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R400b Subwoofer

Quick Overview

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.
  • Features
  • Specifications
  • Videos
  • Awards and Reviews
Features

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.


POWER

PRECISION

Designed from the ground up, the R series is a towering leap forward that creates a new dimension in sonic authenticity.

The geometry and bracing of the enclosure optimises vibrational behavior, reducing secondary radiation from cabinet walls for a cleaner sound. Damping panels further minimize cabinet resonance and colouration.

Front baffles are clean with no visible screws. Grilles are fixed magnetically. Available in real Walnut and Rosewood veneers, or highly polished Piano Black, the R Series complements the home as much as it respects the music.


PRECISION

ACCESSIBLE

The R Series presents the high-end technologies of KEF BLADE in a timeless, elegant format. Serious audiophiles can now enjoy phenomenally accurate reproduction that neither adds nor subtracts from the original recording. Indulge in the R400b experience at a price that will also be music to your ears.

Refined, spacious and exquisitely detailed, you won't just hear music the way it was intended it to be. you'll live it, feel it and love it.

ACCESSIBLE
Specifications

Additional Information

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
Variable low pass filter 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
Videos





Awards and Reviews


Subwoofer highly commended over $2,000
Year: 2012
Magazine / Issuing Body: Sound+Image Awards 2013
Country: Australia
Product: R400b



Home Theater Top Picks
Year: 2012
Magazine / Issuing Body: Home Theater
Country: USA
Product: R400b
Review
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