a potential risk of electric shock that could be life threatening.
n addition, the product may also be seriously damaged.
The WARN NG symbol indicates a potential risk of physical harm to the user or people within close
proximity to the product.
n addition, the product may also be damaged.
The CAUT ON symbol notifies the user about information to prevent possible product damage.
The MPORTANT symbol is a notification of an important recommendation of use.
1.1.2 S mbols indicated on the product
As the product is an electrical device, it represents potential hazard for the user. For this reason the user may pay
particular attention to the symbols that are indicated on the product’s cover:
The lightning flashes symbols next to the 4-point Speakon® connector sockets indicates that the
product can produce high output voltages that are potentially life threatening.
Connections between the product and a speaker should always be done with an all ready-made lead.
Never attempt to touch any exposed speaker wiring whilst the amplifier is operating without
disconnecting the connector first from the product.
!
CAUTION
R SK OF ELECTR C SHOCK
DO NOT OPEN
WARNING:
RISK OF HAZARDOUS ENERGY
SEE OPERATING MANUAL
CLASS 2 PERMITTED
!
MPORTANT
!
CAUT ON
!
WARN NG
VOLTAGE

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1.2 Important safet instructions
1. Read this manual
2. Heed all safet warnings
3. Follow all instructions
4. The user should never incorporate equipment or accessories not approved b L-ACOUSTICS®
5. Environments
Use the product only in E1, E2, E3, or E4 environments according to EN55103-2 standard.
6. Radio interference
A sample of this product has been tested and complies with the limits for the EMC (European Electro
Magnetic Compatibility) directive.
These limits are designed to provide reasonable protection against harmful interference from electrical
equipment. However, there is no guarantee that interference will not occur in a particular installation.
7. Power cord caution
Do not use the product if the power cord is broken or frayed.
Protect the power cord from being walked upon or pinched - particularly at the plugs and the point
where the power cord exits from the apparatus.
8. Mains suppl
Connect the product only to AC power outlets rated 120 / 230 V, 50 - 60 Hz.
A specific 100 V, 50 - 60 Hz version exists for Japan.
NEVER connect the product to two live wires of a 120 V three-phase circuit (in order to use it in the
230 V mode).
9. Thermal circuit breaker
ALWAYS interconnect a thermal circuit breaker between the product and the mains supply.
The circuit breaker current rating depends on the mains voltage rating as follows:
16 A for 230 V, 30 A for 120 V, and 36 A for 100 V.
10. Grounding
The product may only be connected to a mains power supply fitted with a grounding-type outlet tied
to earth; do not defeat the outlet earth pin as it connects the product to earth. f the local outlet is
obsolete, consult an electrician. The product is fitted with a grounding-type plug; do not defeat the
earth wire connecting the plug female contact to the product chassis. f the plug does not mate with
the local outlet, replace the plug by following the convention described in section 6.3.3.
11. Lightning storm
During lightning storms, disconnect the product from the mains power supply.
Switching the product off does not disconnect the product from the mains power supply.
Disconnecting can only be achieved by removing the plug from the mains outlet.
VOLTAGE
VOLTAGE
VOLTAGE
VOLTAGE
VOLTAGE
!
MPORTANT
!
MPORTANT

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12. Interconnections
When connecting the product to other equipment, turn off the power and unplug all of the equipment
from the supply source. Failure to do so may cause an electric shock and serious personal injury.
Read the user manual of the other equipment carefully and follow the instructions when making the
connections.
Do not connect a speaker output in parallel or series with any other amplifier’s output.
Do not connect the speaker outputs to any other voltage source, such as a battery, mains source, or
power supply, regardless of whether the product is turned on or off.
13. Over power risks
The product is very powerful and can be potentially dangerous to both loudspeakers and humans alike.
Even when using the product’s front panel attenuator to reduce the gain, it is still possible to reach full
output power if the input signal level is high enough.
14. Ventilation
Openings in the product cabinet are provided for ventilation to ensure reliable operation of the
product by protecting it from overheating.
These openings must not be blocked or covered.
This product should be installed in accordance with the manufacturer instructions given in this manual.
15. Heat
Do not operate the product near any heat source, such as radiators or other devices.
16. Water and moisture
To prevent fire or shock hazard, do not expose the product to rain or moisture.
Do not use the product near water.
Do not operate the product while wet.
17. Interference with external objects and/or liquids
Never push objects of any kind into the product through openings as they may touch dangerous
voltage points or short out parts that could result in a fire or electric shock.
Never spill liquid of any kind on the product.
18. Cleaning
Unplug the product from the mains power supply before cleaning.
Do not use liquid or aerosol cleaners.
Clean only with dry cloth.
19. 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 instructions, and should use the
mounting accessories recommended by the manufacturer, as described in this manual.
VOLTAGE
VOLTAGE
VOLTAGE
!
CAUT ON
!
CAUT ON
!
CAUT ON
!
CAUT ON
!
WARN NG

