Void ArcM-12 User manual

voidacoustics.com
ArcM-12
A sound engineers dream
USER GUIDE V2.0

©2022 Void Acoustics Research Ltd.
This user guide is subject to change without notice.
For the latest online version, visit: www.voidacoustics.com
Void Acoustics and the Void logo are registered trademarks of Void Acoustics
Research Ltd. in the United Kingdom, USA and other countries; all other Void
trademarks are the property of Void Acoustics Research Ltd.

UG10569-2.0 - ArcM-12 User Guide V2.0 Page 3
Contents
1 Safety and Regulations 4
1.1 Important Safety Instructions 4
1.2 Limitations 4
1.3 EC Declaration of Conformity 4
1.4 UKCA Conformity 4
1.5 Warranty Statement 4
1.6 WEEE Directive 4
2 Unpacking and Checking 5
3About 6
3.1 Welcome 6
3.2 ArcM-12 Overview 6
3.3 Key Features 6
3.4 ArcM-12 Specifications 7
3.5 Dimensions 8
4 Cable and Wiring 9
4.1 Electrical Safety 9
4.2 Cable Considerations for Fixed Installations 9
4.3 Wiring Diagram Passive Mode 9
4.4 Bias Q2 speakONTM wiring passive mode 10
4.5 Bias Q3/Q5 speakONTM wiring passive mode 10
4.6 Wiring Diagram Active Mode 11
4.7 Bias Q2 speakONTM wiring active mode 11
4.8 Bias Q3/Q5 speakONTM wiring active mode 12
5 Mounting 13
5.1 Installation Safety 13
5.2 Pole Mounting 14
5.3 Ceiling Mounting 15
6 Service 18
6.1 Return Authorisation 18
6.2 Shipping and Packing consideration 18
7 Appendix 19

Page 4UG10569-2.0 - ArcM-12 User Guide V2.0
1.1 Important safety instructions
The lightning flash with an arrowhead symbol
within an equilateral triangle is intended to alert the
user to the presence of uninsulated “dangerous
voltage” within the product’s enclosure that may
be of sucient magnitude to constitute a risk of
electric shock to persons.
The exclamation point within an equilateral triangle
is intended to alert the user of the presence of
important operating and maintenance (servicing)
instructions in the literature accompanying the
appliance.
Safety instructions - read this first
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with
the manufacturer’s instructions.
8. Do not install near any heat source such as radiators, heat
registers, stoves, or other such apparatus that produce heat.
9. Do not defeat the safety purpose of the grounding-type plug. A
grounding type plug has two blades and a third grounding prong.
The third prong is provided for your safety. If the provided plug
does not fit into your outlet, consult an electrician for replacement
of the obsolete outlet.
10. Protect power cords from being walked on or pinched
particularly at plugs, convenience receptacles, and the point where
they exit the apparatus.
11. Only use attachments and accessories specified by Void
Acoustics.
12. Only use with the cart, stand, tripod, bracket, or table specified
by the manufacturer, or sold with the apparatus. When a cart is
used, use caution when moving the cart/apparatus combination to
avoid injury from tip-over.
13. Unplug the apparatus during lightning storms or when unused
for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing
is required when the apparatus has been damaged in any way,
such as when the power-supply cord or plug is damaged, liquid
has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate
normally, or has been dropped.
15. Since the mains power supply cord attachment plug is used to
disconnect the device, the plug should always be easily accessible.
16. Void loudspeakers can produce sound levels capable of
causing permanent hearing damage from prolonged exposure.
The higher the sound level, the less exposure needed to cause
such damage. Avoid prolonged exposure to the high sound levels
from the loudspeaker.
1.2 Limitations
This guide is provided to help familiarise the user with the
loudspeaker system and its accessories. It is not intended to
provide comprehensive electrical, fire, mechanical and noise
training and is not a substitute for industry-approved training. Nor
does this guide absolve the user of their obligation to comply
with all relevant safety legislation and codes of practice. While
every care has been taken in creating this guide, safety is user-
dependent and Void Acoustics Research Ltd cannot guarantee
complete safety whenever the system is rigged and operated.
1.3 EC declaration of conformity
For EC Declaration of Conformity please go to:
www.voidacoustics.com/eu-declaration-loudspeakers
1.4 UKCA marking
For details of the UKCA marking go to:
www.voidacoustics.com/uk-declaration-loudspeakers
1.5 Warranty statement
For warranty statement go to:
https://voidacoustics.com/terms-conditions/
1.6 WEEE directive
If the time arises to throw away your product, please recycle all
the components possible.
This symbol indicates that when the end-user
wishes to discard this product, it must be sent
to separate collection facilities for recovery
and recycling. By separating this product from
other household-type waste, the volume of
waste sent to incinerators or land-fills will be
reduced and natural resources will thus be
conserved.
The Waste Electrical and Electronic Equipment Directive (WEEE
Directive) aims to minimise the impact of electrical and electronic
goods on the environment. Void Acoustics Research Ltd complies
with the Directive 2002/96/EC and 2003/108/EC of the European
Parliament on waste electrical finance the cost of treatment and
recovery of electronic equipment (WEEE) in order to reduce the
amount of WEEE that is being disposed of in land-fill sites. All of
our products are marked with the WEEE symbol; this indicates that
this product must NOT be disposed of with other waste. Instead
it is the user’s responsibility to dispose of their waste electrical
and electronic equipment by handing it over to an approved
reprocessor, or by returning it to Void Acoustics Research Ltd for
reprocessing. For more information about where you can send
your waste equipment for recycling, please contact Void Acoustics
Research Ltd or one of your local distributors.
1 Safety and Regulations

