WHARFEDALE PRO SI-X Series 800 Watts RMS 18" Passive Subwoofer

SI-18BX

Wharfedale Pro

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SI-18BX

800 watts
AES (RMS)

18″ passive subwoofer

4.0″ voice coil 

800 watts AES (RMS)

1600 watts Programme

3200 watts Peak

134 dB Max SPL @ 1 meter

4Ω or 8Ω models

The SI-X™ Series –– Foreground/Background Music And Sound Reinforcement Speakers

The SI-X Series is a versatile fixed installation loudspeaker system designed for surface mount or flown applications. The angled low profile enclosures are designed to provide high SPL in an unobtrusive package.

Consistent voicing across the range ensures seamless coverage when using a variety of different models in distributed sound applications. All SI-X Series models feature a 1” exit compression driver on a 70°x 70° conical waveguide providing open and detailed high frequency extension with even and predictable dispersion.

Because of their multi-faceted design the SI-X speakers can be positioned next to a stage, wall or ceiling. This versatility suits the SI-X Series to a diverse range of applications such as live performance halls, houses of worship, schools, shops, restaurants, bars and public houses.

The SI-X Series includes full range enclosures with woofer sizes ranging from 10” to 15”, a dual 8” woofer model is also available. The full range enclosures are complimented by 3 subwoofers for extended low frequency response and increased SPL. Available in black or white painted finishes all models feature multiple M8 rigging points to suit the widest range of flown applications. Brackets are included as standard.


  • 2-way reflex systems
  • Folded horn and Direct Radiating subwoofers
  • 25.4mm Titanium high frequency compression drivers
  • Low distortion, high power woofers
  • 70° x 70° High Frequency Horn
  • Multifaceted 40° x 50° MDF enclosure
  • 20 x M8 hanging points
  • NL4 & Barrier Strip speaker inputs 
  • U-shaped steel mounting bracket included
  • Install in houses of worship, shops and other public areas
  • Available in Black and White


Model Name SI-18BX
System Type Passive
Configuration Subwoofer
Freq Response (+/-3 dB) 35 Hz – 200 KHz
Freq Range (-10 dB) 30 Hz – 200 KHz
Sensitivity (2.83 v / 1 m) 99 dB
Calculated Max SPL @1 m 134 dB
System Impedance 8 Ω or 4 Ω
LF Transducer  
Size 470 mm / 18″
Voice coil Size  102 mm / 4”
Rated Impedance 8 Ω or 4 Ω
LF Power (re:AES2-2012)  
HF Transducer  
HF Driver Type  
Voice coil Size  
Exit Size  
Diaphragm Material  
Rated Impedance  
HF (re:AES2-2012)  
Nominal Coverage  
Power  
Continuous Power 800 W
Programme Power 1600 W
Peak Power 3200 W
Crossover frequency  
Input Connector 2 x NL4 +
Barrier Strip
Hardware  
Rigging  
Pole Mount No
Enclosure  
Enclosure Material MDF
Finish Black or White
Grille Material & Finish 1.2 mm Steel
Dimensions – Unpacked  
Height 620 mm / 24.42″
Width Front 537 mm / 21.14″
Width Rear 537 mm / 21.14″
Depth 508 mm / 20.0″
Dimensions – Packed  
Height 685 mm / 26.97″
Width Front 600 mm / 23.62″
Width Rear 600 mm / 23.62″
Depth 575 mm / 22.64″
Weight  
Net Weight 35.5 kg / 78.1 lbs
Gross Weight 44 kg / 96.8 lbs