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


This product is for pre-order, so there will be a longer lead time on deliveries. This product is expected to be available for dispatch from: Dec 31, 2021.

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$340Excl. VAT

Please pre-order. Delivery times vary between 1 month and 3 months dependent on seasonal operational activity. For more details call the sales office on +441765698233 or email andrew@bishopsound.com

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.

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

BishopSound Limited Lifetime Guarantee

Effective on all purchases from 1st January 2021

With a returns rate of less than 1% we are proud to offer the BishopSound Lifetime Guarantee at no extra cost to you

BishopSound Limited will undertake to guarantee the product will be free from defective workmanship and materials for the reasonable life of the product.

What is covered in the guarantee?

BishopSound Limited will at its discretion and expense either repair the defect using new or refurbished parts, or replace the Product with a new or re-manufactured Product of a reasonable equivalent. In all instances BishopSound Limited’s liability will not exceed the original Purchase Price.

What is not covered with the guarantee?

If we find a genuine fault or defect in your item that shouldn’t be there based on normal use, then we’ll repair or replace it for free– no questions asked. But, if that speaker has been unloved or beaten to within an inch of its life, then it might be time to buy a new one! In any case, we’ll review each case and will let you know if we can fix or replace it.

The warranty stated above is the sole and exclusive remedy and BishopSound Limited’s performance shall constitute full and final satisfaction of all obligations, liabilities and claims with respect to the Product. In any event, BishopSound Limited shall not be liable for and consequential, incidental, economic, property, bodily injury or personal injury damage arising from the product, any breach of the warranty or otherwise.

This Warranty applies to the first end-user purchaser, and only when purchased from BishopSound Direct or an authorized BishopSound Limited Dealer/Distributor on the UK Mainland listed on our website.

Additional Limitations and Exclusions from Warranty Coverage: The warranty described above is non-transferable, applies only to the Product purchased, does not include installation of any repaired or replaced Product, does not include damage to any allied or associated equipment which may result for any reason from use with this Product, and does not include labour or parts caused by accident, disaster, negligence, improper installation, broken warranty seals, misuse (e.g. over driving the amplifier or speaker, unstable, unprotected or badly earthed power sources, excessive heat or cold or humidity or inadequate ventilation), or from service or repair which has not been authorized by BishopSound Limited.

The end-user purchaser is liable for the cost of transportation and return of the Product in the original packaging. Any damages incurred during transport are the cost and responsibility of the end-user purchaser.

When purchasing BishopSound Limited products, please keep your receipt of purchase safe and retain all the original packaging, as this validates your warranty.

How To Claim

To qualify for the Lifetime warranty, in the first instance you must contact BishopSound Limited showing proof of purchase and the product code. You must be in possession of the original packing as this has the Serial Number printed on it. You will be asked for the serial number and given a return authorization number (RAN), which is required to progress with your warranty claim.

Any decision made by BishopSound Limited regarding any Lifetime Warranty claim is full and final.

How long is the product covered for?

To help give you an idea of our expected product lifetimes we’ve built a guidance table.

If no proof of purchase available product lifetime will be measured on date of manufacture.

Active Speakers - 5 years

Passive Speakers - 6 years

Power Amplifiers - 6 years

This warranty takes effect from the 1st January 2021 onward. Goods purchased prior to this date were sold with the 12 month warranty which still stands.

Only branded BishopSound Limited Products are included in the Lifetime Guarantee:

For more information, please see our Terms & Conditions

    Get in touch with BishopSound today for professional and friendly advice. 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.

    Our PA helpline is open between 10am and 6pm Monday to Friday on +44(0)1765 698233

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