Page 5UG10569-2.0 - ArcM-12 User Guide V2.0
2 Unpacking and Checking
All Void Acoustics products are carefully manufactured and thoroughly tested before being
despatched. Your dealer will ensure that your Void products are in pristine condition before
being forwarded to you but mistakes and accidents can happen.
Before signing for your delivery:
• Inspect your shipment for any signs of contamination, abuse or transit damage as soon
as you receive it
• Check your Void Acoustics delivery fully against your order
• If your shipment is incomplete or any of its contents are found to be damaged; inform
the shipping company and inform your dealer.
When you are removing your ArcM 12 loudspeaker from its original packaging:
• ArcM 12 loudspeakers are boxed and stapled shut; take care when unboxing and removing
the staples to avoid injury or damage to the loudspeaker
• If you need to place the ArcM 12 loudspeaker on a flat surface ensure you use a lint free
product to protect the finish
• When you have removed the ArcM 12 loudspeaker from the packaging inspect it to ensure
there is no damage and keep all original packaging in case it needs to be returned for any
reason.
See section 1.5 for warranty conditions and see section 6 if your product needs servicing.

Page 6UG10569-2.0 - ArcM-12 User Guide V2.0
3 About
3.1 Welcome
Many thanks for purchasing this Void Acoustics ArcM 12 loudspeaker. We truly appreciate
your support. At Void, we design, manufacture and distribute advanced professional audio
systems for the installed and live sound market sectors. Like all Void products, our highly
skilled and experienced engineers have successfully combined pioneering technologies with
groundbreaking design aesthetics, to bring you superior sound quality and visual innovation. In
buying this product, you are now part of the Void family and we hope using it brings you years
of satisfaction. This guide will help you both use this product safely and ensure it performs to
its full capability.
3.2 ArcM 12 overview
The ArcM 12 has multiple working angles, allowing it to be used as a near field booth
monitor or conventional stage wedge, as well as having the ability to be pole mounted or
wall mounted for front-of-house purposes. In terms of mobility, measures have been taken
to reduce weight, while maintaining an ergonomic design to appease manual handling
requirements. Acoustically, FEA analysis has significantly reduced port noise and air distortion.
The 12” ArcM 12 is unpowered, allowing it to integrate with touring operators’ existing
infrastructure.
3.3 Key features
• High power 12” + 1.4’’ coaxial neodymium transducer
• Two wedge operating modes (stage and nearfield monitoring)
• Integral pole mount for 35 mm diameter poles
• Low profile design for cleaner stage lines
• Ergonomically designed handles for easy manual handling
• External dimensions optimised for truck packing
• Hard-wearing polyurea finish
• Type 80 rear mounting plate for wall or ceiling fixing

