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Continuous Power Handling
Voice Coil Diameter
Magnet Material
 
 
 
 

Specifications

  • Nominal Diameter530 mm (21.0 in)
  • Nominal Impedance4 Ω
  • Minimum Impedance4.2 Ω
  • Nominal Power Handling11700 W
  • Continuous Power Handling23400 W
  • Sensitivity397.0 dB
  • Frequency Range33 - 1000 Hz
  • Voice Coil Diameter116 mm (4.5 in)
  • Winding MaterialCopper
  • Former MaterialGlass Fibre
  • Winding Depth34 mm (1.34 in)
  • Magnetic Gap Depth14 mm (0.55 in)
  • Flux Density1.15 T

Design

  • Surround ShapeTriple Roll
  • Cone ShapeRadial
  • Magnet MaterialNeodymium Inside Slug
  • SpiderDouble Silicone
  • Pole DesignT-Pole
  • Woofer Cone TreatmentTWP Waterproof Both Sides
  • Recommended Enclosure250.0 dm3 (8.83 ft3)
  • Recommended Tuning32 Hz

Parameters4

  • Resonance Frequency33 Hz
  • Re3.6 Ω
  • Qes0.37
  • Qms7.7
  • Qts0.36
  • Vas278.0 dm3 (9.7 ft3)
  • Sd1680.0 cm2 (260.4 in2)
  • η₀2.6 %
  • Xmax14.0 mm
  • Xvar15.0 mm
  • Mms335 g
  • Bl24.8 Txm
  • Le1.7 mH
  • EBP89 Hz

Mounting And Shipping Info

  • Overall Diameter547 mm (21.5 in)
  • Bolt Circle Diameter527 mm (20.7 in)
  • Baffle Cutout Diameter503.0 mm (19.8 in)
  • Depth249 mm (9.8 in)
  • Flange and Gasket Thickness14 mm (0.53 in)
  • Air Volume Occupied by Driver15.0 dm3 (0.53 ft3)
  • Net Weight14.0 kg (30.8 lb)
  • Shipping Units1
  • Shipping Weight16.3 kg (35.94 lb)
  • Shipping Box570x570x320 mm (22.44x22.44x12.60 in)

Service Kit

  • RCK21SW1154
  • 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.