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. 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 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.)