Page 7UG10569-2.0 - ArcM-12 User Guide V2.0
3 About
3.4 ArcM 12 specifications
Frequency response 60 Hz - 18 kHz ±3 dB
Eciency1100 dB 1W/1m
Crossover point 1k2Hz (acoustic)
Nominal impedance 1 x 8 Ωpassive, 1 x 8 Ω(LF) and 1 x 16 Ω(HF) active
Power handling2500 W AES
Maximum output3130 dB cont, 133 dB peak
Driver configuration Coaxial 1 x 12” - 1 x 1.4” neodymium
Dispersion 80°H x 80°V
Connectors 2 x 4-pole speakON™ NL4
Height 330 mm (13”)
Width 550 mm (21.7”)
Depth 463 mm (18.2”)
Weight 19 kg (41.9 lbs)
Rigging Integral top hat, type 80 mounting bracket
Finish Textured polyurethane
1Measured in half space 2AES2 - 1984 compliant 3Calculated
Figure 4.1: Horizontal directivity isobars
Figure 4.2: Vertical directivity isobars

Page 8UG10569-2.0 - ArcM-12 User Guide V2.0
3 About
550 (21.7")
323 (12.7")
209 (8.2")
463 (18.2")
75 (3")
75 (3")
4X M8 Fixtures
550 (21.7")
460 (18.1")
323 (12.7")
330 (13")
463 (18.2")
550 (21.7")
330 (13”)
Figure 4.3: Dimensions
3.5 Dimensions

Page 9UG10569-2.0 - ArcM-12 User Guide V2.0
4 Cable and Wiring
4.1 Electrical safety
To avoid electrical hazards please note the following:
• Do not access the inside of any electrical equipment. Refer servicing to
Void-approved service agents.
4.2 Cable considerations for fixed installations
We recommend specifying installation-grade Low Smoke Zero Halogen (LSZH) cables for
permanent installations. The cables should use Oxygen Free Copper (OFC) of grade C11000
or above. Cables for permanent installations should be compliant with the following standards:
• IEC 60332.1 Fire retardancy of a single cable
• IEC 60332.3C Fire retardancy of bunched cables
• IEC 60754.1 Amount of Halogen Gas Emissions
• IEC 60754.2 Degree of acidity of released gases
• IEC 61034.2 Measurement of smoke density.
We suggest using the following maximum copper cable lengths to keep level losses below 0.6 dB.
Metric mm2Imperial AWG 16 Ωload 8 Ωload 4 Ωload 2 Ωload
2.50 mm213 AWG 72 m 36 m 18 m 9 m
4.00 mm211 AWG 120 m 60 m 30 m 15 m
4.3 Wiring diagram passive mode
+
-
+
-
1+
1-
2+
2-
1+
1-
2+
2-
1+
1-
2+
2-
1+
1-
2+
2-
Passive
Crossover
In
Out/Link
1.4” HF 12” LF
Co-Axial
Figure 5.1: ArcM 12 passive mode wiring diagram
speakONTM pins 1+/1- speakONTM pins 2+/2-
In HF (1.4”) and LF (12”) Link/out
Out Link/out Link/out

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4 Cable and Wiring
4.4 Bias Q2 speakONTM wiring passive mode
1-
1+
1+
1-
Figure 4.2: Bias Q2
Bias Q2 Output 1 or 2
Output LF (12”) and HF (1.4”)
Max parallel units 4 (2 Ωload to amplifier)
4.5 Bias Q3/Q5 speakONTM wiring passive mode
Bias Q3/Q5 Single channel
Output LF (12”) and HF (1.4”)
Max parallel units 4 (2 Ωload to amplifier)
1+
1-
1+
1-
Figure 4.4: Bias Q5
1+
1-
1+
1-
Figure 4.3: Bias Q3

