PROFESSIONAL SOUND SYSTEMSSIGMA Series
OPERATING MANUAL AND USER GUIDESIGMA-8 SIGMA-10 SIGMA-12 SIGMA-15 SIGMA-18B SIGMA-V4 SIGMA-V8

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TABLE OF CONTENTSIMPORTANT WARNINGS & SAFETY INSTRUCTIONS ....................................................................................... 1
SIGMA SERIES INTRODUCTION ........................................................................................................................ 2
KEY FEATURES .................................................................................................................................................... 2
INSTALLATION .................................................................................................................................................... 2
CONNECTIONS / WIRING .................................................................................................................................. 3
RIGGING / SUSPENDING ................................................................................................................................... 4
DIMENSIONAL DRAWINGS ................................................................................................................................ 5
SPECIFICATIONS ................................................................................................................................................. 8
WARRANTY.......................................................................................................................................................... 9

IMPORTANT WARNINGS & SAFETY INSTRUCTIONS•READ ALL INSTRUCTIONS - Become familiar with the features and functions of these products before operating
them.

•

COMPLY WITH ALL WARNINGS - All warnings and instructions for this product should be adhered to.

•

USE WITH AMPLIFIERS - In order to avoid damage to drivers and other equipment, it is advisable to establish
and follow a routine for powering up and powering down a sound system. With all system components
connected, turn on source equipment (mixers, signal processors, record and playback units, etc.) BEFORE
powering up ampliﬁers. Transient voltages from powering up source equipment can damage speakers if
ampliﬁers are already turned on. Make sure that ampliﬁer volumes are set to their minimum settings andpower up any system ampliﬁers LAST. It is recommended that all system components be allowed to stabilize forseveral seconds before any source signals are introduced or level setting adjustments are made. Similarly, when
shutting systems down, turn all ampliﬁers oﬀ ﬁrst, before powering down any other system components.

•

CABLES - Do not use shielded or microphone cable for connection between ampliﬁers and speakers. Use only
approved speaker cables with proper connectors.

•

RIGGING, SUSPENDING, AND MOUNTING - Suspending and mounting of these speaker systems can expose
members of the public to serious health risks and even death.
Under no circumstances attempt to rig, suspend or otherwise mount these speakers unless you are fully
qualiﬁed and certiﬁed to do so by relevant local, state and national authorities. All relevant safety regulations
must be followed. If you are not properly qualiﬁed or do not know of pertinent regulations, consult qualiﬁed
personnel for advice.

•

CAUTION - These professional loudspeaker systems are capable of generating very high sound pressure levels.
Use care with placement and operation to avoid exposure to exposure to excessive volume levels. Permanent
hearing damage can result when operated to extreme levels.

•

SERVICE-There are no user serviceable parts inside this product. Users should not attempt to service thisproduct. Warranty nulliﬁcation could result if this is attempted.

1

INTRODUCTION
Wharfedale Pro SIGMA Series are extreme power handling, ultra hardwearing loudspeakers in an aﬀordable
package built for a multitude of live sound applications. Our latest developments in loudspeaker technology
harness dual voice coil woofers reaching depths of 35Hz. These proprietary LF drivers are paired with 1.75”
Titanium Tweeters which throw high end to your crowd, while crossover points and acoustic charactaristics are
tuned by our experienced engineers for sonic accuracy. The cabinets adapt to multiple formations – M8 rigging
points, dual angle speaker poles and carry handles meet the varying demands of ﬁxed installation and touring with
our Rhino Rock ﬁnish and steel grilles providing protection for a lifetime of use.

KEY FEATURES
Very High SPL Output Capability
High Sensitivity & Dynamic Range
Custom 90 x 60 HF Waveguides
Custom High Output, Low Distortion Woofers
Custom Compression Drivers
Dual layer Voice Coils (Quad layer on SIGMA 18B)
Proprietary Rhino Rock Painted Enclosure
HF Protection Circuitry
Parallel Wired speakon Inputs
Dual Angle Pole Mount Receptacles (Excludes SIGMA 8)

INSTALLATION
Before attempting to install a SIGMA Series Loudspeaker system please refer to the important warnings and safety
instructions. Only qualiﬁed personnel should install a loudspeaker system.
Improper installation of a loudspeaker system can cause serious harm and even death if correct procedure is notfollowed. Anyone attempting installation assumes all liability arising from such use.
Speakers with dual angle pole mount sockets (SIGMA 10 / 12 / 15) have an sockets that angles the cabinet down by
10°.This allows more sound to be aimed directly at the audience and less at the ceiling, reducing early reﬂections.
Please ensure that the correct socket is used for each speaker.

