Delta Dual 21″ Passive PA Speaker 18MM Marine Birch Plywood 3000W RMS For Touring

BD221

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This is my 21-inch Dual Subwoofer made with 18mm Birch Plywood. This passive neodymium subwoofer delivers 3000w RMS and over 139 dB SPL. Each driver in the box is 1500w RMS and 4-ohm impedance.

Use these to deliver the Sub Bass frequencies that an 18" cannot deliver. Use these at low volume under the 18" subwoofer to truly experience low frequencies.

Key Features:

  • 18mm, 13-ply birch marine plywood wooden enclosure
  • Countersunk Extra Tick "ding proof" grille to prevent grill damage when on tour
  • Acoustic foam behind the grille to prevent moisture and dust ingression
  • Point Source
  • Frequency Range = 29~1000Hz
  • Impedance = 4 ohms per driver
  • Power = 3000w RMS - Program 6000w - Peak 12,000w
  • Max SPL (dB) - 139
  • Cross Over (Hz) - 150
  • Connection - 2 x Speakon in/out on each driver

To get even lower sub low bass plug the ports and seal the cabinet.

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.

This is a superb subwoofer and very little comes near for sound quality and power.

Many believe a 21" driver is only good for near field applications. Our Bishopsound 21" delivers far more.

We are happy for you to test our 21" subwoofer at any weekday by appointment please email andrew@bishopsound.com for more information.

You can learn more about Bishopsound by watching my videos on my Youtube channel I am adding more Video every month. Simply go to Youtube and type BishopSound.

Important information about subwoofers

Subwoofers are designed to reproduce low bass audio signals between 30Hz and 150Hz. Driving them with full frequencies will cause permanent damage, so they should only be operated with a passive low-pass filter, a crossover network, or an active electronic crossover or speaker management system.

  • Frequency Range = 29~1000Hz
  • Impedance (OHM) = 4 ohms per driver
  • Power = 3000w RMS - Program 6000w - Peak 12,000w
  • Max SPL (dB) - 139
  • Cross Over (Hz) - 150
  • Connection - 2 x Speakon in/out on each driver
  • Weight = 78kg
  • Dimensions = 70cm x 122cm x 65cm

THIS IS A SUPERB BISHOPSOUND 21″ 1500W RMS NEODYMIUM SPEAKER FOR PROFESSIONAL USE.

GENERAL CHARACTERISTICS

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

ELECTRICAL CHARACTERISTICS

  • Nominal Impedance 4 Ω
  • Musical Power 3000 W
  • RMS Rated Power 1500 W
  • Sensitivity@1W/1m 96 dB

THIELE-SMALL PARAMETERS

  • Voice Coil DC Resistance Re 3.6 Ω
  • Resonance Frequency Fs 35.0 Hz
  • Voice Coil 125mm
  • 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 ηo 2.250 %
  • Diaphragm Area Sd 1680 Cm2
  • Losses Electrical Resistance Res Ω
  • Voice Coil Inductance@ 1K Hz LE m H

CONSTRUCTIVE CHARACTERISTICS

  • 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

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.

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.

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.

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. 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.