Alcons LR28 User manual
Rigging manual LR28 Rev. 1.45
2
Table of contents _______________________________________________
1 Introduction______________________________________________________________________________________3
2 Important safety instructions and precautions _________________________________________________________4
3 Installation_______________________________________________________________________________________5
4 Rigging components ______________________________________________________________________________6
5 Array configurations _____________________________________________________________________________10
Cabinet connections
_________________________________________________________________________________ 10
GRD28 options
_____________________________________________________________________________________ 12
GRD28B options
____________________________________________________________________________________ 13
GRD28 hoist options
_________________________________________________________________________________ 14
GRD28B hoist options
________________________________________________________________________________ 15
Fly mode array assembling and hoisting ____________________________________________________________________________________
16
Compression style array assembling and hoisting ____________________________________________________________________________
18
6 Service and support______________________________________________________________________________23
7 CE declaration of conformity_______________________________________________________________________25
Rigging manual LR28 Rev. 1.45
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1. Introduction__________________________________________________
Dear customer,
Congratulations on your purchase of an Alcons Audio LR28 line array loudspeaker and thank you for your confidence in Alcons products. We are very honoured
to welcome you to the growing family of Alcons ambassadors!
For your safety, please read the Important safety instructions and the precautions section before rigging a loudspeaker array.
General features
The LR28 has the following features:
A unique seamless arrayability up to/beyond 20kHz.
Symmetrical 80°/110° dispersion in the non-coupling plane.
Ultra-high-performance line-array system for even the largest applications.
Non-compressed 1:1 HiFi-quality sound reproduction.
Intuitive predictable linear response behavior and identical tonal balance at any SPL.
14” pro-ribbon HF section with exceptional intelligibility and “throw”.
Maximum dynamic headroom reserve with up to 90% less distortion.
Fully coherent and symmetric pattern control in horizontal and vertical plane.
SIS™ pre-wired for very high system damping and further reduced distortion.
All Neodymium drivers for excellent performance-to-weight ratio.
LR28 rigging features
The trapezoidal cabinet is fitted with integrated mounting hardware, enabling angle-setting on the cabinets, without lifting the array, resulting in safer and faster
set-up with minimal handling. The rigging system supports different modes of array assembling and has a working load limit of 24x LR28, 32x LB28 or 16x
LR28B cabinets under 10:1 safety.
Manual
This manual is written in a compact and easy readable way. You can contact Alcons Audio for more in-depth information on different items or situations
Rigging manual LR28 Rev. 1.45
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2. Important safety instructions and precautions _____________________
Read this manual
1. Follow all safety instructions as well as the warning messages.
2. Never incorporate equipment or accessories not approved by Alcons Audio.
3. Read all the related product information before using the system.
4. Work with qualified personnel for rigging the system.
5. Installation should only be carried out by qualified personnel who are familiar with the rigging techniques and safety recommendations stated in this
manual.
6. Ensure health and safety during installation and setup.
7. All persons must wear protective headgear and footwear at all times. Under no circumstances personnel is allowed to climb into a loudspeaker assembly.
8. Respect the Working Load Limit (WLL) of third party equipment.
9. Alcons Audio is not responsible for any rigging equipment and accessories provided by third party manufacturers. Verify that the Working Load Limit
(WLL) of the suspension points, chain hoists and all additional hardware rigging accessories is respected.
10. Respect the maximum configurations and the recommended safety level.
11. For safety issue, respect the maximum configurations outlined in this manual. To check the conformity of any configuration in regards with the safety level
recommended by Alcons Audio.
12. Be cautious when flying a loudspeaker array. Always verify that no one is standing underneath the loudspeaker array when it is being raised or lowered.
As the array is being raised, check each individual element to make sure that it is securely fastened to the adjacent element.
13. Never leave the array unattended during the installation process. As a general rule Alcons Audio recommends the use of safety slings at all times.
14. Ensure that the surface is suitable for ground-stacking a loudspeaker array.
15. Do not stack the loudspeaker array on unstable ground or surface. If the array is stacked on a structure, platform, or stage,
always check that the latter can support the total weight of the array. As a general rule, Alcons Audio recommends the use of safety straps at all times.
