KEF R400B Active Subwoofer - White
KEF R400B Active Subwoofer - White
Warranty Period:2 yearsSold as:Single Unit
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At just 31 inches square, 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 ‘force cancelling’. 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.



DesignPowered Subwoofer (Sealed)
Drive UnitsBass units:
LF: 2 x 225mm (9in.)
Frequency range (-6dB)26Hz - 140Hz
Maximum output111dB
Amplifier2 x 250W (500W)
built-in Class-D
Low pass filter Variable40Hz - 140Hz, 4th-order
Low level signal inputsRCA phono sockets
Internal volume22 litres
Power requirements100V - 120V / 220V - 240V

~ 50 / 60Hz
Power consumption600VA
Weight21.5kg (47.4lbs.)
Dimension (H x W x D)
(with grille, terminal & plinth)
365 x 330 x 351 mm
(14.4 x 13 x 13.8 in.)