Alcons LR24/90 User manual

Rigging manual LR24 Rev. 1.21
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Table of contents _______________________________________________
1 Introduction______________________________________________________________________________________3
2 Important safety instructions and precautions _________________________________________________________4
3 Installation_______________________________________________________________________________________5
4 Rigging components ______________________________________________________________________________6
5 Array configurations _____________________________________________________________________________ 10
6 Service and support______________________________________________________________________________ 21
7 CE declaration of conformity_______________________________________________________________________23

Rigging manual LR24 Rev. 1.21
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1. Introduction__________________________________________________
Dear customer,
Congratulations on your purchase of an Alcons Audio LR24 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 LR24 has the following features:
12” pro-ribbon HF section with exceptional intelligibility and “throw”.
Non-compressed 1:1 HiFi-quality sound reproduction.
Maximum dynamic headroom reserve with up to 90% less distortion.
Intuitive predictable linear response behavior and identical tonal balance at any SPL.
A unique seamless arrayability up to/beyond 20kHz.
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.
LR24 rigging features
The rigging system enables angle-setting on the cabinets without lifting the array, resulting in safer and faster set-up with minimal handling. The unique, patent-
pending flying system facilitates both compressed and non-compressed suspension. It has a WLL of 24 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 LR24 Rev. 1.21
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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 LR24 Rev. 1.21
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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.

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4. Rigging components __________________________________________
LR24 loudspeaker
1) LR24 cabinet LR24 cabinet (shown)
2) Front coupler Front couplers, lockable with quick release pin
3) Bar handles Handles in the cabinet ensure easy handling
4) Pin angle setting Pin determines the angle between the cabinets
5) Angle arm + lever Lever to turn the angle arm
6) Signal input/ link Input/ link for the audio signal
7) Angle frame This frame holds features for the angle setting and coupling
8) Connection pin Bottom Pin for connection to a lower cabinet
9) Red 0° pin Pin keeping the cabinets in a 0° position enabling angle setting in compression mode
1
2
6 3 3
7
5
4
2
8
9

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4. Rigging components __________________________________________
GRD24B
The GRD24B enables the LR24 line-array modules to be flown and ground
stacked. The grid can be suspended from multiple hoist options on top of the grid
or with the central “single pick-point” bar for smaller arrays (all points 14mm/0.55-
in for 1,5T shackles).The GRD18B has a weight of 35 kg / 77 lb and is certified for
24 cabinets LR24
GRD28B
The GRD28B enables LR24 line-array modules to be flown or stacked
together with LR28B. Please refer to the LR28 rigging manual.
GRD24EXTBR
This is an extension bar, which can be attached on top of the GRD24B, to extend
the leverage capabilities of the GRD24B, with larger centre-of-gravity (COG) array
off-sets.
With the GRD24EXTBR mounted at the front side of the GRD24B, the upward array
tilt is extended; With the GRD24EXTBR mounted at the rear side of the GRD24B,
the downward array tilt is extended. The front and rear holes measure 20mm/0.8-in
to facilitate 3,25T shackles. Always use both quick release pins for the GRD24B/
GRD24EXTBR connection.
PBFRML24
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.
CNVB1824
This bracket is a transition frame to suspend a small LR18 array under a LR24 for down
fill applications. It enables a maximum tilt angle of 8° between LR24 and LR18.
CNVB1824 is certified for six (6) cabinets LR18.

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4. Rigging components __________________________________________
PRRGL24
The LR24 is transported with 4 units on the PRRGL24 pre-rig dolly frame,
facilitating curved or straight stacks. The dolly frame also enables a ground-stack
configuration. With the optional detachable legs the tilt-angle can be
adjusted.The LR24 is transported with 4 units on the PRRGL24 pre-rig dolly
frame, facilitating curved or straight stacks. The dolly frame also enables a
ground-stack configuration; With the optional detachable legs the tilt-angle can
be adjusted.
STCKFTL24
Optional stack foot, mounted on a PRRGL24 corner
PRRGL24TOP
A detachable plateau can be mounted on top of a curved or straight stack.
This can be used as a flat stowage plateau. The maximum load is 22 kg/ 55 lb
The pre-rig dollies can be placed on top of each other together with the plateaus.