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20. Conditions which require immediate service
Refer all servicing to qualified service personnel.
Servicing is required when the product has been damaged in any way such as:
•Power supply cord or plug is damaged,
•Liquid has been spilled or an object has fallen into the product,
•The product has been exposed to rain or moisture,
•The product was dropped or the housing is damaged,
•The product does not operate normally.
21. Servicing and replacement parts
Do not attempt to service this product as removing covers may expose to dangerous voltage or other hazards.
The use of unauthorized replacement parts may result in injury and/or damage through fire, electric
shock, or other electricity-related hazards.
All service and repair work must be carried out by an L-ACOUST CS®authorized dealer.
When replacement parts are required, ensure that the dealer/distributor only uses replacement parts
specified by the manufacturer.
22. Shipping
Use the original packaging for shipping the product, unless it is mounted in a rack with the front and
rear panels fixed to the rack, as described in this manual.
23. 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.
VOLTAGE
!
MPORTANT
!
CAUT ON
!
CAUT ON

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1.3 EC declaration of conformit
L-ACOUST CS®
13 rue Levacher Cintrat
Parc de la Fontaine de Jouvence
91462 Marcoussis Cedex
France
State that the following product:
Amplified Controller, LA4
s in conformity with the provisions of:
Low Voltage Electrical Equipment Directive 73/23/EC
Electro-Magnetic Compatibility Directive 89/336/EC
Applied rules and standards:
EN60065 (Electrical safety)
EN55103-1 (Emission)
EN55103-2 ( mmunity)
Established at Marcoussis, France, the 06/21/2007
Christophe Pignon

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2CONTENTS
CONTENTSCONTENTS
CONTENTS
1 SAFETY WARNINGS 1
1.1 Symbol description ............................................................................................................................................1
1.1.1 Symbols employed in this manual........................................................................................................1
1.1.2 Symbols indicated on the product .......................................................................................................1
1.2 mportant safety instructions..............................................................................................................................2
1.3 EC declaration of conformity .............................................................................................................................5
2 CONTENTS 6
3 INTRODUCTION 8
3.1 Welcome to L-ACOUST CS®............................................................................................................................8
3.2 Unpacking .........................................................................................................................................................8
4 SYSTEM APPROACH 9
4.1 Presentation......................................................................................................................................................9
4.2 System configurations........................................................................................................................................9
5 LA4 AMPLIFIED CONTROLLER 11
5.1 Front and rear panels.......................................................................................................................................11
5.2 Main features...................................................................................................................................................12
5.2.1 Simplified block diagram ...................................................................................................................12
5.2.2 DSP Architecture..............................................................................................................................12
5.2.3 A/D Converters................................................................................................................................13
5.2.4 Amplifier section...............................................................................................................................13
5.2.5 User interface...................................................................................................................................14
5.2.6 L-NET Remote Control Network.....................................................................................................14
5.2.7 Digital Audio Network......................................................................................................................14
5.2.8 LA NETWORK MANAGER PC Software..........................................................................................14
6 INSTALLATION 15
6.1 Mounting.........................................................................................................................................................15
6.2 Cooling............................................................................................................................................................16
6.3 Connecting to AC mains..................................................................................................................................16
6.3.1 Operating voltage.............................................................................................................................16
6.3.2 Circuit breaker .................................................................................................................................16
6.3.3 Power plug and wiring ......................................................................................................................16
6.4 On/Off Switch .................................................................................................................................................17
6.5 Wiring .............................................................................................................................................................18
6.5.1 XLR input connectors.......................................................................................................................18
6.5.2 Speakon® output connectors ............................................................................................................19
6.5.3 L-NET Wiring...................................................................................................................................20
6.6 Power consumption ........................................................................................................................................20
6.7 Heat power calculation....................................................................................................................................20
7 OPERATION 21
7.1 Quick access....................................................................................................................................................21
7.1.1 Output channel Mute control............................................................................................................21
7.1.2 nput & Output Gain control.............................................................................................................22
7.1.3 Front panel Lock / Unlock control.....................................................................................................22
7.2 Main Screen.....................................................................................................................................................22
7.3 User interface menu ........................................................................................................................................24
7.3.1 ntroduction......................................................................................................................................24
7.3.2 LOAD PRESET (user: 1 to 10, manufacturer: 11 to 99) .....................................................................25
7.3.3 STORE PRESET (User memories 1 to 10).........................................................................................26
7.3.4 DELETE PRESET (User memories 1 to 10).......................................................................................27
7.3.5 PRESET PARAMETERS.....................................................................................................................28

