L-Acoustics LA4 User manual

LA4 AMPLIFIED CONTROLLER
LA4 CONTROLEUR AMPLIFIE
VERSION 1.1
www.l-acoustics.com
EN
F
R
USER MANUAL
MANUEL UTILISATEU
R

www.l-acoustics.com

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EN
1SAFETY WARNINGS
All information hereafter detailed applies for the L-ACOUSTICS®LA4 Amplified Controller, designated in this
section as ‘‘the product’’.
1.1 Symbol Description
1.1.1 Symbols employed 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
and/or seriously damage the product.
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 information to the user which can prevent possibly damaging the
product.
The IMPORTANT symbol notifies an important recommendation of use.
1.1.2 Symbols 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 NL4FC Speakon connector sockets indicates that the
product can produce high output voltages that can potentially be 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 Speakon connector first from the product.
!
CAUTION
RISK OF ELECTRIC SHOCK
D
O
N
O
T
O
PEN
W
ARNING:
RISK OF HAZARDOUS ENERGY
SEE OPERATING MANUAL
CLASS 2 PERMITTED
!
IMP
O
RTANT
!
CAUTION
!
WARNING
V
OLTAGE

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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. 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 supply
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.
9. Grounding
The product may only be connected to mains power supplies tied to ground.
Always operate the product with the chassis ground wire connected to the electrical safety earth of
the mains supply outlet. Do not defeat the safety purpose of the grounding-type plug. A grounding-
type plug has two pins and a third grounding prong. The third prong is a safety feature. If the provided
plug does not fit into the local outlet, consult an electrician for replacement of the obsolete outlet.
10. 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. Therefore,
disconnecting can only be achieved by removing the plug from the mains outlet.
VOLTAGE
VOLTAGE
VOLTAGE
VOLTAGE
!
IMPORTANT
!
IMPORTANT

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11. 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.
12. 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.
13. Ventilation
Openings in the product’s 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.
14. Heat
Do not operate the product near any heat source, such as radiators or other devices.
15. 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.
16. 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.
17. Cleaning
Unplug the product from the mains power supply before cleaning.
Do not use liquid or aerosol cleaners.
Clean only with dry cloth.
18. Mounting instructions
Do not place the product on an unstable cart, stand, tripod, bracket, or table. The product may fall,
causing damages or serious injuries. Any mounting of the product should follow the manufacturer’s
instructions, and should use the mounting accessories recommended by the manufacturer, as
described in this manual.
VOLTAGE
VOLTAGE
VOLTAGE
!
CAUTION
!
CAUTION
!
CAUTION
!
CAUTION
!
WARNING

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19. Causes that 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.
20. 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-ACOUSTICS authorised dealer. When
replacement parts are required, ensure that the dealer/distributor only uses replacement parts
specified by the manufacturer.
21. 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.
22. Manual
Keep this manual in a safe place during the lifetime of the product. 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
!
CAUTION
!
IMPORTANT
!
CAUTION

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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
State that the following product:
Amplified Controller, LA4
Are in conformity with the provisions of:
EN60065 (Electrical safety)
EN55103-1 (Emission)
EN55103-2 (Immunity)
Applied rules and standards:
Electro-magnetic compatibility 89/336/EEC
Low voltage electrical equipment 73/23/EEC
Established at Marcoussis, France, the 06/21/2007
Christophe Pignon

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2CONTENTS
1SAFETY 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 Important safety instructions................................................................................................................................... 2
1.3 EC declaration of conformity .................................................................................................................................. 5
2CONTENTS 6
3INTRODUCTION 8
3.1 Welcome to L-ACOUSTICS ................................................................................................................................... 8
3.2 Unpacking................................................................................................................................................................ 8
4SYSTEM CONCEPT 9
4.1 Presentation............................................................................................................................................................. 9
4.2 System Configurations............................................................................................................................................. 9
5LA4 AMPLIFIED CONTROLLER 11
5.1 Front and rear panel.............................................................................................................................................. 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
6INSTALLATION 15
6.1 Mounting................................................................................................................................................................ 15
6.2 Cooling .................................................................................................................................................................. 16
6.3 Operating voltage.................................................................................................................................................. 16
6.4 Connecting to AC mains........................................................................................................................................ 16
6.5 On/Off Switch........................................................................................................................................................ 17
6.6 Wiring .................................................................................................................................................................... 18
6.6.1 XLR input connectors............................................................................................................................ 18
6.6.2 SPEAKON output connectors ............................................................................................................... 19
6.6.3 L-NET Wiring......................................................................................................................................... 20
6.7 Power consumption .............................................................................................................................................. 20
6.8 Heat power calculation.......................................................................................................................................... 20
7OPERATION 21
7.1 Quick access.......................................................................................................................................................... 21
7.1.1 Output channel Mute control ................................................................................................................ 21
7.1.2 Input & 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 Introduction ........................................................................................................................................... 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
7.3.6 CLEAR GROUP PARAMETERS............................................................................................................. 29
7.3.7 OPTIONS .............................................................................................................................................. 30

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7.4 On screen messages.............................................................................................................................................. 33
7.4.1 Start-up sequence .................................................................................................................................. 33
7.4.2 Warning messages.................................................................................................................................. 33
7.5 LED display............................................................................................................................................................ 34
7.5.1 Bargraph display..................................................................................................................................... 34
7.5.2 L-NET LED............................................................................................................................................ 34
7.5.3 Routing and input signal display.............................................................................................................. 35
7.6 Amplified controller protection systems ............................................................................................................... 36
7.6.1 Thermal Protection................................................................................................................................ 36
7.6.2 DC Protection........................................................................................................................................ 36
7.6.3 Mains supply Under & Over-voltage Detection.....................................................................................36
7.6.4 Mains supply Failure Detection.............................................................................................................. 36
7.6.5 Peak Over-Current Protection.............................................................................................................. 36
7.6.6 Mean Over-Current Protection - Fuse Protection................................................................................ 36
7.6.7 DSP & Operating system Error.............................................................................................................. 36
7.7 L-Drive – Transducer protection system .............................................................................................................. 37
8CARE AND MAINTENANCE 38
8.1 Maintenance information....................................................................................................................................... 38
8.2 Filter cleaning......................................................................................................................................................... 38
8.3 Troubleshooting .................................................................................................................................................... 39
8.3.1 No power, no sound, or sound is too low............................................................................................. 40
8.3.2 Bad sound .............................................................................................................................................. 41
8.3.3 Overheating ........................................................................................................................................... 41
9SPECIFICATIONS 42
10 APPENDIX 43
10.1 LA4 factory preset library (version 1.1)................................................................................................................. 43

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3INTRODUCTION
3.1 Welcome to L-ACOUSTICS
Thank you for purchasing the L-ACOUSTICS®LA4 Amplified Controller.
This manual contains important information on installing and operating the product correctly and safely. Read this
manual carefully in order to familiarize yourself with these procedures.
As part of a continuous evolution of techniques and standards, L-ACOUSTICS reserves the right to change the
specifications of the product and the content of this manual without prior notice. Please check the L-ACOUSTICS web
site @ www.l-acoustics.com on a regular basis for latest update.
If the product requires repair or if information upon warranty is needed, please contact an approved L-ACOUSTICS
distributor. In order to obtain the address of the nearest distributor go to the internet site @ www.l-acoustics.com.
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.
Figure 1: Unpacking of the LA4 amplified controller