OHM CORA Series User manual

FRONT
LINKS
GROUNDSTACK
FRONT LINK
STORAGE
LOCK
-
-
-
CORA
Series
Rigging
Manual
Manchester - England
Version 7.0 01/02/2019

Manchester - England
Version 7.0 01/02/2019
2
1. Introduction to CORA .....................................................................................
2. Safety ..............................................................................................................
2.1. General safety .......................................................................
2.2. Load capacity .......................................................................
2.3. Wind load..............................................................................
2.4. Operation ...............................................................................
2.5. pro-A-sync simulation software ..........................................
3. CORA Array Frame ..........................................................................................
3.1. Introduction ...........................................................................
3.2. Array frame hardware ..........................................................
3.3. Suspension of the array frame ............................................
3.4. Single pickpoint operation ..................................................
3.5. Dual pickpoint operation .....................................................
3.6. Secondary safety points ......................................................
3.7. Cable pick .............................................................................
4. CORA Array setup ...........................................................................................
4.1. Preparation ............................................................................
4.2. CORA array rigging mechanism ...........................................
4.3. Flown arrays ..........................................................................
4.4. CORA/CORA active ...............................................................
4.5. CORA-S ................................................................................
4.6. Flying a mixed CORA array ...................................................
4.7. Ground stacking the CORA array .........................................
4.8. CORA flightcases ..................................................................
5. Safety Checks .................................................................................................
5.1. Mechanical safety .................................................................
5.2. System wiring .......................................................................
5.3. Signal test .............................................................................
6. Flying the Array ..............................................................................................
6.1. Hoisting the array .................................................................
6.2. Making safe at height ...........................................................
7. Derigging the Array ........................................................................................
7.1. General Information ..............................................................
7.2. Flightcasing the array ...........................................................
8. Care and Maintenance ...................................................................................
8.1. Visual inspection ..................................................................
8.2. Transportation ......................................................................
9. Technical Specifications ................................................................................
9.1. CORA array ............................................................................
9.2. CORA-A array ........................................................................
9.3. CORA-S ..................................................................................
10. Manufacturers declaration ..........................................................................
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Contents

FRONT
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGELOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AF CORA ARRAYFRAME - Weight 27 kg
Engineeredand manufactured in the UK
STORAGE
FRONT
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONT LINK
STORAGE
LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
3
1. Introduction to CORA
CORA is a high power lightweight compact line array for use in medium throw applications.
With a dispersion of 100° x 12° and up to 100° x 90° in an array configuration of 9 boxes,
it is capable of 158 dB peak SPL. CORA hardware and its associated components
should only be used in conjunction with Ohm CORA line array and CORA-S subwoofer
loudspeakers as described in this manual.

Manchester - England
Version 7.0 01/02/2019
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2. Safety
2.1. General Safety
Installation and setup of CORA arrays should be carried out by an Ohm qualified
technician.
The technician responsible should ensure that all flying points and suspensions are
suitable for their intended use and pass rigging inspection and safety tests.
All equipment should be inspected for quality before use. If any of the CORA
loudspeakers or associated rigging appear faulty please withdraw these from use
and contact Ohm for repair.
2.2. Load Capacity
The C-AF (CORA array frame) is designed to suspend a maximum total load of…
• 8 x CORA-S: 333.40 kg (including flying frame but no cabling)
Or…
• 12 x CORA array: 283.80 kg (including flying frame but no cabling)
Or…
• 2 x CORA-S and 8 x CORA array: 266.40 kg (including flying frame but no cabling)
2.3. Wind Load
Flying loudspeakers outside in wind conditions higher than 6 ft (22-27 knots, 39-49
km/h, 25-31 mph) is not recommended. If the wind force exceeds this lower and
secure the array.
WARNING!
Potential risk of personal injury and material damage!

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Version 7.0 01/02/2019
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2.5. pro-A-sync Simulation Software
Ohm line arrays must be designed using Ohm’s pro-A-sync simulation software.
For optimal alignment, deployment and safety we recommend all users attend one
of Ohm’s regularly hosted line array training seminars. Details of Ohm’s training
seminars can be found on the Ohm website at www.ohm.co.uk
pro-A-sync software is available as a standalone software package for both
macOS and Windows based operating systems. Download from: www.ohm.co.uk/
downloads/
2.4. Operation
CORA array should always be assembled using 2 people, one on either side of
the array.
During assembly pay attention to the risk of crushing hands and fingers in
between cabinets.
Ensure all array pins are seated correctly when building the array.
When arrays are being hoisted under no circumstances stand underneath the
array or in the vicinity of the load.
Do not climb on the array.
Wear suitable PPE.