2

CONNECTIONS/WIRING
Connecting the SIGMA Series to your system is easy. The input panel includes parallel Speakon connectors. Run
your speaker wires from your ampliﬁer to the speaker - you can use either input connector. Use the correct gaugeof stranded insulated speaker cable according to the power handling ability of your SIGMA Series cabinet. It isalways advisable to use heavier gauge (lower number) cables on longer runs. Be sure to connect your speakers inproper polarity (what many refer to erroneously, as phase).This means that in normal operation, connect one endof the same wire to the + or Red terminal on the ampliﬁer and the other end to the +1 on the NL4 Connector. The
other wire is connected to the-1 pin on the NL4 CONNECTOR. Be sure to use high quality, low gauge (thick) speaker
wire and NOT shielded cable.

SIGMA SERIES CONNECTION PANELSThe SIGMA Series loudspeakers feature parallel wire inputs. Either input can be used for a simple system and 2
speakers can be parallel wired using a standard speaker cable. When Parallel wiring loudspeakers always take inconsideration the load you are putting on your ampliﬁer. 2 parallel wired SIGMA loudspeakers will produce a 4
ohm load.

SIGMA-18B

SIGMA-15
POWER HANDLING:
350 Watts Continuous
700 Watts Program
1400 Watts Peak
Impedance: 8 Ohms

POWER HANDLING:
500 Watts Continuous
1000 Watts Program
2000 Watts Peak
Impedance: 4 Ohms

SIGMA-8/10/12/15 Rear Pannel

SIGMA-18B Rear Pannel

IMPORTANT NOTE
To avoid any possible damage to your amp and speakers, be sure to check the owner’s manual of your power
ampliﬁer to conﬁrm it is capable of operating at 2 ohms. The SIGMA 18B has a High Pass output. The high passallows you to connect a full range SIGMA loudspeaker and subwoofer to one ampliﬁer channel with 4 ohm load

3

RIGGING/SUSPENDING
All full range SIGMA enclosures (except SIGMA-18B) include multiple M8 rigging points for fast, safe and securesuspension.

Using Shoulder Eyebolts
Always apply the load to the bolt along the plane of the eye. For long term installation use a thread-locking
compound. Do not attempt to bend or otherwise deform any rigging hardware.

Please refer to the important safety warnings before you consider suspending any loudspeakers.

Each primary load bearing suspension point shall be rated for the total load.
(A minimum 5:1 Design Factor)

4

DIMENSIONAL DRAWINGSSIGMA-8

SIGMA-10

5

DIMENSIONAL DRAWINGSSIGMA-12

SIGMA-15

6

DIMENSIONAL DRAWINGSSIGMA-18B

7

DIMENSIONAL DRAWINGSSIGMA-V4

SIGMA-V88

SPECIFICATIONS
Model Name

SIGMA-8

SIGMA-10

System Type

Passive

PassiveConﬁguration

Two-way

Two-wayFrequency Response (+/-3 dB)

70 Hz - 18 kHz

65 Hz - 18 kHz

Frequency Range (- 10 dB)

65 Hz - 20 kHz

60 Hz - 20 kHz

Sensitivity (2.83 v / 1 m)

96 dB

97 dB

Calculated Maximum SPL @1 m

124 dB

126 dB

System Rated Impedance8Ω8Ω

Size (mm / inches)

203 mm / 8''

254 mm / 10''

Voice Coil Size (mm / inches)

38 mm / 1.5''

38 mm / 1.5''

Rated Impedance

8Ω

8Ω

LF Power (re:AES2-2012)

150 W

200 W

HF Driver Type

Compression DriverCompression Driver

Coil Size (mm / inches)

25 mm / 1''

44 mm / 1.75''

Exit Size (mm / inches)1"1"Diaphragm Material

Polymer

Titanium

Rated Impedance

8Ω

8Ω

HF Power (re:AES2-2012)

25 W

40 W

Nominal Coverage (H x V)

90° x 60°

90° x 60°

System Continuous Power

150 W

200 W

System Programme Power

300 W

400 W

System Peak Power

600 W

800 W

Crossover frequency

2.8 kHz

2.4 kHz

Input Connector

2 x NL4 (speakON compatible)

2 x NL4 (speakON compatible)

Hardware:

35 mm pole socket
M8 x 5
1 Handle on backDual-angle (0° or 10°) 35 mm pole socket
M8 x 5
1 Handle on backLow Frequency Transducer

High Frequency Transducer

Power

Enclosure
Enclosure Material

12 mm MDF

15 mm MDF

FinishBlack Paint / White Paint

Black Paint / White Paint

Grille Material & Finish

1.2 mm steel, painted

1.2 mm steel, painted

Height

430 mm / 17"

500 mm / 19.5"

Width Front

272 mm / 11"

383 mm / 13.3"

