L-Acoustics LA-RAK User manual

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user manual
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user manual
VERSION 1.0
VERSION 1.0VERSION 1.0
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1SAFETY WARNINGS
SAFETY WARNINGSSAFETY WARNINGS
SAFETY WARNINGS
All information hereafter detailed applies for the L-ACOUSTICS® LA-RAK Touring Rack designated in this section
as ‘‘the product’’. The LA-RAK product includes the following components: RK 9U cabinet, LA-PO ER power
distribution panel, LA-PANEL signal distribution panel, and LA8 amplified controllers.
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 OLTAGE symbol indicates a potential risk of electric shock that could be life threatening.
In addition, the product may also be seriously damaged.
The WARNING symbol indicates a potential risk of physical harm to the user or people within close
proximity to the product.
In addition, the product may also be damaged.
The CAUTION symbol notifies the user about information to prevent possible product damage.
The IMPORTANT symbol is a notification of an important recommendation of use.
1.1.2 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 covers of the product electrical components:
On the rear panel of the LA8 amplified controllers, the lightning flashes symbols
next to the 4-pin Speakon® and 8-pin CA-COM® connector sockets indicate that
the product can deliver 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 amplified controller is operating without disconnecting the connector first.
!
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
ARNING:
RISK OF HAZARDOUS ENERGY
SEE OPERATING MANUAL
CLASS 2 PERMITTED
OLTAGE
!
IMPORTANT
!
CAUTION
!
WARNING

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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 any power cord is broken or frayed.
Protect any power cord from being walked upon or pinched, particularly at the plugs and the points
where the power cords exit from the apparatus.
8. Mains supply (see section 6.5 for details)
Only connect the product to an appropriate three-phase AC circuit and outlet.
Consult an electrician if the output voltage of the local AC mains is not known.
Any electric device must be approved for the local voltage & current rating.
The specific electrical safety regulations of the country of use must be strictly applied.
Warranty will not cover damages caused by a mains wiring error.
9. Grounding
The product may only be connected to mains power supply tied to earth. If the local outlet is obsolete,
consult an electrician.
The LA-POWER is fitted with grounding-type sockets. Do not defeat the earth connections between
the sockets and the product chassis.
10. Lightning storms
During lightning storms disconnect the product from mains.
Switching the amplified controllers off does not disconnect them from mains. Therefore, disconnecting
can only be achieved by removing the LA-POWER three-phase male plug from mains.
OLTAGE
OLTAGE
OLTAGE
OL
TAGE
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IMPORTANT
!
IMPORTANT

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11. Interconnections
When connecting the product to other equipment, turn the power off 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 amplified controller output in parallel or series with any other amplifier output or
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 amplified controller front panel attenuators 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 LA8 amplified controller cabinets are provided for ventilation to prevent from
overheating so as to ensure reliable operation. These openings must not be blocked or covered. The
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. ater 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 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.
Use only dry cloth when cleaning any product’s electrical part.
18. Servicing and replacement parts
Do not attempt to service any product component as removing covers may expose to dangerous
voltage or other hazards.
All service and repair work must be carried out by an L-ACOUSTICS®authorized dealer.
The use of unauthorized replacement parts may result in injury and/or damage through fire, electric
shock, or other electricity-related hazards.
OLTAGE
OLTAGE
OLTAGE
OLTAGE
!
CAUTION
!
CAUTION
!
CAUTION
!
WARNING

