KEF Kube 12b Subwoofer

£750.00 inc. VAT

Trade-in available

Engineered to deliver the deepest bass for music and movies, if you want to feel the earth move look no further than Kube 12b Subwoofer by KEF Audio.

Perfect for creating a deep and clean rumble in large rooms. Kube 12b features a built-in 300W Class D amplifier, a large 12-inch driver as well as KEF’s iBX technology to dynamically extend bass depth.

Available in Satin Black finish only.


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Kube 12b

Effortlessly unleashing explosive power on demand, the unique iBX technology in Kube 12b dynamically extends bass depth, delivering immersive music and home theatre sound taking you to the heart of the performance. Go deep, or go home!

KEF’s design and engineering team worked in chorus to develop iBX, an Intelligent Bass Extension algorithm which creates extended depth to unlock the full potential of the custom driver. Unparalleled precision and ultimate synchronicity between amplifier, driver and sealed cabinet.

KEF 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 your 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.

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 they remain committed to pure sound, resulting in a driver and amplifier that are perfectly in tune.


  • Design: Powered Subwoofer (sealed)
  • Power Requirements: 100V – 120V / 220V – 240V, 50 / 60Hz
  • Unit Measurement: Single Unit
  • Variable Low Pass Filter: 40Hz – 140Hz & LFE
  • Frequency Response: 22Hz – 140Hz (±3dB)
  • Maximum Output: 114dB
  • Amplifier Power: 300W RMS
  • Amplifier Type: Built-in Class-D
  • Drive Units: 1x 300mm (12in.)
  • Inputs: RCA phono sockets speaker level inputs

Q Series

KEF believes that everybody deserves great sound, hence why their Q Series range takes cutting-edge acoustic technology from other premium ranges including the Reference and Blade loudspeakers and opens them to a wider selection of people.

KEF Q Series Range | Unilet Sound & Vision

With award-winning depth and clarity, and representing exceptional value, the Q Series continues to win praise globally by unlocking detail and depth in whatever one chooses to listen to.

More Information

Additional information

Weight 20.6 kg
Dimensions 41.0 × 39.3 × 41.0 cm

Satin Black

Purchase Options

Click & Collect, Trade-In Available



Founded in 1961 by ex-BBC electrical engineer Raymond Cooke OBE, KEF was initially headquartered in a Nissen Hut on the premises of Kent Engineering & Foundry (from where the name KEF is derived), a metal-working company on the banks of the River Medway, near Maidstone in Kent.

From the very beginning, the pioneering inventiveness of KEF loudspeakers was undeniable and now for several decades, audiophiles around the world have revered KEF for their innovative, high-performance, beautiful loudspeakers.

KEF | Unilet Sound & Vision


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