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


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$5,641Excl. VAT

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

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 or

    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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