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Continuous Power Handling
Voice Coil Diameter
Magnet Material
 
 
 
 

Key Features

  • 4000 W continuous program power capacity
  • 153 mm (6 in) split winding copper voice coil
  • 30 - 1000 Hz response
  • 96 dB sensitivity
  • 60 mm peak-to-peak excursion before damage
  • Neodymium magnet allows a very high force factor and linear excursion
  • Double silicone spider with optimized compliance
  • Ventilated voice coil gap for reduced power compression
  • Aluminium demodulating ring for very low distortion

Specifications

  • Nominal Diameter530 mm (21.0 in)
  • Nominal Impedance4 Ω
  • Minimum Impedance4.2 Ω
  • Nominal Power Handling12000 W
  • Continuous Power Handling24000 W
  • Sensitivity396.0 dB
  • Frequency Range30 - 1000 Hz
  • Voice Coil Diameter153 mm (6.0 in)
  • Winding MaterialCopper
  • Former MaterialGlass Fibre
  • Winding Depth30.0 mm (1.18 in)
  • Magnetic Gap Depth12.0 mm (0.5 in)
  • Flux Density1.2 T

Design

  • Surround ShapeTriple Roll
  • Cone ShapeRadial
  • Magnet MaterialNeodymium Inside Slug
  • SpiderDouble Silicone
  • Pole DesignT-Pole
  • Woofer Cone TreatmentTWP Waterproof Both Sides
  • Recommended Enclosure190.0 dm3 (6.71 ft3)
  • Recommended Tuning33 Hz

Parameters4

  • Resonance Frequency32 Hz
  • Re3.3 Ω
  • Qes0.31
  • Qms7.0
  • Qts0.3
  • Vas200.0 dm3 (7.0 ft3)
  • Sd1680.0 cm2 (260.4 in2)
  • η₀2.2 %
  • Xmax15.0 mm
  • Xvar16.0 mm
  • Mms460.0 g
  • Bl32.5 Txm
  • Le1.5 mH
  • EBP103 Hz

Mounting And Shipping Info

  • Overall Diameter547 mm (21.5 in)
  • Bolt Circle Diameter527 mm (20.7 in)
  • Baffle Cutout Diameter508.0 mm (20.0 in)
  • Depth261 mm (10.3 in)
  • Flange and Gasket Thickness16 mm (0.63 in)
  • Air Volume Occupied by Driver16.0 dm3 (0.56 ft3)
  • Net Weight18.5 kg (40.7 lb)
  • Shipping Units1
  • Shipping Weight20.8 kg (45.86 lb)
  • Shipping Box570x570x320 mm (22.44x22.44x12.60 in)

Service Kit

  • RCK21SW1524
  • 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 2.83 V for 8 ohms Nominal Impedance.
  • Thiele-Small parameters are measured after a high level 20 Hz sine wave preconditioning test.