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4. Rigging components __________________________________________
Cabinet connections LR24
Array assembling can be done in two ways: Fly mode or Compression mode. 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
Fly and Compression mode array flying.
The angle lay-out is pictured below. The “P” indicates the position of the angle pin,
when parking the angle arm.
The picture on the right shows the
angle frame(7), with the angle
arm(5) in its parking position,
locked by the angle pin (4). It has
two slots for both modes.
The arm is fitted with a tab, to hold
the arm when placing it into
position.
The indication on the corner handle
bar indicates the horizontal
dispersion of the LR24 cabinet; 90°
as shown, or 120°
7
5
4

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5. Array configurations___________________________________________
GRD24B options
The GRD24B has multiple mounting options. The picture on the left shows the different pick-points for flying an array. The A1 & A2 marked points are the default
hoist points.
It is also possible to use one pick point from the A1
linear pattern. Use it only for max. 12x LR24. Use
two hoists at any time. This is safer and easier for
array building
When hanging a 12-24 LR24 array with 2 hoist
points, use the outermost front and rear A1 pick
points.
In case of a permanent installation, combine points
A1 and A2 for a stable 3 or 4-point hang. Use 1,5T
shackles at all times
A3 indicates the mounting position of an angle
inclinometer. It has a 4x ø4mm; 16.5mm x
108.8mm hole pattern for the Teqsas laser/
inclinometer.
A4 is a 20mm/0.8-in hole for a 3,25T shackle used
in compression mode flying, or as a cable sling
attachment.
The 2 holes A5 will hold the connection pin between
the LR24 angle arm and GRD24B
A8 marks the removable angle arms which are
used on the top connection points on the GRD24B
and are pinned by G1. The arms are secured in
their parking space with their locking pins and a
small fastening knob.

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5. Array configurations___________________________________________
GRD24B options
The schematic picture below shows the possible array hang options a-d and stack arrangement e with LR24.
As stated earlier, the array angles can be determined through the Alcons Ribbon Calculator™ simulation program.
When ground stacking (e), ensure that the centre of gravity is well within the grid’s base area.
single point hangs can be done but are not recommended with LR24 due to safety and array building complications.

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5. Array configurations___________________________________________
LR24 transport and array building options
Curved pack/ Fly mode:
All LR24 cabinets are connected vertically
in a curved pack. This saves building space
and enables Pre-flight angle-setting. All red
pins are stowed in their parking holes. The
bottom cabinet is mounted to the PRRGL24
according to the picture on the right. Turn
the triangular angle arm of the PRRGL24 in
the upright position and pin with the locking
pin. First, pin the top hole of the angle arm
with the bottom cabinet connection pin (8).
Then mount the front cabinet couplers (2) to
the rear holes of each dual hole bracket.
Mounting of the PRRGL24TOP on a curved pack
Mount the front brackets of the PRRGL24TOP with their rear holes to the top
cabinet couplers. Both brackets are in between the cabinet couplers Connect the
cabinet angle bar (5) according to the picture on the left. It is also marked on the
rear side of the PRRGL24TOP. Pin its locking pin through the angle arm in the
bottom hole of the middle brackets of the PRRGL24TOP. Pin the angle pin (4)
through the ‘P’ marked hole in the angle frame (7) and align it with the
compression slot of the angle arm.

