Wharfedale SIGMA-X18B-BK High-Performance 18-Inch Passive Subwoofer - Black

The Wharfedale SIGMA-X18B is a high-performance 18-inch passive subwoofer designed to deliver deep, powerful bass in professional audio systems. Built with a rugged, durable cabinet and high-quality components, the SIGMA-X18B is engineered to provide reliable, consistent performance even in demanding environments. Its large 18-inch driver produces exceptional low-frequency output, adding depth and impact to live sound systems, installations, or mobile setups. The SIGMA-X18B is the perfect complement to full-range speakers, enhancing bass response and delivering a balanced audio experience. Whether used in large venues or outdoor events, the SIGMA-X18B offers the power and performance needed to support high-quality sound reproduction.

Columns with Mini Evo-Fold

SIGMA-XV models feature the highly refined mini-EVO-Fold waveguide along with HF compression drivers. For the SIGMA-XV5 there is one, while the SIGMA-XV9 features two compression drivers, each with a mini-EVO-Fold waveguide. This mini-EVO-Fold design provides consistent dispersion coverage on both the horizontal and vertical planes with the sound radiating from one, singular and coherent, source.

Easy Install

Installations can be complicated enough, so we have made SIGMA-X series as easy as possible.

For the SIGMA-XV Column array, either use the included U bracket, or for even more adjustment, use the optional WPB-SV which gives up to 15° tilt and 180° of rotation. SIGMA-X full range cabinet models all have 17 x M8 rigging points, PLUS 35 mm pole sockets. Fly or wall bracket! SIGMA-X8, X10, X12 and X15 can use the optional WPB-1 or WPB-2 wall brackets.

Easy Connection

All SIGMA-X models (with the exception of the 70 V / 100 V T models) are equipped with both SpeakON compatible and barrier strip inputs.  It is another small step that makes the installation easy.

Rotatable Waveguides

SIGMA-X8, SIGMA-X10, SIGMA-X12 AND SIGMA-X15 feature a rotatable waveguide.

90° x 60° or 60° x 90°…. you decide.

Product Specifications:

System Type: Passive

Configuration: Subwoofer

Frequency Response:

Frequency Response (+/-3 dB): 35 Hz – 250 Hz

Frequency Range (-10 dB): 30 Hz – 250 Hz

Sensitivity and SPL:

Sensitivity (2.83 V / 1 m): 100 dB

Calculated Maximum SPL @1 m: 133 dB

System Rated Impedance:

Impedance: 4 Ω

Low-Frequency Transducer:

Size: 457 mm / 18″

Voice Coil Size: 64 mm / 2.5″

Rated Impedance: 4 Ω

LF Power re: AES2-2012: 500 W

High-Frequency Transducer:

Driver Type: N/A

Coil Size: N/A

Exit Size: N/A

Diaphragm Material: N/A

Rated Impedance: N/A

HF Power re: AES2-2012: N/A

Waveguide and Coverage:

Waveguide Type: N/A

Nominal Coverage (H x V): N/A

Drivers:

LF Driver: 1 x 18″

HF Driver: N/A

Power:

System Continuous Power: 500 W

System Programme Power: 1000 W

System Peak Power: 2000 W

Crossover Frequency: 150 Hz

Recommended HPF = BW 18 dB/oct.: 28 Hz

Input Connector:

Type: 2 x SpeakON / 1 x Barrier Strip

Hardware

Pole Socket: 35 mm pole socket

Rigging Points: M8 x 17

Handles: 4 handles on sides

Enclosure:

Material: 18 mm MDF

Finish: Black Paint

Grille Material & Finish: 1.2 mm steel, painted

Weight: 39.1 kg / 86 lbs.

Dimensions (L x W x H): 31" x 20" x 21"

Shipping Weight: 46.4 kg / 102 lbs.

Shipping Dimensions (L x W x H): 34" x 23" x 26"