At just 14 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.
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.
The new bass driver is equally impressive. The combination of a massive vented magnet assembly and a large, lightweight aluminium voice coil driving a light, stiff and strong hybrid cone assures clean, deep and uncompressed bass output with superb dynamics and power handling., fast and clean midrange response. And as the speaker footprint is the same, no more space is required.
Inside the cabinets (in a choice of classic Piano Black and real wood veneer finishes in Rosewood or Walnut) every single component confirms KEF’s technology leadership. Computer-designed crossovers allow the level of each driver to be fine-tuned for a smoother, flatter response. Constrained layer damping panels prevent cabinet vibration from muddying the mid-range and bass – even the airflow through the reflex ports is managed using computational fluid dynamics to optimise acoustic integrity.
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 a near-Reference 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.
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.)