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5. Array configurations___________________________________________
LR24 transport options
Straight pack/ compression mode:
All LR24 cabinets are connected vertically
in a straight pack. This saves building
space and enables pre-flight angle-setting.
All red pins are placed in the angle arm
hole. Except the angle arm of the top
cabinet. The bottom cabinet is mounted to
the PRRGL24 according to the picture right.
Turn the triangular angle arm of the
PRRGL24 in the short position. Do not use
the locking pin. First, pin the top hole of the
angle arm with the bottom cabinet
connection pin (8). Then mount the front
cabinet couplers (2) to the front holes of
each dual hole bracket.
Mounting of the PRRGL24TOP on a straight pack
Mount the front brackets of the PRRGL24TOP with their front holes to the top
cabinet couplers. Both brackets are on the inside of the cabinet couplers.
Connect the cabinet angle bar (5) according to the picture on the left. It is also
marked at the rear side of the PRRGL24TOP. Pin its locking pin with the angle
arm in the bottom hole of the rear (middle) brackets of the PRRGL24TOP. Pin
the angle pin (4) through the ‘P’ marked hole in the angle frame (7) and align it
with the compression slot of the angle arm.

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5. Array configurations___________________________________________
Fly mode array assembling and hoisting
The numbers in the text below, correspond with the LR24 loudspeaker overview pictured earlier.
Shown on the right depicts
array building in Fly mode
style. Shown with 2 hoists, 1x
GRD24B and 8x LR24
cabinets.
Start removing the
PRRGL24TOP plateaus.
Attach the GRD24B to the first
cabinet on the PRRGL24 pack
(A). Keep all red pins in their
parking slots. Pull the angle
setting pins (4) out and set the
correct angles using the Fly
slot in the angle arm (5). These
angles are determined by the
Alcons Ribbon Calculator™
simulation program. Hoist the
first pack from the pre-rig (B).
Connect the necessary cabling
to the signal input/ link (6)
connectors. Use a sling from
the grid for a tension free cable
hang. Set the angles of the
second pack and place it under
the raised array and make a
connection with both front
couplers (2) (C). Connect the second set of cabling. Lower the hoists, and/ or pull the pre-rig backwards to close the rear opening between the cabinets. Then
the rear connection of the angle arm(5) to the bottom cabinet pin (8) can be made (D). Raise the whole array and angle it to the desired positions.
Use slow speed or speed-controllable chain hoists. Avoid any form of excessive dynamic loading to the array
assembly

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5. Array configurations___________________________________________
Storage PRRGL24 dollies
The dollies can be stored on top of each other, with or without the PRRGL24TOP plateaus.
Turn the pre-rig angle arm to the middle locking pin position and pin it. The PRRGL24 can
now be placed on top of each other. Turn all castor wheels inwards and place them inside the
C-shaped holders on the frame.
When PRRGL24TOP’s are used, place each plateau onto the dolly frame and pin it through
the rear hole of the dual hole bracket
Landing the array in fly mode
Lower the array to working height and connect a pre-rig to the bottom
cabinet with its angle arm first. Let the bottom pack compress and
demount the rear connection. Undo all cabling, and turn the angle arms
inwards and lock, if desired. Decouple the front couplers and lower the
next pack onto the pre-rig. Turn the pre-rig angle arm in the upright
position and lock it with its pin. Front cabinet couplers to the back holes of
the dual hole bracket. Let the cabinets compress into a curved pack.

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5. Array configurations___________________________________________
Compression mode array assembling and hoisting
This description features an 8 piece array connected to GRD24B
This flying option is best suited for small 4->12 pcs arrays. The cabinets are transported in a straight pack. The red buttoned pin (9) 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”.
9
4