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19. Conditions which require immediate service
Servicing is required when the product has been damaged in any way such as:
•Any power supply cord or socket is damaged.
•Liquid has been spilled or an object has fallen into any product’s electrical component.
•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. System parts and rigging inspection
All system components must be inspected before use in order to detect any possible defects.
Please refer to the “Care and Maintenance” section of this manual as well as any other manuals
pertaining to the system for a detailed description of the inspection procedure.
Any part showing any sign of defect must immediately be put aside and withdrawn from use to be
inspected by qualified service personnel.
21. 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.
22. Personnel qualification
Installation of a rack assembly should only be carried out by qualified personnel that are familiar with
the rigging techniques and safety recommendations outlined in this manual.
23. Personnel health and safety
During installation of a rack assembly personnel should wear protective headgear and footwear at all
times. Under no circumstances personnel should climb on the rack assembly.
24. Additional rigging equipment
L-ACOUSTICS® is not responsible for any rigging equipment and accessories that are not
manufactured by L-ACOUSTICS®.
It is the user’s responsibility to ensure that the Working Load Limit (WLL) of all additional hardware
rigging accessories is greater than the total weight of the rack assembly in use.
25. Suspension points
It is the user’s responsibility to ensure that the Working Load Limit (WLL) of the suspension points
and/or chain hoists is greater than the total weight of the rack assembly in use.
26. System load capacity and setup safety limits
Load capacity and setup safety limits when flying or stacking a rack assembly should be strictly
followed according to the instructions outlined in this manual.
!
WARNING
!
WARNING
!
WARNING
!
WARNING
!
WARNING
!
CAUTION
!
CAUTION
!
WARNING

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27. Local regulations
Some countries require higher Ultimate Strength Safety Factors and specific rigging approvals. It is the
user responsibility to ensure that any overhead suspension of L-ACOUSTICS® systems has been made
in accordance with all applicable local regulations.
As a general rule, L-ACOUSTICS® recommends the use of safety steel at all times.
28. Flying a rack assembly
Always ensure that nobody is standing underneath the rack assembly when it is being raised.
As the assembly is being raised, check each individual rack to make sure that it is securely fastened to
the component above. Never leave the system unattended during the installation process.
29. Ground stacking a rack assembly
Do not ground stack the rack assembly on uneven ground or platform.
If the system is ground stacked on a structure, platform, or stage always check that this last can
support the total weight of the system.
Secure the system to the structure, platform, or stage using ratchet straps or any other applicable
device.
30. Dynamic load
When a system is deployed in an open air environment, wind effect should be taken into account.
Wind can produce dynamic stress to the rigging components and suspension points. If the wind force
exceeds 6 bft (Beaufort scale) it is highly recommended to lower down and/or secure the rack
assembly.
31. 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 written in this manual, particularly in the event of resale.
!
WARNING
!
WARNING
!
WARNING
!
WARNING
!
IMPORTANT

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1.3 EC declaration of conformity
L-ACOUSTICS®
13 rue Levacher Cintrat
Parc de la Fontaine de Jouvence
91462 Marcoussis Cedex
France
States that the following products:
Touring rack, LA-RAK (composed of the: Rack cabinet, RK 9U
Amplified controllers, LA8
Power distribution panel, LA-POWER
Signal distribution panel, LA-PANEL)
Flying frame, LA-RAK BUMP
Are in conformity with the provisions of:
Machinery Directive, 98/37/EC
Low oltage Directive, 73/23/EC
Electro-Magnetic Compatibility Directive, 89/336/EC
Applied rules and standards:
EN ISO 12100-1: 2004 (Mechanical Safety)
DIN 18800 (Mechanical Structure)
BG -C1 (Mechanical Standard applied in Germany)
EN60065 (Electrical Safety)
EN55103-1 (Emission)
EN55103-2 (Immunity)
Established at Marcoussis, France
June 2nd, 2008
Christophe Pignon