FRONT LINKS
REAR LINKS
GROUNDSTACK
SPLAYLINK
GROUNDSTACK
FRONT LINK
STORAGE LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
FRONT LINKS
REAR LINKS
GROUNDSTACK
SPLAYLINK
GROUNDSTACK
FRONT LINK
STORAGE LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
6
3. CORA Array Frame
3.1. Introduction
The CORA array frame (C-AF) is designed to suspend or ground stack arrays
consisting of:
CORA line array:
CORA-A active line array:
CORA-S:
A mix of CORA-S and CORA/CORA-A line array.
CORA array frame (C-AF)
630 mm
572 mm
416.34 mm
628 mm
84.6 mm 188.55 mm
Secondary
safety mount 4
off positions
Secondary
safety mount 4
off positions
Flying pick
points 1-13
Cable pick
points x 2
Rear link point
(flying and ground stacking
CORA-S)
Front link
locking pin hole
Frame front
Frame front
Front link
(ground stacking CORA/
CORA-A array)
Front link
storage
Rear splay
link storage.
Rear splay link
(ground stacking
CORA/CORA-A array)
Rear splay link pin
points. (Flying CORA/
CORA-A array)
Front link point 2
(flying CORA/CORA-A array & CORA-S
and ground stacking CORA-S)
Front link point 1
(flying CORA-S)
Front view groundstack links in the up position
Rear view groundstack links in the down position and
cable pick positions.

FRONT LINKS
REAR LINKS
GROUNDSTACK
SPLAY LINK
GROUNDSTACK
FRONT LINK
STORAGE LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
FRONT LINKS
REAR LINKS
GROUNDSTACK
SPLAY LINK
GROUNDSTACK
FRONT LINK
STORAGE LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
7
3.2. Array Frame Hardware
The array frame is equipped with all the necessary attachments to allow flying or
ground stacking of CORA/CORA-A. No additional hardware is required to build flown
array hangs of either CORA/CORA-A or CORA-S.
On either side of the frame a front link and a splay link are built into the frame for
ease of ground stacking. These links rotate from within the frame and can be locked
in place using the locking pin attached to each side of the frame. When flying the
array the links remain inside the frame and locked in the storage holes using the
same locking pins.
Front link point 2
(flying CORA/CORA-A array & CORA-S
and ground stacking CORA-S)
Rear link point
(flying and ground stacking CORA-S)
Front link locking
pin hole
Frame
front
Frame
front
Front link
(ground stacking
CORA/CORA-A array)
Front link
storage
Rear splay link
storage.
Rear splay link
(ground stacking CORA/
CORA-A array)
Rear splay link pin
points.(Flying CORA/
CORA-A array)
Front link point 1
(flying CORA-S)

REAR
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONT LINK
STORAGE
LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
8
3.3. Suspension of the Array Frame
The Flying Frame has a central bar complete with 13 pickpoint holes.
The pickpoint required will depend on the load, angle and deployment of the array in
question (single or dual pickpoint operation). To determine the correct pickpoint it is
recommended to use Ohm’s pro-A-sync simulation software. Failure to do so could
result in a flown array that is not safe, incorrectly aligned for the venue or space you
are working in, or acoustically incoherent.
C-AF showing 13 pickpoint positions
Frame
front
Frame
rear
1
2
3
4
5
6
7
8
9
10
11
12 13

REAR
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONT LINK
STORAGELOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
9
3.4. Single Pickpoint Operation
When using a ‘single pickpoint’ the position of the pickpoint is determined by
using Ohm’s pro-A-sync simulation software. A one tonne shackle must be used in
conjunction with a half metre wire sling to ensure that the chain bag of the hoist
being used does not foul on the top of the array frame.
The target angle of the array is achieved when the array is fully hoisted as intended.
C-AF showing single pick point
using pickpoint 7.
Master link
connected to hoist
Pickpoint (determined by pro-
A-sync software)
Wire sling (0.5m)
Shackle (1 tonne)
Shackle (1 tonne)
1
2
3
4
5
6
7
8
9
10
11
12 13