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5. Array configurations___________________________________________
Take the top cabinet angle arm out of the transport position and put the red pin (9) in.
Choose the angles of al cabinets by aligning the angle pin (4) with the bottom compression fly slot in the angle arm (5).
The angle setting can be done at the warehouse or on-site. There will be pressure on the red pin (9) when adjusting the angle arm (5).
A slight push/ tilt against the overlying cabinet will also help to ease this pressure.
When the first cabinets are ready, attach GRD24B to the top cabinet (A). Attach the audio cabling and use a hoist sling to take the weight of
the speaker cables
Attach a manual 0,75T lever hoist, with overload protection, from the bottom 3.25T shackle position on the GRD24B. 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 PRRGL24 off when the first pack is suspended. Remove all the red buttoned 0° pins (9) and place them in the rubber lined
parking holes
Position the next PRRGL24 pack under the suspended array (C). Ensure that all 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 (D), pull out all red buttoned pins (9).
Continue this procedure until full array length is reached.
End with attaching the PBFRML24 under the lowest cabinet. Mount the frame onto the front couplers (2) and lock with their pins. Make the
connection with the lower cabinet connecting pin (8) and lock it (D)
Start hoisting the (lever) hoist to set the cabinet angles (E). 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 GRD24B.

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5. Array configurations___________________________________________
Landing the array compression mode
De-compress the cabinets to 0° by releasing the tension of the lever hoist. The whole array should now be hanging vertical. Remove the PBFRML24 and attach
the PRRGL24 pre-rig. This is a two man job. The pre-rig angle arm is not locked with its pin, but is connected directly to the bottom cabinet connection.
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 for all other cabinets.
Use slow speed or speed-controllable chain hoists. Avoid any form of excessive dynamic loading to the array
assembly
Using CNVB1824
Attach the CNVB1824 frame to the LR24 front couplers (2) and
bottom connection pin (8). Make the angle adjustments on the
LR18 modules. Lower the LR24 array onto the top LR18 module
on the Pre rig. You can, of course, also mount individual LR18
modules to the LR24 array. Mount the LR18 front couplers to
the inside points of the CNVB1824 and pin it. Take out the LR18
angle arm and mount it to the rear mounting point of the
CNVB1824 and pin with the red pin through the slot of the angle
arm. Raise the LR24 array and make the necessary cable
connections.

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5. Array configurations___________________________________________
Ground stacking PRRG
This description features a 4 piece ground stacked array on a PRRGL24. This is the preferred way of stacking which requires no manual lifting.
Make sure that the array is assembled on a flat and stable surface
Begin by positioning PRRGL24 to the desired location. Ensure that the centre of gravity will be well
within the mounting base. This can be determined by the Alcons Ribbon Calculator™ simulation
program.
In most cases a pack of LR24’s is sufficient. In this case the system will be in compression mode,
with the red pins on the angle frame. Set all angles to the desired setting.
Mount the stack feet to each corner of the PRRGL24. The slide tube can be inserted in both ends of
the stack foot base bracket and is then locked with a pin at the desired length position. In this way a
left or right assembly can be made.
Turn the levelling foot down to the ground plane.
Hold or push the LR24 cabinets in their vertical position and pull out the red pin on the bottom
cabinet. This is a two man job.
Let the cabinets compress again until the angle is reached. Work your way up.
If the stacked pre-rig needs to be level, turn the levelling feet down to where there is no more slack in
the assembly. It is not necessary to lift the entire PRRGL24 off the ground
When the complete angled array needs to be tilted, adjust the levelling feet accordingly and use the
front or back castor wheels as pivoting point so they will take much of the weight.

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5. Array configurations___________________________________________
Ground stacking GRD24B
This description features a 4 piece ground stacked array on a GRD24B (e).
Make sure that the array is assembled on a flat and stable surface
Begin by positioning the GRD24B at the desired location. Ensure that the centre of gravity will be well within
the mounting base. This can be determined by the Alcons Ribbon Calculator™ simulation program.
Start disassembling an LR24 pack on a PRRGL24 or use single LR24’s. Turn the cabinets 180° in the vertical
plane and connect the first one to the GRD24B.
You can choose between a 0° or -2.7° angle between LR24 and GRD24B.
The system needs to be in compression mode. Set all angles to the desired setting using the Compression fly
slot. This is a two man job.