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7.3.6 CLEAR GROUP PARAMETERS ........................................................................................................29
7.3.7 OPT ONS ........................................................................................................................................30
7.4 On screen messages ........................................................................................................................................33
7.4.1 Start-up sequence.............................................................................................................................33
7.4.2 Shut-down sequence ........................................................................................................................33
7.4.3 nformation.......................................................................................................................................33
7.4.4 Malfunctions .....................................................................................................................................34
7.5 LED display .....................................................................................................................................................35
7.5.1 Output signal display.........................................................................................................................35
7.5.2 L-NET LED ......................................................................................................................................35
7.5.3 Routing and input signal display .........................................................................................................36
7.6 Amplified controller protection systems...........................................................................................................37
7.6.1 Thermal Protection ..........................................................................................................................37
7.6.2 Mean Over-Current Protection - Fuse Protection.............................................................................37
7.6.3 DC Protection..................................................................................................................................37
7.6.4 Mains supply Under & Over-voltage Detection .................................................................................37
7.6.5 Mains supply Failure Detection .........................................................................................................37
7.6.6 Peak Over-Current Protection .........................................................................................................37
7.6.7 DSP & Operating system Error.........................................................................................................37
7.7 L-DR VE: transducer protection system ...........................................................................................................38
8 CARE AND MAINTENANCE 39
8.1 Maintenance information .................................................................................................................................39
8.2 Filter cleaning..................................................................................................................................................39
8.3 Troubleshooting..............................................................................................................................................40
8.3.1 No power, no sound, or sound level too low ....................................................................................41
8.3.2 Poor sound quality............................................................................................................................42
8.3.3 Overheating .....................................................................................................................................42
9 SPECIFICATIONS 43

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3.1 Welcome to L-ACOUSTICS®
Thank you for purchasing the L-ACOUSTICS® LA4 Amplified Controller.
This manual contains essential information on installing and operating the product correctly and safely. 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 @ www.l-acoustics.com on a regular basis for latest updates.
Should the product require repair or if information about the warranty is needed, please contact an approved
L-ACOUST CS® distributor. The address of the nearest distributor is available on the L-ACOUST CS® web site.
3.2 Unpacking
Carefully open the shipping carton and check the product for any noticeable damage. Each L-ACOUST CS® product is
tested and inspected before leaving the factory and should arrive in perfect condition.
f found to be damaged, notify the shipping company or the distributor immediately. Only the consignee may initiate a
claim with the carrier for damage incurred during shipping. Be sure to save the carton and packing materials for the
carrier's inspection.
The LA4 package comprises one L-ACOUSTICS® LA4 amplified controller and two rear rack support brackets,
as shown in Figure 1:
Figure 1: The LA4 amplified controller and its two rear rack support brackets