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2C NTENTS
C NTENTSC NTENTS
C NTENTS
1 SAFETY ARNINGS 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 .............................................................................................................................6
2 CONTENTS 7
3 INTRODUCTION 8
3.1 Welcome to L-ACOUSTICS®............................................................................................................................8
3.2 Unpacking .........................................................................................................................................................8
4 LA-RAK SIGNAL & PO ER DISTRIBUTION SYSTEM 9
5 LA-RAK TOURING RACK 12
6 INSTALLATION 16
6.1 Mounting components inside the LA-RAK ........................................................................................................16
6.2 Shipping the LA-RAK .......................................................................................................................................16
6.3 Stacking or flying the LA-RAK ..........................................................................................................................16
6.3.1 Stacking procedure...........................................................................................................................16
6.3.2 Flying procedure using the LA-RAK BUMP........................................................................................19
6.3.3 Flying procedure using the K1-BUMP................................................................................................21
6.4 Amp cooling ....................................................................................................................................................22
6.5 Connecting LA-RAK to AC mains.....................................................................................................................23
6.5.1 LA-POWER three-phase circuit ........................................................................................................23
6.5.2 LA-POWER mono-phase circuits ......................................................................................................24
6.6 Connecting LA-RAK to analog audio source.....................................................................................................25
6.6.1 External analog audio connection......................................................................................................25
6.6.2 Internal analog audio connection.......................................................................................................27
6.7 Connecting LA-RAK to L-NET network...........................................................................................................28
6.7.1 LA-PANEL digital overview...............................................................................................................28
6.7.2 External digital connection................................................................................................................28
6.7.3 Internal digital connection.................................................................................................................31
6.8 Connecting loudspeakers to LA-RAK ...............................................................................................................33
7 CARE AND MAINTENANCE 34
7.1 Maintenance information .................................................................................................................................34
7.2 Testing procedure ...........................................................................................................................................34
7.2.1 Check of internal components ..........................................................................................................34
7.2.2 Mechanical assembly and rigging parts inspection ..............................................................................34
7.3 Spare parts and recommended tools................................................................................................................35
8 SPECIFICATIONS 36
9 APPENDIX: CONNECTING THE LA-PO ER US 38
9.1 LA-RAK and LA-POWER US presentation........................................................................................................38
9.2 Connecting LA-RAK US to AC mains ...............................................................................................................40
9.2.1 LA-POWER US three-phase circuit...................................................................................................40
9.2.2 LA-POWER US mono-phase circuits.................................................................................................41

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3INTR DUCTI N
INTR DUCTI NINTR DUCTI N
INTR DUCTI N
3.1 elcome to L-ACOUSTICS®
Thank you for purchasing the L-ACOUSTICS® LA-RAK Touring Rack.
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 update.
Should the product requires repair or if information about the warranty is needed, please contact an approved
L-ACOUSTICS® distributor. In order to obtain the address of the nearest distributor go to the L-ACOUSTICS® web
site.
3.2 Unpacking
Carefully open the shipping carton and check the product for any noticeable damage. Each L-ACOUSTICS® product is
tested and inspected before leaving the factory and should arrive in perfect condition.
If found to be damaged, notify the shipping company or the distributor immediately. Only the consignee may 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 LA-RAK package consists of the following components (see from Figure 4 to Figure 7):
•One L-ACOUSTICS® RK 9U cabinet with one detachable dolly board and two coupling bars.
•Three L-ACOUSTICS® LA8 amplified controllers.
•One L-ACOUSTICS® LA-PO ER 230 power distribution panel.
•One L-ACOUSTICS® LA-PANEL patch panel with eight XLR cables and six CAT5e U/FTP cables.
The LA-RAK BUMP package consists of the following components (see Figure 8):
•One L-ACOUSTICS® LA-RAK BUMP flying frame.
•Two ⅝” shackles.
The power distribution panel mounted into the rack must be adapted to the mains rating of the
country of use.
•In Europe use the LA-POWER device (230 version) presented all along this manual.
•In USA use the LA-POWER US device (120 version) presented in Appendix 9.
•In any other country contact a local L-ACOUSTICS® distributor.
!
IMPORTA
NT

