21" Neodymium Subwoofer Speaker 1200w RMS Sub Bass Woofer 4 Ohm


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£199Incl. VAT Our Price
£349Incl. 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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Prototypes V1 working perfectly this is a 116mm Voice Coil - 12kg - Neo 21" Driver.

Only 2 left

This 21″ Sub Speaker is ideal for use in Touring, Reggae Bars and Club Systems.

These are the ultimate delivery vehicle for 27 Hz and earth-shaking sub-bass.

Bishopsound drivers are high-quality PA speakers using strong chassis. Made from professional grade materials and tested fully before shipping. Please note basket style may vary. British PAper Cones ensure perfect performance.

I list this 21" at 1200w to protect it from misuse. Professional users using the right cabinet cooling and control circuitry will get greater performance.

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

This is a superb BishopSound 21″ 1200w RMS Neodymium speaker for professional use.


  • Overall diameter 548 mm
  • Net weight 12 kg
  • Shipping weight 14 kg
  • Shipping box 590x590x300 mm
  • Magnet NEO
  • Flux Density 1.1 T


  • Nominal Impedance 4 Ω
  • Musical Power 24000 W
  • RMS Rated Power 1200 W
  • Sensitivity@1W/1m 96 dB


  • Voice Coil DC Resistance Re 3.6 Ω
  • Resonance Frequency Fs 35.0 Hz
  • Voice Coil 116mm
  • Mechanical Q Factor Qms 10.5
  • Electrical Q Factor Qes 0.45
  • Total Q Factor Qts 0.43
  • Xmax 14.0 mm
  • Sd 1680.0 cm2 (260.4 in2)
  • Xmax 14.0 mm
  • Xvar 15.0 mm
  • Mms 335 g
  • Mechanical Moving Mass Mms 335 g
  • Mechanical Compliance Cms 252 um/N
  • Force Factor BL 24.3 Wb/m
  • Equivalent Acoustic Volume Vas 260.0 It.
  • Maximum Linear Displacement Xmax ±14 mm
  • Reference Efficiency ηo 2.250 %
  • Diaphragm Area Sd 1680 Cm2
  • Losses Electrical Resistance Res Ω
  • Voice Coil Inductance@ 1K Hz LE m H


  • Magnet NEO
  • Voice Coil Winding Copper
  • Voice Coil Former Glass Fibre
  • Cone British Paper
  • Surround Treated Cloth
  • Dust Cap Paper
  • Basket Aluminium
  • Depth 252 mm
  • Bolt circle diameter 525 mm
  • Baffle cut out diameter 505 mm
  • Flange and gasket thickness 15 mm

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 use this form or Live Chat and if you're interested in becoming an official distributor of BishopSound products, please get in touch below.