Alcons LR28 User manual

Rigging manual LR28 Rev. 1.4 2
Table of contents _______________________________________________
1 Introduction______________________________________________________________________________________3
2 Important safety instructions and precautions _________________________________________________________4
3 Installation_______________________________________________________________________________________5
4 Rigging components ______________________________________________________________________________6
5 Array configurations ______________________________________________________________________________9
Cabinet connections _________________________________________________________________________________ 9
GRD28 options ____________________________________________________________________________________ 10
GRD28 hoist options ________________________________________________________________________________ 11
Fly mode array assembling and hoisting _________________________________________________________________________________ 12
Compression style array assembling and hoisting _________________________________________________________________________ 14
6 Service and support______________________________________________________________________________18
7 CE declaration of conformity_______________________________________________________________________20

Rigging manual LR28 Rev. 1.4 3
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 or 32x LB28 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. 1.4 4
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. Use slow speed or speed-controllable chain hoists. Avoid any form of excessive dynamic loading to the cabinet array assembly
13. 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.
14. Never leave the array unattended during the installation process. As a general rule Alcons Audio recommends the use of safety slings at all times.
15. Be cautious when ground-stacking a loudspeaker array.
16. 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.
17. Take into account the wind effects on dynamic load.
18. 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. 1.4 5
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. 1.4 6
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. 1.4 7
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
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.

Rigging manual LR28 Rev. 1.4 8
4. Rigging components __________________________________________
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.
WLDL28
Wheel dolly is used as a single cabinet transport option. Together with the WHFRML28, for the optional caterpillar style hoisting.
The SFTCVRLR28 soft cover is available for the LR28 single transport option.

Rigging manual LR28 Rev. 1.4 9
5. Array configurations___________________________________________
Cabinet connections
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.

Rigging manual LR28 Rev. 1.4 10
5. Array configurations___________________________________________
GRD28 options
The GRD28 has multiple mounting options. The picture on the right shows the different
pick-points for flying an array. Use 3,25T shackles in any situation. The A1 & A6/ A7
marked points are the default hoist points.
It is also possible to use one pick point from the A5 pattern. Use it only for max. 12x LR28
cabinets.
Use 2 hoists at all times.
In case of permanent installation, combine points A2 and A6 to create a stable 3-point
hang.
A3 indicates the mounting position of an angle inclinometer. It has a 4xø4mm;
16.5mm x 108.8mm hole pattern for the Teqsas laser/ inclinometer.
Always use both A4 pins when adjusting the extender bar pick-point A7. The extender bar
can also be mounted at the front.
The FCGRD28 flightcase is available as a transport option.
The picture on the left shows the GRD28 in the stacked position. This is used when the
PRRGL28 Pre-rig is not suitable. Ensure that there is a stable and flat surface on which
to build the stacked array. A max. of 4 cabinets can be stacked in this way. Take off the
adjustable foot frame and attach it on the extender bar. Lock it with both small pins. The
front of the stacked array will rest on the front A8 stands. The back can be extended
and height-adjusted. Assemble the array of 4 cabinets and use the compression fly slot
on the angle arm, when adjusting the angles.

Rigging manual LR28 Rev. 1.4 11
5. Array configurations___________________________________________
GRD28 hoist options
The schematic picture below shows the possible array hang options A-D in fly mode and stack arrangement E&F
As stated earlier, the array angles can be determined through the Alcons Ribbon Calculator™ simulation program. The Centre of Gravity needs to be between
the outermost pickpoints at all times!
When stacking (E&F), ensure that the centre of gravity is well within the PRRGL28/ GRD28 support points.
The picture below shows the dimensions of the GRD28 at the different extendable positions of the GRD28EXTBR extender bar.

Rigging manual LR28 Rev. 1.4 12
5. Array configurations___________________________________________
Fly mode array assembling and hoisting
Using this mode the LR28 rigging system uses the vertical PRRGL28 pre-rig transporter combined with (non-compression) vertical fly array hanging. This mode
uses the top “fly slot” in the angle arm and is best suitable for large 12->24 pcs arrays
The schematic drawing shows the building steps G->L with 2 chain hoists.