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4SYSTEM
SYSTEM SYSTEM
SYSTEM APPROACH
APPROACHAPPROACH
APPROACH
4.1 Presentation
The L-ACOUSTICS® LA4 Amplified Controller is at the heart of the L-ACOUST CS® integrated system approach.
t offers cutting edge loudspeaker amplification, DSP, network control, and comprehensive system protection in a single
ergonomic package. The LA4 performance level fully optimizes all L-ACOUST CS® speaker resources and delivers
outstanding audio quality combined with the best possible transducer protection.
All L-ACOUST CS® loudspeaker systems will now benefit from the advanced and exclusive properties of the LA4 and
LA8 control platforms. As a result of the integrated approach all L-ACOUST CS® loudspeaker systems will be enhanced
by the superior performance of high end electronic platforms, allowing perfect power matching combinations across
the entire product range.
Packaged in a compact 2U lightweight format chassis the LA4 platform has the following characteristics:
•A 4 channel high efficiency amplifier section fed by two inputs that can deliver up to 4 x 1000 Watts
into 4 ohms yielding perfect power matching for a selected range of L-ACOUST CS® speakers.
•A DSP section featuring advanced filter algorithms ( R and F R) and an exclusive L-DR VE protection
system for the transducers, allowing optimum system performance.
•A complete on board preset library stored in 89 memory locations to cover all principal
loudspeaker system configurations for a selected speaker range, and 10 user memory locations.
•An intuitive and ergonomic user interface plus display for all configuration settings and status
information all fully accessible from the front panel.
•Two /O Ethernet ports to interconnect up to 253 units in multiple network topologies through the
L-ACOUST CS® L-NET network. n this case the controllers can be remotely monitored by the PC-
based LA NETWORK MANAGER software (Windows® compatible).
•Four 4-point Speakon® connectors for loudspeaker outputs.
•A rear-panel plug-in card slot also allowing the LA4 to be ready for multi-channel digital audio
networking implementation (this option will be available as a future development).
4.2 S stem configurations
Driving four amplifier output channels through a DSP offers a wide range of options when it comes to system
configuration possibilities. The LA4 and LA8 onboard DSP preset libraries allow the Sound Engineer a high degree of
flexibility through the use of the 6 following system template configurations:
•4 Way active mono system
•2 Channel stereo system (for subwoofers or passive enclosures)
•2 Way active stereo system
•Hybrid mono system (for subwoofers and active enclosures)
•Hybrid stereo system (for subwoofers and passive enclosures)
•Cardioid mono subwoofer system
Note: The LA4 and LA8 preset description sheets are available in the “Preset Libraries - User Manual” on the
L-ACOUST CS® web site @ www.l-acoustics.com.

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The LA4 onboard factory preset library covers L-ACOUST CS® loudspeaker systems that require up to 800 Watts into
8 ohms or 1000 Watts into 4 ohms.
The system approach developed by L-ACOUST CS® consists of the elements needed to fully optimize the possible
configurations. The main products associated to the LA4 are the following (see also Figure 2):
8XT, 12XT  XT range coaxial enclosures
KIVA, ARCS
®
 2-way WST
®
systems
KILO  Subwoofer extensions for K VA
SB118  Subwoofer enclosure
LA NETWORK MANAGER  Remote control software
Figure 2: LA4 and associated s stems
LA NETWORK MANAGER
KI
VA
8XT
12XT
KILO
ARCS
SB118
ETHERNET SWITCH
(not provided)
LA4

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5.1 Front and rear panels
Figure 3: LA4 amplified controller front & rear panels
1 On/Off Switch
2 Anti-Dust Cover
3 Input selection + Menu ke s
4 Output selection ke s
5 LOAD led
Signal Presence led
Level and CLIP bargraph LED
6 L-NET Network Control led
7 LCD screen
8 Nav/Edit Encoder wheel
9 XLR Input Link connector
10 XLR Input connector
11 RJ45 L-NET Network sockets
12 Digital Audio Network socket
(available as a future development)
13 Speakon® Output connectors
14 Fan Grill
15 AC power cord

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5.2 Main features
5.2.1 Simplified block diagram
The LA4 combines in a 2U lightweight chassis the resources of a 2 N / 4 OUT DSP engine driving four channels of
amplification, a flash memory for preset storage and management, a front panel user interface, a Fast Ethernet device
for network remote control, high performance A/D-D/A converters for audio signals, and an optional digital audio card
(this option will be available as a future development).
The administration of the LA4 resources is performed by an embedded Operating System (Linux) while the auto-
sensing SMPS (Switched Mode Power Supplies) allows weight and size reduction.
Figure 4: LA4 simplified block diagram
5.2.2 DSP Architecture
The new proprietary algorithms are allowing optimum performance and protection of each individual transducer of the
L-ACOUST CS® system in use for an even more natural, transparent, and realistic sound experience.
•The engine is a SHARC 32 bit floating point DSP at 96 kHz sampling rate that offers an enhanced dynamic
range by not generating calculation clips like other fixed point DSP.
•A special engineering approach combining R and F R filters generates a perfect linearization of phase curves
and therefore a significant improvement of the system impulse response.
•The 2 x 4 matrix architecture offers flexibility for various system configurations.
•The L-DR VE transducer protection system offers advanced protection by monitoring both excursion and
temperature of the transducer (see section 7.7).
•With 89 factory presets and 10 user memory locations the engineer is offered fingertip access to all the usual
L-ACOUST CS® speaker system configurations (see the “Preset Libraries - User Manual”).

