Big Gig Rig 8 - Passive 10800w RMS Twin 15" Tops and Twin 21" Subwoofer PA System


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Earn 14995 Sound Points!

This 10,800w RMS Point Source Plywood System comprises of:

4 x Delta Birch 18mm Plywood Dual 15" Passive 2-way 1200w RMS 4 ohm Touring Speakers

2 x Delta Birch 18mm Plywood Dual 21" Subwoofers 3000w RMS 2 x 4-ohm Touring Subs

Key Features:

  • Sound for 7000+ Audience
  • Punchy Thumping Bassline from the 21" super subs!
  • 100% Long Lasting 18mm and 15mm 13 ply Marine Birch Plywood
  • 4 Coats of thick Jet Black PU paint
  • Gorilla Glued Screwed and bolted
  • BishopSound Cast Alloy purpose-designed drivers
  • Heavy-Duty Recessed 16 gauge powder-coated grille with acoustic foam behind to prevent water ingression
  • Point source - 120-degree x 60-degree Dispersion
  • British Engineering -  British Design - UK Stock
  • British Made Waterproof Covers Available

BD215 - Summary

Built to take the rigours of touring the 18mm (13 plies) birch marine plywood, the Delta BD215 speaker is a twin 15″ upright full range speaker made from 100% Birch Marine Plywood boasting an incredible 1200w RMS power that's 2400 continuous/program or 4800w Peak!, these speakers will easily cater to audiences in excess of 5000 people.

The thick recessed grill gives added protection. Punching out Twice the power of other leading brands from overseas.

This cabinet includes 2 x 600w RMS BishopSound BDP15FR cast Alloy woofers and 1 x 100w BRC175 Titanium Compression Driver. So the drivers in this cabinet are 1300w rated. I guess you ask why we don't rate this cabinet at 1300w RMS? I guess we like some headroom which is why our failure and returns rate is less than 1%!

We have recessed the grilles and doubled its thickness, added 4 coats of high impact, textured jet black PU paint to withstand the inevitable bumps and knocks whilst on tour.

BD221 - Summary

My 21-inch Dual Subwoofer made with 18mm Marine Birch Plywood. This pair of passive neodymium subwoofers deliver 3000w RMS and over 139 dB SPL. Each driver in the cabinet is compartmentalized and delivers 1500w RMS, 4-ohm impedance.

The Twin 21" is housed in a sturdy cabinet and finished in a durable hard-wearing protective waterproof coating. The coating has a primary use for automotive linings, industrial and military coating markets due to the superior finish and the very high abrasion resistance. This box is perfect for touring or fixed installations.plywood ported box for sub-bass very little comes near for sound quality and power.

Those who know the capability of these speakers and are entertaining the masses need little more detail. But here is a quick glance.

The Subwoofers will be new to you as few are brave enough to harness the power of Neo drivers that deliver 1500w RMS each. 


  • Passive dual 15'', two-way, bass-reflex speaker
  • 139dB peak
  • Frequency Range 47Hz - 19kHz
  • 1200w RMS
  • BDP15FR Drivers
  • BRC175 HF
  • Steel Handles
  • Trapezoidal, 18mm, 13-ply birch marine plywood wooden enclosure
  • Coverage 120° x 60° nominal
  • Countersunk Extra Tick "ding proof" grille to prevent grill damage when on tour
  • Acoustic foam behind the grille to prevent moisture and dust ingression
  • Dimensions = 51 x 52 x 118 cm
  • Weight = 37kg


  • Model Beta BD221s (Textured Black Polyurea Paint)
  • Finish A durable hard wearing protective waterproof coating. Its primary uses are automotive linings, industrial and military coating markets due to the superior finish and the very high abrasion resistance
  • System Type 21" (Subwoofer) x 2
  • Frequency Range 29~200 Hz
  • Impedance 4 OHM for each driver
  • Power RMS (W) 1500w
  • Power PROG (W) 3000w
  • Power Peak (W) 6000w
  • Sensitivity (1w/1m)(dB) 101dB
  • Max SPL (dB) 139dB
  • Crossover (Hz) 150hz
  • Connection 4 pole connector x 4
  • Cabinet size 70*65*122 cm
  • Cabinet material 18mm plywood
  • Product Weight 78Kg
  • The Driver for our Dual 21-inch passive subwoofer is a NEO BWN21 made by us at Bishopsound and here are the details:
  • Nominal Voice Coil Diameter 312 mm Nominal Impedance 4 ½
  • Magnet Weight NEO Rated Power 1500 W
  • Flux Density 1.1 T Sensitivity@1W/1m 96 d B
  • Weight 12Kg
  • Voice Coil DC Resistance Re 3.6 ½
  • Resonance Frequency Fs 35.0 Hz
  • Mechanical Q Factor Qms 10.5
  • Electrical Q Factor Qes 0.45
  • Total Q Factor Qts 0.43
  • 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 ëáo 2.250 %
  • Diaphragm Area Sd 1680 Cm2
  • Losses Electrical Resistance Res ½
  • Voice Coil Inductance@ 1K Hz LE m H Hz LE m H
  • Magnet NEO
  • Voice Coil Winding Copper
  • Voice Coil Former Glass Fibre Glass Fibre
  • Cone Paper
  • Surround Treated Cloth
  • Dust Dome Paper
  • Basket Aluminum

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 or

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    This Big Gig Rig Contains...