Rigging manual LR28 Rev. 1.4 13
5. Array configurations___________________________________________
Fly mode array assembling and hoisting
The numbers in the picture, correspond with the LR28 rigging
components overview pictured earlier.
This flying option uses the PRRGL28 pre-rig transport option. The
PRRGL28 (E) transports 4x LR28 or LB28 cabinets in a vertical
position. Take off the protective SFTCVR4LR28
Start with the first 4 cabinets. (G). This is a two man job
Hold each cabinet and remove the angle pin (6) and red buttoned pin
(12). Let it rest onto the lower cabinet. Work your way down.
Attach the GRD28 and make the angles using the top “fly” slot in the
angle arm, with the angle pin (6). Place the red pin (12) in the rubber
lined transport hole. Attach GRD28 to the top cabinet. Hoist the first
piece of the array. It will stretch out to the correct cabinet angles.
When the first array piece is still at working height, speaker cabling
can be attached using a hoist sling to the extender bar, to take the
cable weight away from the array.
Place the next PRRGL28 under the suspended array (H). Make the
connection using the front couplers (2) and angle arm (8).
Hoist the 8 piece array (I). Remove the red 0° pins (12) and angle
pins (6) from the bottom 4 cabinets. Lower the whole array down and
pull it backwards (J). The lower cabinets will compress against each
other.
The angles can now be set using the angle pins (6) and the top “fly”
slot .
Hoist the array. The array will stretch out to the desired angles.
detach the PRRGL28 from the array (K).
Angle out the array using the back/ front chain hoists (L).
Landing the array
Attach the PRRGL28 pre-rig to the bottom cabinet with the small
angle arm at 0°. This is a two man job. Land the array and pull the PRRGL28 backwards. The cabinets will start to compress against each other. This will take
of the weight of the angle pins (6). Pull the angle pins (6) of the bottom 4 cabinets. Hoist the array back up. The 4 cabinets will stretch out to 0°. Put the red pins
(12) into their 0° holes and lower the PRRGL28 onto the ground. Detach the top 4
th
cabinet on the PRRGL28 from the array. Repeat this for the remaining array
pieces.

Rigging manual LR28 Rev. 1.4 14
5. Array configurations___________________________________________
Compression style array assembling and hoisting
This flying option is best suited for small 2->12 pcs arrays. The red buttoned pin (12) is crucial in this situation. It
ensures that the cabinets (1) will stay in a 0° position. The angle arm can be adjusted while this pin is in position or “0°
hole”.
Take the top cabinet angle arm out of the transport position and put the red pin (12) in.
Choose the angles by aligning the angle pin (6) with the bottom compression fly slot in the angle arm (8).
The angle setting can be done at the warehouse or on-site. There will be substantial pressure on the red pin (12) when
adjusting the angle arm (8).
A slight push/ tilt against the overlying cabinet will also help to ease this pressure. The angle frame (10) has special
hardened frame to guide the pin.
When the first cabinets are ready, attach GRD28 to the top cabinet. Ensure that it has the extender bar (B) mounted at the preferred
extension. Always use the 2 pins (A4) for each extender bar position
Use a hoist sling to take the weight of the speaker cables away from the cabinet array.
Attach a manual 0,75T lever hoist, with overload protection, from the bottom shackle position on the extender bar. Be sure to have
sufficient chain length. Use an extra safety chain in combination with the lever hoist. It is not allowed to use a motor hoist.
Take the PRRGL28 (E) off when the first 4 piece LR28 array is suspended. This is a two man job.
Remove all the red buttoned 0° pins (12) and place them in the rubber lined parking holes (13)
Position the next PRRGL28 under the suspended array. Ensure that the angle adjustments are done.
Lower the suspended array to make the three point connection (front couplers + angle arm coupling). You can remove the top red 0° pin
to make the back connection easier. When finished and the combined array is suspended in the air, pull out the red buttoned pins (12).
Continue this procedure until full array length is reached.
End with attaching the WLFRML28 (C) under the lowest cabinet. Slide the cabinet connecting pin (7) to the open position. Then hook the
frame onto the front couplers (2) and lock with the pins. Now make the connection with the cabinet connecting pin (7) and lock it.

