KEF R400b Piano Black Subwoofer 250 Watt

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KEF R400b high performance subwoofer is compact, yet packs an incredible punch. Only a serious subwoofer could keep up with KEF's R-Series, and the R400b makes an awe-inspiring addition to any listening room or home theater set-up.

Model R400b
Design Powered Subwoofer (Sealed)
Drive Units Bass units:
LF: 2 x 225mm (9in.)
Frequency range (-6dB) 26Hz - 140Hz
Maximum output 111dB
Amplifier 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
Weight 21.5kg (47.4lbs.)
Dimension (H x W x D)
(with terminal & plinth) 365 x 330 x 351 mm
(14.4 x 13 x 13.8 in.)

The R400b's reinforced and solidly braced cabinet houses twin 9in. LF drivers powered by twin 250W Class-D amplifiers. The drivers are mounted back-to-back: This ‘force cancelling' arrangement nullifies opposing reactive forces. The result is virtually no cabinet agitation and therefore a clean, fast, powerful bass performance.

Legendary KEF R Series
Featuring many of KEF’s latest innovations in premium hi-fi and home theatre loudspeaker technology, the all-new R Series makes genuine audiophile standards of entertainment more affordable than ever before. Stunningly fluent new Uni-Q driver arrays combine with potent new bass drivers and many ingenious refinements to create a rich, spacious sound image of such accuracy that it approaches the benchmark standards of KEF’s legendary Reference Series.