KEF Kube 8b

Model Kube8b Subwoofer Specs:

  • Drive Units: 1 x 200mm (8in.)
  • Frequency Range: 34Hz – 140Hz (-6dB)
  • Maximum Output: 105dB
  • Amplifier Type: Built-in Class-D
  • Amplifier Output Power: 300W RMS
  • Variable Low Pass Filter: 40Hz – 140Hz & LFE
  • Analog Input: RCA phono sockets
  • Speaker level inputs
  • Power Requirements: 00V – 120V / 220V – 240V ~ 50 / 60Hz
  • Dimensions (with Rear panel and feet / H x W x D): 293 x 293 x 310mm (11.5 x 11.5 x 12.2in.)
  • Weight: 11.3kg
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8 inch bass driver active subwoofer

Discover sound’s hidden depths with KEF Kube 8b subwoofers. The KEF Kube unleashes explosive power thanks to iBX technology.  iBZ extends bass depth. As a result, delivering music and home theatre sounds that drive you into the heart of the performance. The Kube 8b features an 8 ” bass driver. A class D 300 watt RMS amplifier powers the sub. There are 3 custom EQ settings for easy placement.


Hear new dimensions in sound with Kube subwoofers.  The Kube 8b has explosive power. iBX technology dynamically extends bass depth. KEF’s ability to design, build and integrate the driver in-house takes optimization to a whole new level. Delivering immersive music and home theatre sound that takes you to the heart of the performance.


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 precision and synchronicity between amplifier, driver and sealed cabinet.

Easy configuration

Kube subwoofers offer set up ease. A range of LFE, line and speaker-level inputs, phase selection and DSP controlled EQ settings help you get the best from a KEF Kube 8b. Firstly, put it in a convenient position. Secondly, match it to any main speaker or type of music system. Finally, start exploring new depths in the sound.



KEF is 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 committed to pure sound.  KEF Kube 8b stays true to that ideal. The result is a driver and amplifier that are perfectly in tune.

Additional information