|Warranty length||1 Year|
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 built-in Class-D
Low pass filter: 40 - 140Hz, 4th-order
Low level inputs: RCA phono sockets
Internal volume: 22 litres
Power requirements: 100V-120V - 50/60Hz
Power consumption: 600VA
Dimensions (HWD): 365 x 330 x 351mm
Weight: 21.5kg (47.4lbs.)
The KEF R400b subwoofer (available on 0% finance when you spend over £1000) may be compact, at just 31 inches square but 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. Match with the KEF R series for a perfect home cinema experience, see the benefits of the new R series below!
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 Uni-Q MF/HF driver array is a masterpiece. Midrange response is amazingly fast and clean, thanks to a braced magnesium/aluminium alloy cone, with KEF’s Z-flex surround smoothing the transition to the front panel and a sturdy die-cast aluminium chassis that prevents resonance being transferred to the cabinet.
At the acoustic centre of the midrange cone is the sophisticated vented tweeter that endows KEF Blade with such startlingly pure HF response. With a large neodymium magnet and a computer-optimised dome structure so stiff that it operates pistonically over its entire working range, the upper registers are articulated with flawless precision – and to capitalise on Uni-Q’s point source characteristics,
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.
Inside the cabinets 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.
The all-new R Series represents a decisive step forward in the enjoyment of music or film. By incorporating the high end technologies of previous KEF masterpieces in a classically elegant format, it gives serious audiophiles phenomenally accurate reproduction that neither adds to nor subtracts from the original recording: refined, spacious and exquisitely detailed. For those whose appreciation of true audio excellence outstrips their bank balance, look no further than new R series!