Rigging manual LR28 Rev. 1.4 15
1
5. Array configurations___________________________________________
Compression style array assembling and hoisting
Start hoisting the (lever) hoist to make the cabinet angles. This has to be done by an authorised person. Stop when there is no more slack in the array. This
can be checked by pushing the array back and forth and listening for any slack noises in the angle setting frames.
Do not over-compress the array, as this can cause damage to the suspension system !
After the compression stage, the angle of the entire array can now be adjusted. Use an angle inclinometer on the GRD28.
The following schematic drawing shows the three hoisting stages with a 4 pcs array.
1) After array building
2) Compression to reach the desired angles
3) Array angling

Rigging manual LR28 Rev. 1.4 16
5. Array configurations___________________________________________
Compression style array assembling and hoisting
The schematic picture below shows compression style array hoisting, using two separate chain hoists. This set-up can be done with a max. of 12 cabinets. The
first motor hoist is connected to the hole nr. 5 (pattern A5) in the centre of gravity. The second hoist chain has to be attached to the WLFRML28 (C). In this
way, the angles can be set using compression and the entire array can be angled.
4) After array building
5) Compression to reach the desired angles
6) Array angling

Rigging manual LR28 Rev. 1.4 17
5. Array configurations___________________________________________
Compression style array assembling and hoisting
Landing the array compression style
De-compress the cabinets to 0° by releasing the tension of the lever hoist or back chain hoist. The whole array should now be hanging vertical. Remove the
WLFRML28 (C) and attach the PRRGL28 pre-rig (E). This is a two man job. The small angle arm has to be attached to the 0° hole to the angle arm connection
of the cabinet. See middle picture.
Put the red buttoned pins (12) into the angle arms of the first 4 piece array. Land the PRRGL28 and detach the (front and back) cabinet connection pins above
the top no. 4 cabinet on the PRRGL28 and put them into their transport recesses . Continue this procedure. Use the optional SFTCVR4LR28 to protect the
PRRGL28 for transport and storage.

Rigging manual LR28 Rev. 1.4 18
6. Service and support ___________________________________________
Warranty
Summary
Alcons Audio BV warrants the original purchaser and any subsequent owner of each new Alcons product, for a period of six years limited from the date of the
original purchase by the original purchaser that the new Alcons product is free of defects in materials and workmanship. Alcons Audio BV warrants the new
Alcons product regardless of the reason for failure, except as excluded in this warranty. In order to obtain warranty, you must keep the original sales receipt to
establish the exact date of purchase.
Items excluded from warranty
Warranty does not cover any product which has been damaged because of any misuse, accident, or negligence. Warranty also does not extend to a new Alcons
product if the serial number has been defaced, altered or removed.
What we will do
Alcons Audio BV will replace defective parts and repair malfunctioning products, regardless of the reason for failure (except as excluded). Warranty work can
only be performed at our authorized service centres, or at our factory.
Disclaimer
Alcons Audio BV is not liable for any damage to loudspeakers, amplifiers, or any other equipment that is caused by negligence, misuse or improper installation.
Alcons Audio BV is not liable for any incidental damages resulting from any defect in the new Alcons product. This includes any damage to another product or
products resulting from such a defect.
Alcons Audio BV reserves the right to change specifications without notice.

Rigging manual LR28 Rev. 1.4 19
6. Service and support ___________________________________________
Contact information
Mailing address:
Alcons Audio BV
De Corantijn 69
1689 AN ZWAAG
The Netherlands
Telephone
[phone]
World Wide Web:
http://www.alconsaudio.com
E-mail:
[email protected]om

Rigging manual LR28 Rev. 1.4 20
7. EC declaration of conformity____________________________________
Alcons Audio BV
De Corantijn 69
1689 AN ZWAAG
The Netherlands
States that the following products:
LR28 Rigging System
are in conformity with the provisions of the following EC directives and applicable
amendments:
Machinery 2006/42/EC
and the national laws to enforce this directive,
National standards and technical specifications applied: DIN EN ISO 12 100, DIN EN 1050, BGV C1
provided the mounting components are unaltered/modified and in “factory-original” condition.
Established at Zwaag, the Netherlands,
June 1th, 2015
T.H. Back
Managing Director