4.6 Wiring diagram active mode
+
-
+
-
1+
1-
2+
2-
1+
1-
2+
2-
1+
1-
2+
2-
1+
1-
2+
2-
In
Out/Link
1.4” HF 12” LF
Co-Axial
Figure 4.5: ArcM 12 active mode wiring diagram
speakONTM pins 1+/1- speakONTM pins 2+/2-
In LF (12”) HF (1.4”)
Out Link/out Link/out
4.7 Bias Q2 speakONTM wiring active mode
LF 1-
LF 1+
HF 2-
HF 2+
LF 1+
LF 1-
HF 2+
HF 2-
Figure 4.6: Bias Q2
Bias Q2 Output 1 Output 2
Output LF (12”) HF (1.4”)
Max parallel units 4 (2 Ωload to amplifier) 4 (4 Ωload to amplifier)
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4 Cable and Wiring

4.8 Bias Q3/Q5 speakONTM wiring active mode
LF 1+
LF 1-
MHF 2+
MHF 2-
LF 1+
LF 1-
HF 2+
HF 2-
Figure 4.8: Bias Q5
Bias Q3/Q5 Output 1 Output 2
Output LF (12”) HF (1.4”)
Max parallel units 4 (2 Ωload to amplifier) 4 (4 Ωload to amplifier)
LF 1+
LF 1-
MHF 2+
MHF 2-
LF 1+
LF 1-
HF 2+
HF 2-
Figure 4.7: Bias Q5
Page 12UG10569-2.0 - ArcM-12 User Guide V2.0
4 Cable and Wiring

Tools required
• 19 mm ratchet spanner/wrench
• 6 mm Allen key
5.1 Installation safety
To avoid mechanical hazards, please note the following:
• Safety regulations vary in dierent regions. Full compliance with those
regulations must be your priority
• Installations must only be undertaken by fully qualified and experienced
engineers/technicians who understand local regulations
• This may include consulting a structural engineer before installation of wall brackets
• Remember that all personnel have a duty of care to themselves, to their assistants, to
the venue sta and to the public
• Before lifting any part of the system above head height, check the whole rig for loose
tools or other items that may fall and cause injury
• Do not use a telephone (even if hands-free) whilst installing. Always concentrate fully on
the installation operation
• Do not install equipment that is worn, damaged, corroded, mishandled or over-
stressed in any way
• Use only Void-approved mounting equipment and accessories
• Secondary safeties should be provided in all instances where cabinets are flying or fixing
overhead and should conform to local regulations
Page 13UG10569-2.0 - ArcM-12 User Guide V2.0
5 Mounting

Step 2:
Lower the ArcM 12 loudspeaker on the pole
using the integrated top hat within the cup
handle. Rotate to the desired horizontal angle.
Parts required:
• 35 mm pole
Step 1:
Once the pole has been fitted to an
appropriate mount raise the ArcM 12
loudspeaker into position.
Figure 5.1: 35 mm pole
Figure 5.2: Loudspeaker positioning
Figure 5.3: Loudspeaker positioning
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5.2 Pole Mounting

Step 2:
Remove the mount plate from the T80 bracket
by removing the M10 nut as shown.
Parts required:
T80 - Ceiling Bracket
(350mm)
White - IT1106
Black - IT1105
Step 1:
Remove all four M8 countersink bolts from the
base of the ArcM 12.
Figure 5.4: Ceiling bracket
Figure 5.5: Bolt removal
Figure 5.6: Fixing bracket
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5.3 Ceiling Mounting

Step 3:
Attach the mounting bracket to the base of the
cabinet using all four bolts, spring washers and
washers provided with the bracket.
Step 4:
Attach the mounting plate to the ceiling
bracket
Figure 5.7: Mounting plate attachment
Figure 5.8: Ceiling bracket attachment
Page 16UG10569-2.0 - ArcM-12 User Guide V2.0
Step 5:
With the lifting gear in place adjust the angle
of the bracket using the bolt on the bracket
assembly.
Figure 5.9: Adjust angle
5.3 Ceiling Mounting

