Kube10b Subwoofer

  • Limited offer
  • Regular price £699 / piece
Tax included.

10 inch active subwoofer

The mid-sized Kube 10b has a sealed cabinet, 10 inch bass driver and 300 Watts to produce serious extension and control.
This member of KEF's powerful range of subwoofers opens up sound’s hidden depths thanks to 300 Watts of Class D power integrated with a 10 inch driver and iBX dynamic bass extension technology.

Hear new dimensions in sound with Kube subwoofers

The Kube 10b effortlessly unleashes explosive power. iBX technology extends the bass depth dynamically 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.
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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.
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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 place, 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.

The Details


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(with Rear panel and feet / H x W x D)
370 x 353 x 370mm (14.6 x 13.9 x 14.6in.)
Powered Subwoofer (sealed)
Power Requirements
100V - 120V / 220V - 240V ~ 50 / 60Hz
Unit Measurement
Variable Low Pass Filter
40Hz - 140Hz & LFE
Frequency Response
24 to 140Hz (±3dB)
Maximum Output
Recommended Amplifier Power
300 Watts RMS
Amplifier Type
Built-in Class-D
Drive Units
1 x 250mm (10in.)
RCA phono sockets Speaker level inputs
Analogue Input
RCA phono sockets Speaker level inputs
KEF reserves the right, in line with continuing research and development, to amend or change specifications. E&OE.. * Measurement per unit


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"Effects transitions across the array are seamless, soundscapes have immersive three dimensionality, and there’s an effortless nature to its delivery that beguiles." Year: 2018 Issuing Body: AVTech Media Awards 2017/18 Country: United Kingdom Product: KEF Q Series 5.1.2 (inc. Q750, Q650c, Q350, Q50a and KUBE10b)

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"This Q Series package delivers an outstandingly cinematic and largescale presentation (with Atmos highs) from well-built speakers." Year: 2018 Issuing Body: Home Cinema Choice Country: United Kingdom Product: KEF Q Series 5.1.2 (inc. Q750, Q650c, Q350, Q50a and KUBE10b)

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Customer Reviews

Based on 3 reviews
L.G. (Camberley, GB)
Adds much needed depth to my LS50 Metas

I love it, the kids love it, wife not so much.
Looks gorgeous and kicks out nicely adding low end to my movies and games. I bought the wireless adaptor as well, this is a must purchase if you need to be flexible with placement. Deep natural bass that pulls out on Electronic and Rock music, old and new. Fear Factory sounds immense, as does the Prodigy. I am now even a fan of The Weekend.
For reference using with a pair of LS50 METAs and Naim Uniti Star.

Ruru (Swindon, GB)
Kef subwoofer

Bought for my husbands birthday. Has made a huge improvement to the surround system and a lot more base and realistic sounds. Happy husband 😁

Robert Polet (New York, US)
Functions very well

Great sound and easy to install, a perfect complement to my LS 50 wireless speakers

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