Continuous Power Handling
Voice Coil Diameter
Magnet Material

The new B&C 18RBX100 anchors our ferrite subwoofer line, and features an all new FEA optimized motor structure. The 25mm high, 4” (100mm) diameter copper wire voice coil is combined with a laminated double silicone spider, water resistant curvilinear cone and triple roll surround, for even more excursion and linearity.

The corrosion resistant motor structure incorporates an aluminum demodulation ring that effectively controls inductive rise as well as harmonic and intermodulation distortion. This subwoofer can be used for a wide variety of applications, including compact vented enclosures as small as 120 litres.



  • Nominal Diameter460 mm (18.0 in)
  • Nominal Impedance4 Ω
  • Minimum Impedance4.5 Ω
  • Nominal Power Handling11000 W
  • Continuous Power Handling22000 W
  • Sensitivity397.0 dB
  • Frequency Range35 - 1000 Hz
  • Voice Coil Diameter100 mm (4.0 in)
  • Winding MaterialCopper
  • Former MaterialGlass Fibre
  • Winding Depth25.0 mm (1.0 in)
  • Magnetic Gap Depth11.0 mm (0.43 in)
  • Flux Density1.1 T


  • Surround ShapeTriple Roll
  • Cone ShapeCurvilinear
  • Magnet MaterialFerrite
  • SpiderDouble Silicone
  • Pole DesignT-Pole
  • Woofer Cone TreatmentTWP Waterproof Both Sides
  • Recommended Enclosure140.0 dm3 (4.94 ft3)
  • Recommended Tuning40 Hz


  • Resonance Frequency42 Hz
  • Re3.5 Ω
  • Qes0.41
  • Qms8.0
  • Qts0.4
  • Vas136.0 dm3 (4.8 ft3)
  • Sd1225.0 cm2 (189.88 in2)
  • η₀2.5 %
  • Xmax10.0 mm
  • Xvar13.0 mm
  • Mms210.0 g
  • Bl22.0 Txm
  • Le1.2 mH
  • EBP102 Hz

Mounting And Shipping Info

  • Overall Diameter460 mm (18.11 in)
  • Bolt Circle Diameter440 mm (17.32 in)
  • Baffle Cutout Diameter422.0 mm (16.61 in)
  • Depth200 mm (7.87 in)
  • Flange and Gasket Thickness14 mm (0.55 in)
  • Air Volume Occupied by Driver10.5 dm3 (0.37 ft3)
  • Net Weight12.3 kg (27.12 lb)
  • Shipping Units1
  • Shipping Weight13.9 kg (30.64 lb)
  • Shipping Box500x495x275 mm (19.69x19.49x10.83 in)

Service Kit

  • RCK18RBX1004
  • 2 hours test made with continuous pink noise signal (6 dB crest factor) within the range Fs-10Fs. Power calculated on rated minimum impedance. Loudspeaker in free air.
  • Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
  • Applied RMS Voltage is set to 2V for 4 ohms Nominal Impedance.
  • Thiele-Small parameters are measured after a high level 20 Hz sine wave preconditioning test.