KEF Kube 8B Subwoofer

The KEF Kube 8B Subwoofer is an 8 inch sub-woofer which incorporates a 300 watt built-in amplifier for powerful low frequencies that you can hear and feel.

Each KUBE Sub-woofer is elegantly designed to match the decor of your home. The fully sealed unit unleashes explosive power effortlessly, intuitively and intelligently. KEF's iBX technology extends the bass depth dynamically, unlocking the full potential of the driver’s power at normal listening levels or even at the most extreme. The DSP amplifier analyses your input signal and applies KEF's iBX, allowing the sub-woofer to play louder and remain dynamic at any listening level.


  • 8" Woofer
  • 300 watt built-in Class D Amplifier
  • DSP preamplifier / EQ
  • 34 Hz to 140 Hz Frequency Response
  • 105 db SPL
  • Variable Low Pass Filter
  • RCA / Speaker Level Inputs
  • Colour: Black Satin
  • 5 year Warranty
  • Dimensions: 293 mm (H) x 293 mm (W) x 310 mm (D)
  • Weight: 11.3 kg