Width Rear

158 mm / 6"

213 mm / 8.4"

Depth

277 mm / 13.5"

339 mm / 13.3"

Height505 mm / 20"585 mm / 23"

Width Front

363 mm / 14.25"

451 mm / 18"

Width Rear

196 mm / 7.71"

254 mm / 10"

Depth

322 mm / 12.75"

384 mm / 13.3"

Net Weight

7.8 kg / 17 lbs

15.4 kg / 34 lbs

Gross Weight

8.8 kg / 19 lbs

17.8 kg / 38.5 lbs

Dimensions - Unpacked

Dimensions - Packed

9SPECIFICATIONS
Model Name

SIGMA-12

SIGMA-15

System Type

Passive

PassiveConﬁguration

Two-way

Two-wayFrequency Response (+/-3 dB)

60 Hz - 18 kHz

50 Hz - 18 kHz

Frequency Range (- 10 dB)

55 Hz - 20 kHz

45 Hz - 20 kHz

Sensitivity (2.83 v / 1 m)

98 dB

98 dB

Calculated Maximum SPL @1 m

129 dB

129 dB

System Rated Impedance8Ω8Ω

Size (mm / inches)

305 mm / 12''381 mm / 15''

Voice Coil Size (mm / inches)

64 mm / 2.5''

64 mm / 2.5''

Rated Impedance

8Ω

8Ω

LF Power (re:AES2-2012)

300 W

350 W

HF Driver Type

Compression DriverCompression Driver

Coil Size (mm / inches)

44 mm / 1.75''

44 mm / 1.75''

Exit Size (mm / inches)1"1"Diaphragm Material

Titanium

Titanium

Rated Impedance

8Ω

8Ω

HF Power (re:AES2-2012)

40 W

40 W

Nominal Coverage (H x V)

90° x 60°

90° x 60°

System Continuous Power

300 W

350 W

System Programme Power

600 W

700 W

System Peak Power

1200 W

1400 W

Crossover frequency

2.2 kHz

2.2 kHz

Input Connector

2 x NL4 (speakON compatible)

2 x NL4 (speakON compatible)

Dual-angle (0° or 10°) 35 mm pole socket
M8 x 5
2 Handles on sideDual-angle (0° or 10°) 35 mm pole socket
M8 x 5
2 Handles on side

Enclosure Material

15 mm MDF

15 mm MDF

FinishBlack Paint / White Paint

Black Paint / White Paint

Grille Material & Finish

1.2 mm steel, painted

1.2 mm steel, painted

Height

537 mm / 21"635 mm / 25"

Width Front

354 mm / 14"

435 mm / 17"

Width Rear

218 mm / 8"

261 mm / 11.7"

Depth

359 mm / 14"

439 mm / 17.25"

Height

625 mm / 24.6"

720 mm / 28.35"

Width Front

468 mm / 18.4"

553 mm / 21.75"

Width Rear

260 mm / 10.2"

303 mm / 12"

Depth

404 mm / 15.9"

488 mm / 19.2"

Net Weight

18.2 kg / 40 lbs

23.4 kg / 51.5 lbs

Gross Weight

20.9 kg / 45 lbs

26.7 kg / 58.7 lbs

Low Frequency Transducer

High Frequency Transducer

Power

Hardware:Enclosure

Dimensions - Unpacked

Dimensions - Packed

10SPECIFICATIONS
Model Name

SIGMA-18B

SIGMA-V4

SIGMA-V8

System Type

Passive

Passive

PassiveConﬁguration

subwoofer

Full Range

Full Range

Frequency Response (+/-3 dB)

35 Hz-250 HZ

160 Hz - 17 KHz

130 Hz - 17 KHz

Frequency Range (- 10 dB)

30 Hz-250 HZ

150 Hz - 20 KHz

120 Hz - 20 KHz

Sensitivity (2.83 v / 1 m)

100 dB

95 dB

97 dB

Calculated Maximum SPL @1 m

133 dB

123 dB

128 dB

System Rated Impedance

4Ω

8Ω

8Ω

Low Frequency Transducer
Size (mm / inches)

457 mm / 18''

4 x 75 mm / 3"

8 x 75 mm / 3"

Voice Coil Size (mm / inches)

64 mm / 2.5''

33 mm / 1.3"

33 mm / 1.3"

Rated Impedance

4Ω

8Ω

4Ω

LF Power (re:AES2-2012)

500 W

40 W

40 W

HF Driver Type

na

na

na

Coil Size (mm / inches)

na

na

na

Exit Size (mm / inches)

na

na

na

Diaphragm Material

na

na

na

Rated Impedance

na

na

na

HF Power (re:AES2-2012)

na

na

na

Nominal Coverage (H x V)

na

160° x 40°

160° x 30°

High Frequency Transducer

Power
System Continuous Power

500 W

150 W

300 W

System Programme Power

1000 W

300 W

600 W

System Peak Power

2000 W

600 W

1200 W

Crossover frequency

150 Hzna

na

Input Connector

2 x NL4 (speakONcompatible)

