KEF KUBE12B 150w 12 inch Powered Subwoofer,class-d amp

  • Warranty 2 years parts and labour,subject to registration within 30 days of delivery

Key Features

  • Formidable 56bit 50 MIPS DSP preamplifier
  • iBX Intelligent Bass Extension
  • Sophisticated proprietary DSP programming
  • Imposing 300W Class D amp with DSP preamp/EQ

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    Special Price

    £699.00 £695.00

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    • Warranty 2 years parts and labour,subject to registration within 30 days of delivery
    • Model:KUBE12B
    • SKU:100291883

    The deep rumble in your big living room. With a large 12-inch driver, the Kube12b is the largest of the family. Delivering a deeper bass for large rooms.

    Explore new dimensions in sound with Kube, KEF’s powerful range of subwoofers that open up sound’s hidden depths.

    Each elegantly designed, fully sealed unit unleashes explosive power effortlessly, intuitively, intelligently. iBX technology extends the bass depth dynamically, unlocking the full potential of the driver’s power at normal listening levels or even the most extreme. And with KEF’s unique capability to design, build and integrate the driver in-house, we take optimisation to a whole new level. Delivering immersive music and home theatre sounds that drive you deeper into the heart of the performance.


    iBX, developed by KEF’s design and engineering team, is an Intelligent Bass Extension algorithm which creates an extended depth that unlocks the full potential of the custom driver to give you unparalleled precision and ultimate synchronicity between amplifier, driver and sealed cabinet. 

    After analysing the input signal, the DSP employs KEF's iBX algorithm which enables the subwoofer to reproduce audio at louder listening levels while maintaining its dynamic quality.

    Easy configuration

    Kube subwoofers offer unmatched flexibility in configuration. With a range of LFE, line & speaker-level inputs, Phase selection and 3 DSP controlled EQ settings to help match your sub to any room placement, you’re in control right out of the box. The Kube can be matched to any core speaker, set up to your convenience, or with any music system so you can discover new levels in your sound.


    KEF is quite possibly the only high-end manufacturer who designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration is the hallmark of their commitment to pure sound and the Kube stays true to that ideal. What you get is a driver and amplifier so perfectly attuned they sing in absolute harmony.


    After identifying whether inputs are mono or stereo, KEF's SmartConnect technology smartly tweaks the volume of the subwoofer for optimal performance. Included are placement tuning presets for Freestanding, Wall/in-cabinet and Corner meaning the Kube sounds perfect wherever it’s installed.


    Model  Kube12b
     Design Powered Subwoofer (sealed)
     Drive Units 1 x 300mm (12in.)
     Frequency Response 22Hz - 140Hz (±3dB)
     Maximum Output 114dB
     Inputs  RCA Phono sockets. Speaker level inputs
     Amplifier type Built-in Class-D
     Recommended Amplifier Power 300W RMS
     Variable low pass filter  40Hz - 140Hz & LFE
     Analogue Input RCA phono sockets Speaker level inputs
     Power requirements 100V - 120V / 220V - 240V ~ 50 / 60Hz
     Dimensions  (with Rear panel and feet / H x W x D)
    410 x 393 x 410mm (16.1 x 15.5 x 16.1in.)
     Weight 20.6kg
     Document Download Brochure
    Information Sheet
    User Manual