21" Ferrite Subwoofer Driver 2000w RMS Power Sub Bass Woofer 8 ohm - BWP21


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£299Incl. VAT Our Price
£399Incl. VAT Typically This represents the average price across other brands that offer the same level of functionality and features as this product
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This 21″ Ferrite Sub Speaker with its cast alloy basket is ideal for use in Touring, Reggae Bars and Club Systems.

Highly respected and widely used but a best-kept secret. Now you can buy this driver to put in your boxes.

The price is sensible because our users do not want to pay for fancy marketing they just need an honest driver at an affordable price.

This 21" Sub Speaker is used by professionals globally to deliver sub frequencies. Full technical specifications and downloads are available with more detail provided by email simply contact Andrew

  • 2000w RMS POWER
  • Twin Magnets
  • 140 MM Voice coil
  • 99dB Sensitivity
  • Frequency Range 20Hz to 1KHz

Model No: BWP21 8 OHMS


  • Nominal Diameter: 21 inch
  • Nominal Impedance: 8ohm (4 Ohm available - Special Order)
  • Program Power: 4000w
  • Power Handing: 2000w
  • Frequency Range :20-1.0KHz
  • Effective Diaphragm Diameter :470mm
  • Minimum Impedance :5.4Ohm/3.2ohm
  • Voice-coil Diameter:140mm
  • Voice-coil Winding Depth:30mm
  • Numbers of layers: 42
  • Kind of layer: in/out
  • Top Plate Thickness: 12
  • Magnet Size :280*150*20*2PCS
  • Double Magnet


  • Resonance Frequency FS 36Hz
  • DC resistance Rte 5.4ohm/3.2ohm
  • Mechanical Factor Qms 9
  • BL Factor Qes 0.39
  • Le 2.1mh
  • Re 5.7ohm
  • Total Factor Qts 0.38
  • BL Factor BL 34T-m
  • Effective Moving Mass Mms 353gr
  • Equivalent Cas Air Load 263 -269 litres
  • Effective Piston Area sd 1885cm2
  • Max.Linear Excursion Xmax 13mm
  • Half-Space Efficiency Eff 3.2%


  • Overall Diameter 568mm
  • Boil Circle Diameter 493mm
  • Bolt Hole Diameter 7mm
  • Mount Hole Diameter 552mm
  • Depth 245mm
  • Net Weight 25.2 KGS
  • Shipping Weight: 28.5 KGS
  • Shipping Box: 60*60*30CM

Your Guarantee is for 12 months and starts from delivery date but please read on. The warranty is recorded with the BishopSound Order number which begins with a B. Please download and keep a copy of your invoice and keep it safe.

We know problems can occur from time to time so even after 1 year I am here to help. We carry parts and we treat everyone as we expect to be treated ourselves so we will work hard to get a win win.

We still help people who bought from us at Carlsbro 30 years ago with parts (if they are available) repairs and solutions. BishopSound prides itself on treating every customer as a family friend.

In short if the problem was caused by me its up to me to fix it. If you had an accident then I will try my hardest to fix it at little or no cost to you. This guarantee is in addition to, and does not affect your statutory rights or the other right of consumer purchases.

For more information, please see our Terms & Conditions

    Get in touch with BishopSound today for professional and friendly advice. Alternatively, you can call us on 01765 698 233 or 07973 223949. If you want to send a direct email please use andrew@bishopsound.com or victoria@bishopsound.com.

    If you have a question for Andrew use this form or Live Chat for a fast reply.