REAR
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONT LINK
STORAGE
LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
10
3.5. Dual Pickpoint Operation
With ‘dual pickpoint’ operation, the vertical alignment of the array is determined by
trimming the hoist motors after the array has been fully assembled and lifted to it’s
operating trim height.
Pickpoint hole 1 and 13 are used in dual pickpoint operation and the angle of the
array calculated using Ohm pro-A-sync. For optimum array vertical alignment an
inclinometer should be attached to the frame and the measuring device operated
from floor level.
Two shackles (one tonne) must be used in conjunction with wire slings (0.5m) to
ensure that the chain bags of the hoists being used do not foul on the array frame.
Additional weight on the array frame can adjust the array’s angle and overall weight
so careful deployment is essential.
C-AF showing dual pick points
using pickpoints 1 & 13.
Wire sling (0.5m)
Shackle (1 tonne)
Shackle (1 tonne)
Master link connected
to hoist
Pickpoint
(determined
by pro-A-sync
software)
1
2
3
4
5
6
7
8
9
10
11
12 13

FRONT
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONT LINK
STORAGE LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAYFRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
11
3.6. Secondary Safety
Four x 45° steel tabs at the front and back corners of the array frame allow for a
secondary point of safety. The secondary rigging point should be independent of the
main rigging point and must be capable of supporting the entire load.
From each safety point on the frame one tonne shackles must be used attached to
wire slings to form an equilateral triangle maintaining the maximum sling angle of
60°. A further two shackles must be used on the other end of the wire slings and then
attached to a load ring, and from there to the secondary safety point in the venue or
tower that the array is suspended from.
C-AF showing secondary fix.
Shows 45° steel tab
Secondary fix.
Four x 45° steel tab for
secondary fix positions.
Two wire slings (0.5 m),
maximum sling angle 60°
Two shackles
(1 tonne)
Two shackles
(1 tonne)
Master link connected
to hoist
3.7. Cable Pick
On the rear of the frame 2 x 10 mm holes are positioned for use with 10 mm eyebolts
as cable picks. When flying CORA-S these can be utilised for cable strain relief. When
flying CORA/CORA-A array the motor point should be used for strain relief so that the
arrays angle is not compromised.
Cable Pick (2 x 10 mm
holes)

Manchester - England
Version 7.0 01/02/2019
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4. CORA Array Setup
4.1. Preparation
Before you fly or ground stack the array you must design the array using Ohm’s
pro-A-sync simulation software. This ensures correct acoustical and mechanical
deployment of the array.
PDF’s can be generated from within the software and printouts made to assist the
riggers with the suspension points, chain hoists and pick/pin points.
Inspection before setup:
Clear the working area before setting up and lifting the array.
Check the condition of the chain hoists, their positions and ensure chains are not
twisted.
Visually inspect all the loudspeaker cabinets and their associated rigging. Any
damaged components must be withdrawn from use immediately.

Manchester - England
Version 7.0 01/02/2019
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4.2. CORA Array Rigging Mechanism
CORA/CORA-A Array
The front top links are located within the cabinet side cheeks. By factory default the
front links are in the storage position. Once the pins are removed the links can be
pushed upwards and the pins replaced in the top holes allowing a cabinet above to
be attached.
The pin holes on the bottom of the cabinet at the front are for connecting front links
from cabinets below.
The splay links on the rear of the cabinet at the top by default are in the storage
position. Removal of the pins here allows the splay links to rotate upwards to be
connected to the correct alignment hole in the cabinet above according to Ohm’s pro-
A-sync software.
On the bottom of the cabinet in the rear the pin holes are for connecting the splay
links from the cabinet below.
Front top link
Rear splay link
Pin A
Remove pin A
from the front top
link. Slide the link
upwards and replace
the pin.
Remove pin B from the rear
splay link, This allows the
rear splay link to rotate out
ready to be located in either
the frame or the cabinet.
Pin B
Pin C
Further instructions of this
procedure are on page (16)
Factory default link positions