Page 17UG10569-2.0 - ArcM-12 User Guide V2.0
5.3 Ceiling Mounting
Step 6:
Tighten the bolt on the bracket to fix the
loudspeaker in position.
Figure 5.10: Loudspeaker positioning
Note:
It is possible to mount the ArcM loudspeaker
180° as shown in figure 7.9. Follow the
procedure detailed above.
Figure 5.11: Alternative mounting orientation

Page 18UG10569-2.0 - ArcM-12 User Guide V2.0
6 Service
Void ArcM 12 loudspeakers should only be serviced by a fully-trained technician.
No user serviceable parts inside. Refer servicing to your dealer.
6.1 Return authorisation
Before returning your faulty product for repair, please remember to get an R.A.N. (Return
Authorisation Number) from the Void dealer who supplied the system to you. Your dealer will
handle the necessary paperwork and repair. Failure to go through this return authorisation
procedure could delay the repair of your product.
Note that your dealer will need to see a copy of your sales receipt as proof of purchase so
please have this to hand when applying for return authorisation.
6.2 Shipping and packing considerations
• When sending a Void ArcM 12 loudspeaker to an authorised service centre, please write a
detailed description of the fault and list any other equipment used in conjunction with the
faulty product.
• Accessories will not be required. Do not send the instruction manual, cables or any other
hardware unless your dealer asks you to.
• Pack your unit in the original factory packaging if possible. Include a note of the fault
description with the product. Do not send it separately.
• Ensure safe transportation of your unit to the authorised service centre.

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7 Appendix
Architectural specification
The loudspeaker shall be a passive, two-way, bi-amped system consisting of one high power
12” (304.8 mm) direct radiating reflex loaded low frequency (LF) transducer and 1.4” (35.56
mm) exit diameter (HF) co-axially-mounted neodymium high frequency (HF) compression
transducer in a 15 mm birch ply enclosure.
The low frequency transducer shall be constructed on a cast aluminium frame, with a treated
paper cone, 88 mm (3.5”) voice coil, wound with aluminium wires on a high quality voice coil
former, for high power handling and long term-reliability. The high frequency transducer shall
be bolted through the rear of the magnet structure belonging to the LF transducer to form
a co-axial drive unit. The sound will project through a machined waveguide that exits in the
centre of the low frequency transducer to use the 203.2 mm (8”) bae diameter to achieve
pattern control and low distortion.
Performance specifications for a typical production unit shall be as follows: the usable on-axis
bandwidth shall be 60 Hz to 18 kHz (±3 dB) and shall average 80° directivity pattern for both
horizontal and vertical axis (-6 dB down from on-axis level) from 1 kHz to 12 kHz; maximum
SPL of 130 dB continuous, 133 dB peak measured at 1 m using IEC268-5 pink noise. Power
handling shall be 500 W AES at a rated impedance of 8 Ω; crossover point at 1.2 kHz using a
2nd order filter (12 dB per octave). The system shall be powered by its own dedicated power
amplification module with DSP management.
The enclosure shall be of a trapezoidal asymmetrical shape constructed from a 15 mm
13-laminate birch plywood with a textured polyurea finish and shall contain fixture points
for a pressed, weather-resistant, powder-coated steel grille with foam filter to protect the
transducers. The cabinet shall have an integral pole mount socket and a type 80 mounting
point to suit portable and permanent applications. External dimensions of (W) 550 mm x (H)
330 mm x (D) 463 mm (21.7” x 13” x 18.2”). Weight shall be 19 kg (41.9 lbs).
The loudspeaker shall be the Void Acoustics ArcM 12.

voidacoustics.com
NORTH AMERICA
Void Acoustics North America
Call: [phone]
Email: [email protected]
HEAD OFFICE
Void Acoustics Research Ltd,
Unit 15, Dawkins Road Industrial Estate,
Poole, Dorset,
BH15 4JY
United Kingdom
Call: [phone]
Email: [email protected]
Void Acoustics Research Limited is a company registered in England and Wales registration number 07533536