KEF Kube 12b Subwoofer

Our Price £689.00 RRP £750.00 Save: £61.00
The KEF Kube 12b will provide a bass response that is even greater than ever before, adding that much needed extra kick to any of your favourite music, movies or TV shows. With 3 DSP-controlled EQ settings available to you, you can even tweak the system to match your personal sound preferences for a consistently satisfying sound no matter what your tastes.

The KEF Kube 12b Subwoofer is recommended to audiophiles who want to discover even greater depths within their music, or simply want to unleash a more powerful bass response to add that extra kick to their listening experience. With iBX technology included, the Kube 12b extends the depth of its bass response dynamically, and delivers an even more immersive result when listening to music or when in use as part of a home cinema setup. Suited for most types of home theatre sound setups, the Kube 12b features a powerful 12-inch bass driver which is powered by a 300 watt RMS bespoke Class D amplifier, and the 3 custom EQ settings included on this subwoofer works to deliver a more personalized experience, tailoring your listening experience to the type of room you are in, or simply catering to personal preference.

This subwoofer has many key features in common with other models in the KEF Kube range, including the processing, circuitry, RCA phono socket inputs and the sleek, boxy design. Easy configuration of the 12b Subwoofer system is achievable through the effortless phase selection and 3 DSP controlled EQ settings. With a maximum output at 114dB, this subwoofer system uses variable low-pass filters and custom drivers. Maintaining high tonal quality, the Kube 12b subwoofer ensures momentary distortions are eliminated through minimal adjusting of gain or the AVR, resulting in an unimpeded and overall more pleasant and professional reproduction of sound.

The KEF Kube 12B subwoofer uses synchrony between the sealed cabinet, driver and amplifier; along with ease of configuration, thus ensuring you get a hassle-free experience in setting-up and using the device. Using a unique Intelligent Bass Extension algorithm, the Kube 12B harnesses greater depth in your sound via the superior custom driver implemented within. The unparalleled precision is complemented by the ease of speaker level input configuration, and an extensive range of line or LFE inputs. This will ensure you are able to create a home theatre system in which audio delivery is at par with your personal preferences.

Compact in shape, this subwoofer does not take up much space and thus can be easily added to any living room, no matter how large or small. The Kube 12b is compatible with nearly every popular speaker on the market today, and the subwoofer system has been sealed in order to consistently provide greater accuracy than ever before; this also boosts the ability to deliver delicate musical details. The 300 Watt class D amplifier with DSP preamplifier/EQ delivers grunt in a subtle, reliable manner. You can install the Kube 12b subwoofer in a cabinet, or choose from other placement options, including free-standing, walled cabinet or corner positioning.

  • Tailor to your sound preferences with the 3 DSP-controlled EQ settings
  • Compact in shape and size for greater placement flexibility
  • Adds an extra kick to the bass response
  • Sealed system for greater accuracy
  • Convenient storage options
More Information
Product Specifications



Powered Subwoofer (sealed)





1 x 300mm (12in.)





22Hz - 140Hz (±3dB)










RCA Phono sockets. Speaker level inputs





Built-in Class-D





300W RMS





40Hz - 140Hz & LFE





RCA phono sockets Speaker level inputs





100V - 120V / 220V - 240V ~ 50 / 60Hz





(with Rear panel and feet / H x W x D)

410 x 393 x 410mm (16.1 x 15.5 x 16.1in.)






EISA 2018-2019EISA 2018-2019Home Theatre Speaker System

Product Brochures

KEF Kube 12b Subwoofer Specification Sheet
Your Delivery:

Orders received before 1:00 pm* will be despatched the same day and can be delivered for next working day, (except bank holidays).  For you convenience you can choose multiple shipping options on the checkout page. We will also email with your tracking and dispatch information.

30 Day Returns Policy

HiFix is committed to selling quality products which we hope you will love, we do understand, however, that there maybe a time when you need to exchange or return something you have bought. We really do hope you are pleased with your purchase but should you wish to return anything bought from us, we will be happy to refund or exchange a product within 30 days.

NameSKUQtyLead time
KEF Kube 12b Subwoofer430043In Stock for Immediate Dispatch

Warranty information for KEF:


KEF products are designed and manufactured to the highest quality standards. However, if something does go wrong with the product we are here to help. From your date of purchase your product is warranted against faulty materials or workmanship for a period of 24 Months on Speaker Stands, 12 Months on Amplifiers, 60 Months On Speakers and 24 Months on Custom Install speakers.

This guarantee applies to all Kef Products including 5.1 home cinema speaker systems, book shelf speakers, rear speakers, award winning floor standing speakers, sound bars and sub woofers. Providing you with peace of mind and the assurance of premium Quality.

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