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KEF Kube 8b Gloss Black Powered Subwoofer - SP3939BC

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Abt Model: KUBE8 UPC: 637203218050
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KEF SP3939BC Kube 8b Gloss Black Powered Subwoofer

8-inch bass driver active subwoofer

Discover sound’s hidden depths with KEF Kube subwoofers. The Kube unleashes explosive power intelligently thanks to iBX technology that extends bass depth dynamically. Delivering immersive music and home theatre sounds that drive you deeper into the heart of the performance.

The Kube 8b features an 8" bass driver powered by a 300 watt RMS bespoke class D amplifier and 3 custom EQ settings for easy placement.

Key Features

  • Formidable 56bit 50 MIPS DSP preamplifier
  • iBX Intelligent Bass Extension: The DSP analyzes your input signal and applies KEF's iBX, allowing the subwoofer to play louder and remain dynmaic at any listening level
  • Sophisticated proprietary DSP programming developed by KEF's UK engineering team
  • KEF smartConnect intelligent inputs automatically detect mono or stereo and adjust the subwoofer volume level accordingly
  • Sealed for greater accuracy and delicate musical detail while allowing the Kube subwoofers to be installed in a cabinet
  • Placement tuning presets for: Free standing, Wall/in-cabinet and Corner meaning the Kube sounds perfect wherever it's installed
  • Imposing 300W Class D amplifier with DSP preamplifier/EQ



  • Hear new dimensions in sound with Kube subwoofers
    The Kube 8b effortlessly unleashes explosive power. iBX technology dynamically extends bass depth and KEF’s unique ability to design, build and integrate the driver in-house takes optimisation to a whole new level. Delivering immersive music and home theatre sound that takes you to the heart of the performance.
  • Immersiveness
    Go deep or go home. KEF’s design and engineering team worked in chorus to develop iBX. This Intelligent Bass Extension algorithm creates an extended depth that unlocks the full potential of the custom driver. Giving you unparalleled precision and ultimate synchronicity between amplifier, driver and sealed cabinet.
  • Easy configuration
    Kube subwoofers offer unmatched set up flexibility. A range of LFE, line and speaker-level inputs, phase selection and DSP controlled EQ settings help you get the best from a Kube. Put it in a convenient position, match it to any main speaker or type of music system, and start exploring new depths in the sound.


  • Integration
    KEF is quite possibly the only high-end manufacturer that designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration means we are commited to pure sound and the Kube stays true to that ideal. The result is a driver and amplifier that are perfectly in tune.
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