Key Features


  • 18″ LF driver
  • 4″ voice coil
  • 134dB Max SPL
  • Birch plywood construction
  • Premium Rhino Rock paint
  • 8Ω impedance
  • 800w continuous
  • 1600w programme
  • 3200w peak
  • 2 carry handles
  • Bi-amp and Passive modes
New crossover design
Internally Delta X models have a new crossover design and construction.Using new component positioning and bracing, the sensitive crossover electronics have been re-engineered to improve long term performance and reliability – even at the highest of volumes.
15mm Russian Plywood Construction
Delta X18B is made of premium 15mm Russian birch plywood.It is even more dense than MDF and creates an extremely strong and durable cabinet. Although not recommended, birch plywood is more tolerant in damp conditions.During construction, it is harder to cut but holds screws better than particle board or MDF. This makes it ideal for flagship professional audio loudspeakers which are to be used in extreme and critical environments.
Solid as a rock
As with all Wharfedale Pro PA systems, years of expertise is behind a loudspeaker built to last, with thanks to our high standards of quality control.The Delta X series are coated in the highest quality Rhino Rock paint finish – a chip resistant texture with a professional, discrete aesthetic whilst being prepared for the rigours of life on the road.
Bi-amp and Passive modes
In BI-AMP mode, two power amplifiers can be used. This gives you the advantage of being able to select the best power amplifier specifications for each driver inside the loudspeaker. In a BI-AMP configuration, an external crossover is used to separate the frequencies and this splits the signal to the dedicated LF amplifier and the HF amplifier. This way, each amplifier is only working on the given frequency range and, in turn, is powering the corresponding driver inside the loudspeaker.In PASSIVE mode, a single amplifier can be used to power all drivers inside the loudspeaker. The full frequency range is put into the loudspeaker and the loudspeakers’ internal crossover separates the frequencies, delivering the right frequencies to the right driver. In the example of a 2-way passive loudspeaker, this means that the single amplifier is powering both the HF compression driver and the LF transducer. The internal crossover takes care of both the frequency and power separation.


Model Name DELTA-X18B
System Type Passive
Configuration Subwoofer
Frequency Response (+/-3dB) 38-1.5kHZ(BI-AMP)
Frequency Range (- 10 dB) 30-1.5KHZ
Sensitivity (2.83v/1m) 99dB
Calculated Maximum SPL @1m 134dB
System Rated Impedance
Low Frequency Transducer
Size 470mm / 18″
Voice-Coil Size 102mm / 4″
Rated Impedance
LF Power (re:AES2-2012) 800W
System Continuous Power 800W
System Programme Power 1600W
System Peak Power 3200W
Input Connector 2 x NL4 (speakON Compatible)
Pole Mount 35mm
Handles 2 on Sides
Enclosure Material 15mm Plywood
Finish black paint
Grille Material & Finish 1.5 mm Steel Black
Dimensions – Unpacked
Height 539mm / 21.2″
Width Front 539mm / 21.2″
Width Rear 539mm / 21.2″
Depth 650mm / 25.6″
Dimensions – Packed
Height 624mm / 24.6″
Width Front 611mm / 24.1″
Width Rear 611mm / 24.1″
Depth 722mm / 28.4″
Net Weight (kg / lbs) 37.3kg / 82.06lbs
Gross Weight (kg / lbs) 43.2kg / 95.04lbs


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