1 x NL4 (speakONcompatible)

1 x NL4 (speakONcompatible)

Hi Pass output connector

1 x NL4 (speakONcompatible)

Hardware:

35 mm pole socket
4 Handles on sides

BracketBracket18 mm MDF

12 mm MDF

12 mm MDF

Enclosure
Enclosure Material
FinishBlack Paint / White Paint

Black Paint / White Paint

Black Paint / White Paint

Grille Material & Finish

1.2 mm steel, painted

1.2 mm steel, painted

1.2 mm steel, painted

554 mm / 21.25"

445 mm / 17.5"805 mm / 31.7"

Dimensions - Unpacked
HeightWidth Front

502 mm / 20"

116 mm / 4.6"

116 mm / 4.6"

Width Rear

502 mm / 20"

85 mm / 3.3"

85 mm / 3.3"

Depth

780 mm / 30.8"

115 mm / 4.5"

115 mm / 4.5"649 mm / 25.5"

520 mm / 20.5"880 mm / 34.5"

Dimensions - Packed
HeightWidth Front

588 mm / 22.75"

220 mm / 8.7"

220 mm / 8.7"

Width Rear

588 mm / 22.75"

220 mm / 8.7"

220 mm / 8.7"

Depth

865 mm / 34"

220 mm / 8.7"

220 mm / 8.7"

Net Weight

39.1 kg / 86 lbs

3 kg / / 6.6 lbs

5.6 kg / 12.32 lbs

Gross Weight46.4 kg / 102 lbs

3.6 kg / 8 lbs

6.6 kg / 14.2 lbs

11SPECIFICATIONS: ENGINEERING NOTE
All Wharfedale Pro loudspeaker measurements are carried out fairly, and in-line with industry standards to ensure
users can select the right product for their application, and understand exactly how it performs. Please see thebelow details on how our speakers are measured and how the information is presented.
• Sensitivity
Calculated from the eﬀective frequency range, as the sound pressure level produced at 1 m on the reference
axis by an applied voltage of 2.83v. Note: it is important to consider Rated Impedance when reviewing sensitivity
measured with 2.83v input. Sensitivity ratings of 1w/m were replaced by the more appropriate 2.83v/m in
AES2-2012. For more information refer to AES standard AES2-2012.
• Calculated Maximum SPL @1m
Max SPL is deﬁned as the peak acoustic output calculated by 10*Log (Peak Power) + Sensitivity. Example: 10* Log(800)+96 = 125dB.
• Power
Power, expressed in units of watts is deﬁned by the equation v2/Z where v=voltage input and Z=Rated Impedance.
Example: 492/8=300 watts. Using band limited pink noise, the voltage average is measured with a true RMS meter.
Band limited signal Crest Factor is typically 12dB, meaning that peaks deliver 4 x the v, or 16 x the power of theaverage input level.
Note: Loudspeaker power rating is a complex topic. WP endeavors to demystify power ratings by explaining
procedures. The AES2-2012 standard for loudspeaker drivers in section 6 describes power handling. Be awarethat the AES power handling ratings are for an accelerated two-hour test designed as a repeatable test to deﬁnea benchmark to compare loudspeaker drivers. The AES2-2012 section 6 deﬁnition is in no way intended to deﬁnelong term operating power levels, nor is it appropriate for systems.
• Continuous PowerThe average dynamic power capacity over the device's recommended bandwidth that may be sustained
continuously. WP test with band limited pink noise applied for a minimum of eight hours.
• Program Power
Program power is a useful rating to guide the choice of ampliﬁer power that may safely be coupled to the system.
Common sense must be considered dependent on the source signal."• Peak PowerThe capacity to withstand short peaks, typically less than 10ms, delivered by dynamic peaks of audio signals, within
the recommended bandwidth."12

WHARFEDALE PRO LIMITED WARRANTY
Wharfedale Pro products are warranted of manufacturing or material defects for a periodof one year from the original date of purchase. In the event of malfunction, contact yourauthorized Wharfedale Pro dealer or distributor for information.
*Be aware that warranty details may diﬀer from country to country. Contact your dealer or
distributor for information. These terms do not infringe your statutory rights.

13

Wharfedale Professional
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www.wharfedalepro.com
Wharfedale Professional reserves the right to alter or improve speciﬁcations without notice.
All rights reserved © 2021 Wharfedale Pro. Wharfedale Pro is a member of the IAG Group.