16. When a loudspeaker assembly is deployed in an open air environment, wind can produce dynamic stress to the rigging components and suspension
points. If the wind force exceeds 6 Beaufort scale, lower down and/or secure the loudspeaker array.
The exclamation point within a triangle is intended to alert the user to the presence of important operating
instructions in the literature accompanying the product.
Rigging manual LR28 Rev. 1.45
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3. Installation___________________________________________________
Unpacking
Carefully open the shipping carton and inspect all the parts. Every Alcons product is thoroughly tested and inspected before leaving the factory and should arrive
in perfect condition. If you find any damage, notify the shipping company immediately. Only you, the consignee, may initiate a claim for shipping damage. Be
sure to save all packing materials for the carrier’s inspection.
Rigging manual LR28 Rev. 1.45
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4. Rigging components __________________________________________
LR28 loudspeaker
1) LR28/ LB28 cabinet LR28/80° cabinet (drawn)
2) Front coupler Coupler, lockable with quick release pin
3) Bar handle Handles in the cabinet ensure easy handling
4) Pin pre-rig transport Pin holding the cabinet at 0° on the PRRGL28
5) Signal input/ link Input/ link for the audio signal
6) Angle frame This frame holds features for the angle setting and back coupling
7) Pin slider Black color indicates LR28/80°, green LR28/110°
2
1
7
3
6
5
4
Rigging manual LR28 Rev. 1.45
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4. Rigging components __________________________________________
LR28B loudspeaker
1) LR28B cabinet LR28B cabinet
2) Coupler Rotatable couplers, lockable with quick release pin
3) Bar handles Handles in the cabinet ensure easy handling
4) Bottom connector Connection with two holes, enabling a 2,5° splay angle
1
2
4
3
Rigging manual LR28 Rev. 1.45
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4. Rigging components __________________________________________
GRD28
This grid is used to suspend a vertical cabinet array. It features a sliding
extender bar and an adjustable foot for stacking. It has a mounting position and
through hole for the Teqsas laser/ inclinometer. It has a WLL of 24x LR28, or
32x LB28 cabinets. all points measure 20mm/0.8-in. It is recommended to use
3,25T shackles in any situation and always use two hoists
GRD28B
The GRD28B enables the LR28 line-array modules, the LB28 line-array
extension modules, LR24 line-array modules and LR28B line-array bass
modules to be flown and ground stacked. The grid can be suspended from
multiple hoist options on top of the grid (all points 20mm/0.8-in for 3,25T
shackles).
CNVB1828
This bracket is a transition frame to suspend a small LR18 array under a LR28 for down fill
applications. It enables a maximum tilt angle of 8° between LR28 and LR18. CNVB1828 is
certified for six (6) cabinets LR18.
Rigging manual LR28 Rev. 1.45
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4. Rigging components __________________________________________
PRRGL28
This wheeled Pre-rig frame is used to transport 4 LR28 or LB28 cabinets. It can
also be used as a ground stack base, with optional adjustable SWFTPRRGL28
feet . It has a 0° or 6° angle arm. The frames can be stored on top of each other,
using the wheel recesses. The SFTCVR4LR28 soft cover is an essential option
for the LR28 Pre-rig.
PRRGLR28B
This wheeled Pre-rig frame is used to transport up to 3 LR28B. An optional soft
cover is an essential option for the LR28B Pre-rig.
WLFRML28
This frame is used as a pull-back device for compression style flying. The hoist point measures
20mm/0.8-in for a 3,25T shackle. The wheels are detachable. It also ensures, with the wheels
mounted, that the bottom cabinet does not get damaged during the optional caterpillar style hoisting.
Rigging manual LR28 Rev. 1.45
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5. Array configurations___________________________________________
Cabinet connections LR28
Array assembling can be done using two fly options. This is determined by the available space, time or available parts.
There are 10 user selectable logarithmic angles, which can be determined by the Alcons Ribbon Calculator™ simulation
program. The angles are suitable for both caterpillar and compression style array flying.
The angle lay-out is pictured below. The “P” indicates the position of the angle pin, when parking the angle arm. This is done
in case of single LR28 cabinet transportation. The general rigging guidelines on the right is also shown at the back of the
cabinet.
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