With its discreet and unobtrusive design SIGMA-15 features the latest proprietary Wharfedale Pro driver technology. In addition, SIGMA-15 uses a newly developed angled corner port system so that the dimensions have been reduced without compromising the overall sound quality. Available in black or white and with comprehensive rigging options SIGMA-15 and the new SIGMA SERIES is already a versatile and favourite choice for installers.



Key Features

  • 350W RMS / 700W Program / 1400W Peak
  • 129dB Max SPL
  • 50Hz – 20kHz frequency response
  • Discreet and unobtrusive design
  • Newly developed angled corner port system to reduce dimensions
  • Multiple M8 rigging points and a 35mm speaker pole mount for easy installation
  • Crossovers tailored for vocal intelligibility
  • Chip resistant Rhino Rock paint
  • High performance HF driver with aluminium rear cover for maximum heat dissipation
  • Double roll surround LF driver for stability and power
  • 2.5” voice coil
  • 5 models available in black or white in the range for maximum flexibility

SIGMA 8 uses the latest in Wharfedale Pro driver technology: For the LF drivers, engineers have incorporated a curvilinear, double-roll surround for smooth mid-high transitions and stability for low through to mid range frequencies. With improved thermal dissipation, users can expect consistent delivery at the highest of volumes throughout a performance. The 1 inch polymer diaphragm HF driver is equally robust in design – using a solid aluminum rear plate, the HF driver is strengthened for durability and heat is dissipated efficiently for demanding environments. Wharfedale Pro engineers have selected a 90° x 60° elipitical waveguide optimised for wide coverage for fixed installation purposes.

Wharfedale Pro engineers have matched the acoustic properties of the cabinet to the proprietary driver technology within, while taking physical aspects into consideration to ensure optimal positioning and size for installation. By using a newly-developed angled-corner port system, cabinet height and overall size has been reduced – ideal for unobtrusive mounting within your venue. Additionally the angle-corner port system is fine-tuned acoustically to ensure low- end punch – just as you would expect with a larger PA speaker. The cabinet of the SIGMA 8 loudspeaker also features a pole mount socket ensuring the long-throw HF driver projects the sound directly to your audience. There are also 5 x M8 rigging points for safe and secure flying where needed. SIGMA 8 is also coated in the latest generation chip-resistant, Rhino Rock paint.

The crossovers ensure perfect integration between the drive units and acoustic properties of the cabinet. Electronic components are carefully selected, while over-complex networks have been avoided to maintain a pure and strong audio signal. Engineers have fine-tuned the crossover points for vocal intelligibility and tuned the high frequencies for long-throw to ensure clear coverage right to the back of your venue.


Model Name SIGMA-15
System Type Passive
Configuration Two-way
Frequency Response (+/-3dB) 45Hz-18kHz
Frequency Range (-10 dB) 50Hz-20kHz
Sensitivity (2.83v/1m) 98dB
Calculated Maximum SPL @1m 129dB
System Rated Impedance
Low Frequency Transducer
Size 381mm / 15”
Voice-Coil Size 64mm / 2.5”
Rated Impedance
LF Power (re:AES2-2012) 350W
High Frequency Transducer
HF Driver Type Compression Driver
Voice-Coil Size 44mm / 1.75”
Exit Size 1″
Diaphragm Material Titanium
Rated Impedance
HF Power (re:AES2-2012) 40W
Nominal Coverage (H x V) 90° x 60°
System Continuous Power 350W
System Programme Power 700W
System Peak Power 1400W
Crossover frequency 2kHz
Input Connector 2 x NL4 (speakON compatible)
Hardware Dual-angle (0° or 10°) 35mm pole socket
M8 x 5
2 handles on sides
Enclosure Material 15mm MDF
Finish Black or white
Grille Material & Finish 1.2mm steel, painted
Dimensions – Unpacked
Height 635mm / 25″
Width Front 435mm / 17″
Width Rear 261mm / 11.7″
Depth 439mm / 17.25″
Dimensions – Packed
Height 720mm / 28.35″
Width Front 553mm / 21.75″
Width Rear 303mm / 12″
Depth 488mm / 19.2″
Net Weight 23.4kg / 51.5lbs
Gross Weight 26.7kg / 58.7lbs