KEF R400b Active Subwoofer 250W


£1000.00 inc vat
£833.33 ex vat
£1000.00 inc vat
£833.33 ex vat
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KEF R400b Active Subwoofer 250W

At just 14 inches cubed, 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 a ‘force cancelling’ effect. 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.


  • Design - Powered Subwoofer (Sealed)
  • Drive Units - Bass units: LF: 2 x 225mm (9in.)
  • Frequency Range - 26Hz - 140Hz (-6dB)
  • Maximum Output - 111dB
  • Recommended Amplifier Power - 2 x 250W (500W) built-in Class-D
  • Variable Low Pass Filter - 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
  • Dimensions: - 365 x 330 x 351mm with terminal & plinth
  • Weight: 21.5kg
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