Manchester - England
Version 7.0 01/02/2019
14
CORA-S
CORA-S utilises separate steel sub links to connect the subwoofer to the array frame
or one CORA-S to another CORA-S. Inserting a steel sub link in each corner of the
subwoofer allows the connection of the frame on the top or bottom of the cabinet.
For mixed arrays of CORA/CORA-A array and CORA-S, two array frames must be used
where CORA/CORA-A array cabinets are flown beneath CORA-S. CORA-S must only
be deployed at the top of the array and should not be used within clusters of CORA/
CORA-A array loudspeakers in one array hang.
Pin A
Pin B
CORA-S array
frame section
Steel sub link
Remove pin B
from the steel
sub link.
Remove pin B from the steel
sub link. Locate the steel sub
link over the top of CORA-S
array frame section
Place steel sub link
into the CORA array
frame section lining up
the holes.
Replace pin B into the hole on the
CORA array frame section and
through the steel sub link.
Repeat procedure above on all four corners of the CORA-S, the sub is now ready to connect to the array
frame or other CORA-S as per instructions on page (18)
1
3
2

FRONT
LINKS
GROUNDSTACK
SPLAYLINK
GROUNDSTACK
FRONT LINK
STORAGE LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineered and manufactured in the UK
STORAGE
6°
4°
2°
0°
- 2°
- 4°
- 6°
Manchester - England
Version 7.0 01/02/2019
15
4.3. Flown Arrays
Flown arrays are suspended using the C-AF (CORA Array Frame)
Once you have chosen the correct type of suspension for your application (single or
dual pickpoint) attach the rigging to the frame (as described in chapter 3.4. – 3.5.
single/dual pickpoint).
At this point it is recommended that you attach a secondary safety device to the
frame before attaching any cabinets (as described in chapter 3.6. Secondary Safety).
Prepare the correct amount of cables and link cables according to the system setup
(number of cabinets and amplifiers used).
C-AF showing single hang point at
pickpoint 7 with secondary safety.

FRON
T
LINKS
REAR
LINKS
GROUNDST
ACK
SPL
AY
LIN
K
GROUNDST
ACK
FRONT LINK
ST
ORAG
E
LOCK
6°
4°
2°
0°
- 2°
- 4°
- 6°
C-AF CORA
ARRA
Y
FRAME -
We
ight 27 kg
Engineered and manufactured in the UK
ST
ORAG
E
6°
4°
2°
0°
- 2°
- 4°
- 6°
6°
4°
2°
0°
- 2°
- 4°
- 6°
Manchester - England
Version 7.0 01/02/2019
16
4.4. CORA/CORA-A
CORA and CORA-A share the same physical size and rigging hardware.
Prepare the first cabinets rigging hardware (as described in chapter 4.2. CORA Array
Rigging Mechanism). Lower the frame onto the cabinet until the front links line up
with the flying link holes on the frame and insert the locking pins of the frame on
each side. Using the data from Ohm’s pro-A-sync software rotate up the rear splay
links of the cabinet and align them with the correct pin points on the frame. Insert the
locking pins on each side of the frame.
Add further cabinets using the same procedure as above. Raise the frame with the
first cabinet attached and then lower onto the next cabinet and repeat the process.
Connect the speaker lines (CORA) or power and signal (CORA-A) according to the
number of amplifier channels and cabinets used.
Make sure to connect the cabling before the top of the array becomes out of reach.
Use the cable pick on the frame to choke and suspend the cabling without putting
any unwanted stress on the cabinets connectors.
Before hoisting the array to the desired trim height recheck the entire array including
its locking pins, splay angles, power and signal/speaker cabling. (Refer to chapter 5.
System safety checks).
Rear splay link
Pin B
Pin A
Pin C
Pin D
Rear splay hole
positions
Front top link
Hole position
Once prepared lower the frame until
the front top links of the cabinet are
able to slide into position.
If not already done, remove pin B from
rear splay link.
With the holes lined up lock in into
place using pin D from the frame.
Using thumb hole on rear splay link
rotate upwards ready to be positioned
on the rear splay link holes on the
frame.
1
3
2
4