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Figure 5: DSP Architecture
5.2.3 A/D Converters
The LA4 amplified controller is fitted with two cascaded 24 bit A/D converters with a sampling rate of 96 kHz allowing
a ground-breaking encoding dynamic of 130 dB.
5.2.4 Amplifier section
The LA4 amplifier section uses a Class H technology supporting the wide dynamic range encountered in live audio
productions. The 4 channels can deliver up to 4 x 1000 Watts into 4 ohms yielding perfect power matching for a
selected range of L-ACOUST CS® speakers.
The auto-sensing SMPS (Switched Mode Power Supply) offers better stability by associating two symmetrical power
supplies. The power supply architecture optimizes the power resources distribution with respect to each amplifier
output channel requirements.
2 x 4
MATRIX
Arra
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5.2.5 User interface
The front panel user interface features quick access functions for the 2 inputs and 4 outputs. The encoder wheel gives
instant access to the user menus and the LCD display offers real time visualization of the system parameters.
Navigation through the menu pages is fast and intuitive. Beside the standard on board factory preset library the
engineer can design and store his own settings (initialized from a standard preset template) in one of the 10 available
user memory locations (see Chapter 7).
5.2.6 L-NET Remote Control Network
The proprietary L-NET network uses a high speed data transfer of 100 Mbit/sec for real time monitoring and control of
each individual LA controller within a network of up to 253 units. Multiple network topologies such as daisy-chain, star,
and hybrid are quickly and easily configurable with total flexibility in achieving the required system architecture. The
physical connection between the PC and the controllers is managed with CAT5e U/FTP cable (or higher category) and
the /O Ethernet sockets located on the rear panel of the controller require industry standard RJ45 connectors. The use
of a universal Ethernet switch is recommended for specific network topologies.
Note: Please refer to the ‘‘LA NETWORK MANAGER - User Manual’’ for detailed operating instructions.
5.2.7 Digital Audio Network
A slot located on the rear panel is designed to accept an optional L-DGA card (digital audio network). The slot is for the
provision of an additional digital input module consisting of a 64 audio channel bus plus one extra channel dedicated to
remote control and monitoring. The extremely low and predictable latency of this technology combined with proven
real world reliability delivers stable and predictable results in all sound reinforcement applications. The L-DGA card is
also for cascading several LA4 (and LA8) using the same type of cable as for the L-NET remote control network.
The signal routing on the digital audio bus into any LA controller can be operated from the LA NETWORK MANAGER
software.
This option will be available as a future development.
5.2.8 LA NETWORK MANAGER PC Software
L-ACOUSTICS® LA NETWORK MANAGER provides network control and monitoring of both LA4 and LA8
controllers from a PC Windows®-operating system. The multiple window display gives an overall visualization of the
network status, number and groups of controllers, and all the information related to the control and monitoring of the
networked controllers.
Real-time access to all settings such as Preset, Mute/Solo, Gain, Delay, Polarity, and Matrix can be done using the
remote software interface. A contour EQ system is also available for quick and easy loudspeaker system frequency
response setting. n particular, the original Array Morphing tool is dedicated to line source array systems.
LA NETWORK MANAGER also features system stand-by and initialization control in addition to comprehensive visual
monitoring of the audio signal paths and quick detection of any faults in the attached network.
Note: Please refer to the ‘‘LA NETWORK MANAGER - User Manual’’ for detailed operating instructions.
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6.1 Mounting
The LA4 is two rack units high (2U) that can be mounted in an E A-standard 19’’ rack (Figure 6). Four mount points are
provided on the controller front panel for rack mounting. Use four screws and washers when mounting the controller
to the front rack rails.
Figure 6: Controller dimensions
During transport or while on tour it is essential that the LA4 controllers are rear supported in
addition to the front panel mounting. Use the rear rack support brackets provided with the
controller as described in Figure 7.
Any mechanical damage to LA4 controllers used in portable applications without rear support will
not be covered by warranty.
Figure 7: Controller and rear rack support brackets
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6.2 Cooling
