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KEF R400b Subwoofer

£1,000.00
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Product Description

R400b Subwoofer

At just 14 inches cubed, the KEF R400b may be compact, yet it packs an incredible punch. With a reinforced and braced sealed cabinet, the R400b houses twin 9-inch LF drivers powered by twin 250W class-D amplifiers. The drivers are mounted back-to-back to create a ‘force cancelling’ effect. This means the opposing reactive forces are nullified, resulting in no cabinet agitation and a clean, fast, powerful bass performance - perfect for any serious home theatre system.

POWER
Dynamic, uncompressed and undistorted bass of heart pounding clarity envelops you, striking deep emotional chords. Your soul will awaken and the earth will move.

BASS DRIVER
Massive, vented magnet assemblies and large aluminum voice coils drive the lightweight yet stiff, strong hybrid cones. Bass output is faster, cleaner and more accurate. Satin anodised elements contribute to the unit’s elegance, while the diameter of the trim ring accentuates a visual sophistication that belies the speaker’s awesome power.

SUBWOOFER
Force cancelling drivers avoid cabinet agitation. Opposing reactive forces are nullified by rigidly mounting the low frequency drivers back-to-back.

 

DESIGN Powered Subwoofer (Sealed)
DRIVE UNITS Bass units: 
LF: 2 x 225mm (9in.)
FREQUENCY RANGE 26Hz - 140Hz (-6dB)
MAXIMUM OUTPUT 111dB
RECOMMENDED AMPLIFIER POWER 2 x 250W (500W) built-in Class-D
LOW PASS FILTER VARIABLE 40Hz - 140Hz, 4th-order
LOW LEVEL SIGNAL INPUTS RCA phono sockets
Speaker level inputs
INTERNAL VOLUME 22 litres
POWER REQUIREMENTS 100V - 120V / 220V - 240V
~ 50 / 60Hz
POWER CONSUMPTION 600VA
DIMENSIONS 365 x 330 x 351 mm (14.4 x 13 x 13.8 in.) with terminal & plinth
WEIGHT 21.5kg (47.4lbs)
UNIT MEASUREMENT Piece
DOCUMENT DOWNLOAD R Series Brochure
R Series Manual
R400b Manual

Product Videos

KEF Ci Series - Extreme Home Theatre - In-wall and In-ceiling Speakers 03:34

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Warranty Information

All KEF Products are precision engineered and the Authorised Distributors provide warranty against FAULTY MATERIAL AND/OR WORKMANSHIP for the following products from the date of original purchase is as follows:- (Warranty may vary according to the local legal requirements of the country concerned.)

Passive loudspeakers: FIVE years
Active loudspeakers, powered subwoofers and motorised speakers: ONE year, or TWO years if purchased in the European Union
Electronics and headphones: ONE year, or TWO years if purchased in the European Union

This warranty will not be extended or renewed at the expiry of the above period.

WARRANTY COVERAGE AND LIMITATIONS

This warranty is only valid in the country of purchase and only applies to the first purchaser of the KEF product(s) from an Authorised Dealer. This warranty does not extend to any other person or transferee, and terminates if you sell or otherwise transfer the KEF product(s) to another party/entity.

This warranty does not cover any of the following:-

normal or fair wear and tear and/or any wear from environmental deterioration of the KEF product and/or its components
mechanical damage or derangement of the KEF product in transit that is not attributable to the fault of the KEF and its Authorised Distributor
deterioration of any consumable components of the KEF product which would become worn or depleted through use (e.g. batteries)
any KEF product whose serial number label(s) is/are missing, made illegible, defaced, altered, removed, or damaged
any KEF product and/or any of its components that is not purchased from an Authorised Dealer/Distributor, including any parallel imports or grey market products
incorrect or unauthorised components which have been substituted and/or used for the KEF Product;
any KEF Product and/or any of its components which have been installed, disassembled, repaired, converted, modified, tampered with or otherwise interfered with in any way by any person/entity other than an authorised representative of the KEF and its Authorised Distributors
any defects, malfunction, loss and/or damages caused by or resulting from any of the following:-
any of the circumstances set out in (1) - (7) above
any accident or negligence not caused by the fault of KEF and its Authorised Distributors
any improper installation or connection of the KEF product (including without limitation any improper connection of the KEF product to improper voltage or power source) not caused by the fault of any of the KEF and its Authorised Distributors
any improper care, dropping, mishandling, misuse, abuse or unreasonable or improper use, operation or maintenance of the KEF Product
any operation of the KEF product with any faulty, unsuitable or inappropriate apparatus and/or ancillary equipment
any use of the KEF Product under abnormal or inappropriate voltage or power surges;
failure to use, operate or maintain the KEF product in accordance with the instructions set out in the users' manual
exposure of the KEF product to extreme temperature, heat, water or other liquids, insects, excessive moisture, sand, chemicals, battery leakage or any other contaminants
any force majeure events, including but not limited to any acts of God, fire, lightning, typhoon, storm, earthquake, hurricane, natural disaster, tsunami, flood, war, riot, public disturbance
any other causes beyond the reasonable control of either KEF and its Authorised Distributor.

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