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SIGNAL & P WER SIGNAL & P WER
SIGNAL & P WER D
DD
DISTRIBUTI N
ISTRIBUTI NISTRIBUTI N
ISTRIBUTI N SYSTEM
SYSTEMSYSTEM
SYSTEM
The L-ACOUSTICS® LA-RAK Touring Rack is the central element of the new L-ACOUSTICS® system architecture
built upon the LA8 amplified controller. It offers an advanced rack solution for all L-ACOUSTICS® systems covering
signal and power distribution in a comprehensive plug and play touring package. LA-RAK was created as a universal
platform designed to facilitate cross-rental and to ensure compatibility with the legacy analog cabling standard of
L-ACOUSTICS® systems.
The components of the LA-RAK related L-ACOUSTICS® systems are as follows (see Figure 1):
K1, KUDO®, V-DOSC®  Full range active 3-way WST
®
enclosures
K1-SB  Arrayable LF enclosure for K1
dV-DOSC, ARCS®  Full range active 2-way WST
®
enclosures
dV-SUB  Subwoofer extension for d -DOSC
115XT HiQ  Full range active 2-way coaxial enclosure
SB118, SB28  Subwoofer enclosures
LA-RAK  Amp rack for three LA8 amplified controllers
LA NET ORK MANAGER  Remote control software
SOUNDVISION  Acoustical and mechanical 3D modeling software
The LA-RAK is compatible with standard L-ACOUSTICS
®
accessories. These accessories include the L-ACOUSTICS
®
DOM2 and DOM30 analog signal cables with respective lengths of 2 m/6.5 ft and 30 m/100 ft. These cables are for
connecting an analog sound source (mixing console or EQ device) to the LA-RAK or for linking two LA-RAK. Each cable
is a symmetric 6-pair cable fitted with PA-COM
®
19-pin female connectors (CA-COM
®
compatible). Note: Connection
to the XLR outputs of the analog source needs the addition of the DOMP-2 and DOMF cables (see section 6.6.1).
Are also available the L-ACOUSTICS® SP.7, SP10, SP25, DO.7, DO10, DO25, DOFILL-LA8, DO3 FILL, and
DOSUB-LA8 loudspeaker cables. The respective lengths are 0.7 m/2.3 ft for a ‘‘.7’’ cable, 10 m/32.8 ft for a ‘‘10’’
cable, and 25 m/82 ft for a ‘‘25’’ cable. These cables allow connection of the enclosures directly to the LA8 amp
outputs. Each cable is a 4 or 8-conductor cable with 4 mm2 conductor cross-section (13 SWG, 11 AWG) and features
Speakon® NL4 and/or PA-COM® 8-pin connectors. For more details refer to each enclosure’s User Manual as well as
the ‘‘LA8 – User Manual’’ (all available on the L-ACOUSTICS® web site).
Each system is driven and powered by the L-ACOUSTICS® LA8 amplified controller. This ensures intelligent
protection, filtering, and equalization of the enclosures. Four amp channels are provided along with OEM factory preset
library for optimization of the system performances within the limits of the recommended configurations.
Each system design configuration should first be modeled and studied using the L-ACOUSTICS® SOUNDVISION
software. The software predictions are based on the preset parameters stored in the amplified controller.
Up to 253 amplified controllers can be interconnected through the proprietary L-ACOUSTICS® L-NET network and
be controlled using the L-ACOUSTICS® LA NET ORK MANAGER software. Note: An additional Ethernet®
switch is necessary to achieve star network topology.
The LA-RAK is digital audio ready with sockets to connect to the proprietary L-ACOUSTICS® L-DGA network. This
option will be available as a future development on the amplified controllers. Please check the L-ACOUSTICS® web
site on a regular basis for latest update.
Detailed description on the use of the LA8 amplified controller, SOUND ISION and LA NETWORK MANAGER
softwares is beyond the scope of this manual. Please refer to the applicable documentation (available on the
L-ACOUSTICS® web site).

