Over 50 Years in Business

Excellent Reviews

Flexible Payment

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

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

Model: KUBE12B
SKU: 100291883


Get your delivery date

Payment Options

Pay with instalments
In Stock
Change quantity
View full details

Delivery Date


Get Your Delivery Date

Pay with instalments

Buy now, pay interest free instalments. This is a credit product. Late Payment Fees may apply with some providers. 18+ terms apply.

Pay monthly in 3 interest-free instalments. Autopay with your card. 18+ terms apply.

klarna Today



klarna 30 Days

30 Days


klarna 60 Days

60 Days


Pay every 2 weeks in 4 interest-free instalments. Autopay with your card. 18+ terms apply.



2 Weeks


4 Weeks


6 Weeks


No hidden fees. This is a credit product. 18+. Visit PayPal for T&Cs.







Additional Services


Get a quote

There is an error

Added to your cart

KEF KUBE12B 150w 12 inch Powered Subwoofer,class-d amp
You have 0 item in your cart
Cart Total: £0.00
Continue Shopping
View Cart

Key Features

2 years parts & labour

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


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.


Information From Manufacturer


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


We do not deliver to postcodes starting with


We do apologise for the inconvenience caused.