21 inch Dual 4000w RMS Subwoofer

£832.50 Inc VAT

(includes 20% VAT)
30 day money back guarantee

4 in stock



This is my 21 inch Dual Subwoofer made with 18mm Birch Plywood. This passive neodymium sub woofer delivers 4000w RMS and over 139 dB SPL. Each driver in the box is 2000w RMS and a 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.

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  https://bishopsound.com/videos/

Call Andrew on 07973 223949 for more information.

Description

The 21 inch Dual Subwoofer with its matched pair of Neodymium woofers is our most powerful subwoofer as it delivers 4000w RMS and a minimum 139dB SPL.

The robust 21 inch Dual Subwoofer enclosure is constructed from premium multi-laminate Birch plywood and is finished in 3 coatings of Jet Black impact resistant textured polyurea paint. Two NL4 connection panels are provided on the rear for input and linking. Each 21 inch Dual Subwoofer driver has its own connection plate. This gives you the option to link them if your amplifier will tolerate a 2-ohm load but we recommend you drive each cabinet with a 2 channel amplifier capable of delivering over 2000 watts into 4 ohms. The front of the loudspeaker is protected by a rigid steel grille.

You can learn more about Bishopsound by watching my videos on my Youtube channel I am adding more Video every month  https://bishopsound.com/videos/

Model Beta BB221s (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 29~1000 Hz
Impedance 4 OHM for each driver
Power RMS (W) 4000w
Sensitivity (1w/1m)(dB) 101dB
Max SPL (dB) 139dB
Crossover (Hz) 150hz
Connection 4 pole connector
Cabinet size 70*65*122 cm
Cabinet material 18mm plywood
Carton size 73.5*70.5*128 cm
Product Weight 78Kg
Gross Weight 82kg

 

The Driver for our Dual 21-inch passive subwoofer is made by us at Bishopsound and here are the details:

GENERAL CHARACTERISTICS ELECTRICAL CHARACTERISTICS
NOMINAL OVERALL DIAMETER
Nominal Voice Coil Diameter 312 mm Nominal Impedance 4 Ω
Magnet Weight NEO Rated Power 2000 W
Flux Density 1.1 T Sensitivity@1W/1m 96 d B
Weight 15.0 Kg
THIELE-SMALL PARAMETERS
Voice Coil DC Resistance Re 3.6 Ω
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 ηo 2.250 %
Diaphragm Area Sd 1680 Cm2
Losses Electrical Resistance Res Ω
Voice Coil Inductance@ 1K Hz LE m H Hz LE m H
CONSTRUCTIVE CHARACTERISTICS
Magnet NEO
Voice Coil Winding Copper
Voice Coil Former Glass Fibre Glass Fibre
Cone Paper
Surround Treated Cloth
Dust Dome Paper
Basket Aluminum

 

I am very proud of my 21-inch Dual subwoofer.

Bishopsound Speakers and associated products are competitively priced, high-quality and are focused on delivering a superb British tone.

Every customer order is managed and handled by me as I must ensure a fast and efficient service. I aim to treat customers as I expect to be treated myself and always give of my best.

Bishopsound design and manufacture in the United Kingdom, China, and India. My goal is to provide my customers with high quality, sensibly priced Professional Audio.

Andrew made his first speaker in 1972 and has many years of experience creating and delivering speakers systems. Backed up by my standard 30 Day Money Back Guarantee.

Additional information

Weight 82 kg
Dimensions 128 x 73.5 x 70.5 cm

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