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Figure 1: L-ACOUSTICS® components which connect to the LA-RAK
V
-
DOSC
®
dV
-
DOSC
115XT HiQ
KUDO
®
K1
K1
-
SB
LA
-
RAK
SOUNDVISION
ARCS
®
SB
118
SB28
dV
-
SUB
LA NET ORK MANAGER
ETHERNET S ITCH
(not provided)

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The LA-RAK working principle is entirely modular and the engineer can physically assemble and interconnect multiple
elements to fit numerous applications. The LA-RAK configuration based on a multiple of 3 LA8 yields the maximum
flexibility and power resources for any L-ACOUSTICS® system from compact coaxial systems up to KUDO® and K1
stadium line source array systems, as it is shown in Figure 2:
Figure 2: LA-RAK power and flexibility capability
LA
-
RAK power capability (one system driven by all 3 LA8)
LA-RAK flexibility capability (split
⅓
subs +
⅔
tops)

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The L-ACOUSTICS® LA-RAK is composed of the RK 9U cabinet in which are mounted three LA8 amplified
controllers as well as the LA-POWER and LA-PANEL power and signal distribution panels. In addition, the LA-RAK can
be flown under the LA-RAK BUMP flying frame.
Figure 3: Equipped LA-RAK
Front
Rear

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The L-ACOUSTICS® RK 9U cabinet is a dual structure consisting of a rubber shock inner steel frame braced by an
external aluminum frame sided with highly resistant polyethylene panels. This ensures structural integrity while offering
decoupling and maximum protection of the electronics inside the rack. Two retractable doors protect the internal
components during transport.
On the front face, two extra U spaces can be fitted with a shelf to receive additional switches for L-NET network star
topologies.
On the rear face, two hinge-mounted panels cover and protect the analog modulation and network connectors of the
amplified controllers to create a neat and tangle-free cable environment. The rear central part of the amplified
controllers remains accessible with its CA-COM® and Speakon® sockets and therefore offers the same functionality as a
speaker output patch panel (see section 6.8).
The RK 9U is equipped in standard with a detachable transport dolly board and two coupling bars. These last also allow
arraying several LA-RAK in flown or stacked configurations.
Figure 4: The RK 9U cabinet
Hinge
-
mounted panel (x2)
Polyethylene
panel
Steel
frame
Retractable door storage slot (x2)
Rubber shock mount (x8)
Dolly board
Coupling bar (x2)
Aluminum frame

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The L-ACOUSTICS® LA8 amplified controller belongs to the new generation of high-end integrated controllers
entirely dedicated to the comprehensive operation of L-ACOUSTICS® loudspeaker systems. The LA8 combines in a 2U
lightweight chassis the resources of a 2 x 4 DSP engine driving four channels of amplification delivering up to
1800 W each at 4 ohms, a storage capacity of 99 presets, a user-friendly front panel interface, two I/O Ethernet®
connection ports for network remote control, a connection panel for analog audio inputs, and speaker outputs.
Figure 5: The LA8 amplified controller
The L-ACOUSTICS® LA-PO ER is a 2U/19” I/O 230 power distribution panel featuring a 32 A three-phase
circuit: one IN plug and one LINK OUT socket to power a secondary rack. This configuration allows the power to be
automatically balanced with an even number of LA8 per phase.
Three “Shuko” AC outlets (L1, L2, and L3) are available for LA8 and three additional outlets (1 x “Shuko” and 2 x IEC)
are to power auxiliary accessories such as Ethernet® switches, portable computer, and the like. All circuits are
protected by discrete breakers and three LED help monitor phase presence.
Note: The three LA8 AC outlets can be replaced by a 3 x 20 A Powercon® plate using the predrilled template fitted
with four M5 screws (the “M5” notation refers to the European standard, see applicable external documentation).
Note: See Appendix 9 for LA-POWER US description or contact a local L-ACOUSTICS® representative for any
country located outside Europe and USA.
Figure 6: The LA-PO ER
L1, L2, L3, and Aux. circuit breakers
L1, L2, and L3 “Shuko” outlets
Auxiliary IEC outlets
L1, L2, and L3 phase presence LED
M5 insert (x4)
Auxiliary “Shuko” outlet
IN plug
LINK OUT socket