The amplified controller uses a forced air cooling system to maintain a low and even operating temperature.
All fan cooled L-ACOUST CS® amplified controllers have front to rear airflow. Therefore when stacking more than one
unit in a rack, mount units directly on top of each other or close any open space in the rack with blank panels.
f the controller is rack-mounted do not block front or rear air vents with front or back panels or
doors. f this cannot be achieved a forced ventilation system has to be used.
f the controller is installed in an enclosed rack the open area at the back of the controller must be
at least 140 cm3 per controller.
Ensure that the front filter system is clean and dust free (see section 8.2).
6.3 Connecting to AC mains
6.3.1 Operating voltage
Operating voltage range and frequency are indicated on the controller back panel.
Only connect the controller to an appropriate AC circuit and outlet.
f you are unsure of the output voltage of your AC mains please consult your local electrician.
The following table gives the LA4 Power Supply Data in nominal use (4 Ω, 1/8 of maximum output power [see section 6.6]):
Table 1: LA4 Power suppl data in nominal use
Voltage (V) Mains Frequency (Hz) Current (A) Power Consumption (W)
100 50 - 60 26 1600
120 / 230 * 50 - 60 22 / 12 1600
* f the mains voltage value is more than 145 V the amplified controller will automatically start in the 230 V mode. On the contrary case the amplified
controller will automatically start in the 120 V mode.
6.3.2 Circuit breaker
ALWAYS interconnect a thermal circuit breaker between the product and the mains supply.
The circuit breaker current rating depends on the mains voltage rating as follows:
16 A for 230 V, 30 A for 120 V, and 36 A for 100 V.
6.3.3 Power plug and wiring
The amplified controller is supplied either with a European, US, or Japanese AC power plug depending on the country of
use. f the power plug is not appropriate it can be cut off and wired to a suitable plug in the following manner:
Table 2: Power cord wiring color code
Countr Live Neutral Earth
Europe Brown Blue Green / Yellow
USA Black White Green
Japan Black White Green
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Changing the plug must be done by qualified personnel only.
The specific safety regulations of the country of use must be strictly applied.
The plug must be approved for the specific voltage and current rating given in Table 1.
The ground connection of the supplied AC power cord is a safety feature. Do not attempt to disable
it by using an adaptor or by other methods.
NEVER connect an amplified controller to two live wires of a 120 V three-phase circuit (in order to
use it in the 230 V mode).
Note: Warranty will not cover damages caused by a wiring error.
6.4 On/Off Switch
When the controller is switched on (Figure 8) a 20 seconds start-up procedure of internal tests is activated,
as described in section 7.4.1. The controller is ready for use when the LCD displays the main screen (see section 7.2).
When the amplified controller is switched Off the LCD flashes the ‘‘POWER OFF’’ and “WA T NG SMPS” messages for
several seconds until complete shut down (see section 7.4.2).
Notes: n case of power loss the controller will restart automatically once the power has been restored, and reboot to
the exact same state prior to power loss.
The ‘‘Standby Mode’’ message (and the four LOAD LED lit [see section 7.5.1]) indicates that the controller has been
put in the Standby Mode via the LA NETWORK MANAGER software. This standby status prevents any front panel
control and operating. To cancel the Standby Mode and LA NETWORK MANAGER exclusive control, reboot the unit
by switching it off and on again.
The On/Off switch does NOT disconnect the amplified controller from mains.
Figure 8: The On/Off switch
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6.5 Wiring
6.5.1 XLR input connectors
Two 3 pin male XLR input connectors are provided for channel A & B respectively as well as two 3 pin female XLR
input link connectors wired in parallel on channel A & B (see Figure 9).
XLR nput connectors are active balanced and wired according to EC 268 as below:
Pin 1  Ground (Shield)
Pin 2  Hot (pos. signal)
Pin 3  Cold (neg. signal)
Figure 9: Input XLR connectors cabling
The input impedance is high enough (22 kΩ, balanced) to allow daisy-chaining or multiple parallel input connections.
To daisy chain amplified controllers use the male XLR connector (‘‘Link’’) to feed the input signal to the next unit in the
signal chain.
The headroom of the input circuits is high enough to accept the maximum output level from virtually any line level signal
source (up to 22 dBu).
Note: Symmetrical (balanced) shielded cables are highly recommended as balanced signals are less sensitive to AC hum
and radio interference. Unbalanced lines may result in noise especially over long cable runs.