FRONT
LINKS
REAR
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGE
LOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineeredandmanufactured in the UK
STORAGE
FRONT
LINKS
REAR
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGE
LOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AF CORA ARRAYFRAME - Weight 27 kg
Engineeredand manufactured in the UK
STORAGE
FRONT
LINKS
REAR
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGE
LOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AF CORA ARRAYFRAME - Weight27 kg
Engineeredandmanufactured in the UK
STORAGE
6°
4°
2°
0°
- 2°
- 4°
- 6°
Manchester - England
Version 7.0 01/02/2019
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Once positioned in to the correct
hole as predicted via the pro-A-sync
software lock into place using pin B
Raise the array ready
to take the next
prepared cabinet.
Place cabinet below.
Remove pin C from top cabinet,
lower the frame until the front top
links of the lower cabinet are able
to slide in to position on the higher
cabinet.
Push the front top link in to the slot on
the bottom of the higher cabinet until
the holes line up.
With the holes lined up lock in into
place using pin C from the top cabinet.
If not already done, remove
pin B from rear splay link.
Using thumb hole on rear splay link
rotate upwards and position on
the rear splay link holes on the top
cabinet.
Once positioned in to the correct
hole as predicted via the pro-A-sync
software lock into place using pin B Continue to connect
boxes following the
same procedure until the
required amount of array
has been added.
5
6
7
9
12
10 11
8

FRONT
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGE
LOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineeredand manufactured in the UK
STORAGE
FRONT
LINKS
FRONT
LINKS
FRONT
LINKS FRONT
LINKS
Manchester - England
Version 7.0 01/02/2019
18
4.5. CORA-S
Prepare the first cabinets rigging hardware (as described in chapter 4.2. CORA
Array Rigging Mechanism). Lower the frame onto the cabinet until the front and rear
sub steel links line up with the flying link holes on the frame and insert the locking
pins from the cabinet on each side.
Add further cabinets using the same procedure as above. Raise the frame with the
first cabinet attached and then lower onto the next cabinet and repeat the process.
Connect the speaker lines according to the number of amplifier channels and
cabinets used.
CORA-S shares the same symmetrical footprint whether the cabinet is front facing or
rear facing. No adjustment to the cabinet rigging is required for mixed front facing/
rear facing set-ups. Cardioid sub arrangements can be deployed easily with this in
mind. The cabinet is also fitted with speakON
®
connectors front and back for ease of
cable management.
Before you start prepare the sub links
and fit to the top of the CORA-S.
Lower the frame using the hoist over
the first CORA-S.
Remove the pins from the top of the
sub links on the CORA-S if not already
done so.
Lower the frame onto the sub links
and line up the holes.
Once in position replace the pins
through the frame and the sub links.
1
3
2
4

FRONT
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGE
LOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AF CORA ARRAY FRAME - Weight 27 kg
Engineeredand manufactured in the UK
STORAGE
Manchester - England
Version 7.0 01/02/2019
19
Add additional subs as follows
Position the frame and CORA-S using
the hoist over the additional CORA-S.
Remove the pins from the top of the
sub links on the lower CORA-S if not
already done so.
Lower the array onto the sub links and
line up the holes.
Once in position replace the pins
through the CORA-S rigging and the
sub links.
5
6
7
8

FRONT
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGE
LOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AFCORA ARRAY FRAME - Weight 27 kg
Engineeredand manufactured inthe UK
STORAGE
FRONT
LINKS
GROUNDSTACK
SPLAY
LINK
GROUNDSTACK
FRONTLINK
STORAGE
LOCK
6°
4°
2°
0°
-2°
-4°
-6°
C-AF CORA ARRAYFRAME - Weight 27 kg
Engineeredand manufactured in theUK
STORAGE
Manchester - England
Version 7.0 01/02/2019
20
4.6. Flying a Mixed CORA Array
If CORA-S are to be flown in a mixed array these must always be positioned at the top
of the array column.
For a mixed setup two flying frames are required, one frame is used for the
suspension, the second frame is used beneath the subs to attach CORA/CORA-A
array cabinets. Prepare all the cabinets rigging hardware (as described in chapter
3.7. CORA Array Rigging Mechanism). An additional set of four steel sub links will be
required to attach the second frame beneath the lowest sub in the array.
to add CORA/CORA-A array follow
instructions from pages (16/17)
With the array in the air place
the sub link into the CORA-S
rigging frame.
Prepare the four sub links by removing
the top pin.
Replace the pins from the top of the
sub links Through the CORA-S frame
and the sub links securing them in
place.
If not already done so remove
the bottom pins from the sub
link
Replace the pins through the
frame and the CORA-S array sub
links.
Position the array on the frame
ensuring the holes are lined up.
9
12
13
10
11