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The L-ACOUSTICS® LA-PANEL front patch panel allows distribution of analog audio signals using I/O PA-COM® 19-
pin connectors, ensuring that all available 6 analog inputs of amplified controllers can be used within a single
LA-RAK and linked out to the next one. The PA-COM® connectors ensure compatibility with the previous
L-ACOUSTICS® standard (DOM2, DOM30, DOMF, and DOMM cables).
The panel also features 4 Ethercon® I/O sockets for L-NET control & monitoring network and L-DGA digital audio
network (available as a future development).
Figure 7: The LA-PANEL
The L-ACOUSTICS® LA-RAK BUMP flying frame is engineered to fly 4 LA-RAK for a drive capacity of up to 24 K1
enclosures. It can be flown using single pick-point and secured to an additional safety point. It is assembled with bolts
for mechanical integrity visual check and is protected by polyester-coating to enhance weather resistance.
Figure 8: The LA-RAK BUMP
PA
-
COM
®
19
-
pin connectors
(external analog connections)
Ethercon
®
sockets
(external digital connections)
RJ45 sockets with built in PCB
(internal digital connections)
XLR 3
-
pin connectors
(internal analog connections)
Strain relief protection plate for netwo
rk I/O
Internal network cable (x4)
Shackle for pick point
Safety point
Bolt
Stacking runn
er (x4)
Rigging rail (x2)

LA
LALA
LA-
--
-RAK
RAKRAK
RAK T
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6INSTALLATI N
INSTALLATI NINSTALLATI N
INSTALLATI N
6.1 Mounting components inside the LA-RAK
The 9U inner frame (see Figure 4) is for mounting components to both front and rear faces:
•The LA-PANEL and optional switches mount to the front face using four screws and washers each.
•The LA-POWER mounts to the rear face using four screws and washers.
•Each LA8 mounts to both front and rear faces using eight screws and washers.
During transport or while on tour it is essential that the LA8 controllers are rear supported
in addition to the front panel mounting. Use the rear rack support brackets provided with
each LA8 or the LA-RAK optional spacers (see references in section 7.3).
6.2 Shipping the LA-RAK
The removable dolly board (see Figure 9) is for shipping a vertical array of up to two LA-RAK. It secures to the
bottom LA-RAK using two coupling bars (see section 6.3).
It is recommended to use the removable dolly board for shipping the LA-RAK.
A maximum of two LA-RAK can ship onto one dolly board.
6.3 Stacking or flying the LA-RAK
The LA-RAK features four fully integrated rigging rails on top and bottom faces as well as four stacking runners which
mate with four runner guides. These are for assembling several LA-RAK in flown or stacked configurations such as:
•Stacking a vertical array of up to 3 LA-RAK onto one dolly board.
•Flying a vertical array of up to 4 LA-RAK underneath the L-ACOUSTICS® LA-RAK BUMP flying frame
or onto the L-ACOUSTICS® K1-BUMP flying frame.
6.3.1 Stacking procedure
All along the procedure:
•Strictly follow the sequence of the successive steps.
•Systematically ensure that each spring-loaded safety is in locking position.
1. Put a first LA-RAK at the stacking location.
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!
CAUTION

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2. Take a second LA-RAK and remove its dolly board:
a. Turn a spring-loaded safety and slide out the coupling bar.
b. Repeat for the second coupling bar.
Figure 9: Removing the dolly board from the LA-RAK
3. Lift up the second LA-RAK and put it onto the first one: align the rails and put the stacking runners onto the
runner guides.
4. Secure the second LA-RAK to the first one:
a. Turn a spring-loaded safety and slide the coupling bar in along the rails until the safety has returned to
locking position (a click should be heard).
b. Repeat for the second coupling bar.
Figure 10: Rigging a second LA-RAK
a.
a
.
b
.
b
.
a
.
a
.
b
.

LA
LALA
LA-
--
-RAK
RAKRAK
RAK T
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5. Put a third LA-RAK onto the second one by repeating the steps from 2 to 4.
A maximum of three LA-RAK can be stacked onto one dolly board.
Secure the LA-RAK stacked assembly to the structure, platform, or stage using ratchet strap or
any other applicable device.
Figure 11: Three stacked LA-RAK (maximum configuration)
!
WARNING