KEF Kube 12b 12 inch Subwoofer
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KEF Kube 12b 12 inch Subwoofer KEF Kube 12b 12 inch Subwoofer KEF Kube 12b 12 inch Subwoofer KEF Kube 12b 12 inch Subwoofer

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KEF Kube 12b 12 inch Subwoofer

12 Inches Bass Driver Active Subwoofer

The Kube12b is engineered to deliver the deepest bass for music and movies, if you want to feel the earth move look no further.

Perfect for creating a deep and clean rumble in large rooms. The Kube 12b has a 300 Watts Class D amplifier and a large 12 inches driver, as well as iBX technology to dynamically extend bass depth.

Special Price $1,324.00 Regular Price $1,495.00


Hear new dimensions in sound with Kube subwoofers

The Kube 12b 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.

WINNER Best Product EISA 2018/19 Awards

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.


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.



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.

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
Unit measurement Piece

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